CN107537493A - Co-based fischer-tropsch catalyst and its application method - Google Patents
Co-based fischer-tropsch catalyst and its application method Download PDFInfo
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Abstract
The present invention relates to a kind of co-based fischer-tropsch catalyst, preparation method and its application method, mainly solve the problems, such as that activity and selectivity is low under catalyst low temperature in synthesis gas alkene, the present invention is by using a kind of preparation of low carbon olefines by synthetic gas catalyst, in terms of catalyst weight percent, including following components：(1) 20~80% active component containing Co；(2) 20~80% nanofiber SiO2The technical scheme of carrier, preferably solves the problem, the industrial applications available for preparation of low carbon olefines by synthetic gas.
Description
Technical field
The present invention relates to a kind of co-based fischer-tropsch catalyst and its application method.
Background technology
Low-carbon alkene (alkene of carbon atom≤4) using ethene, propylene as representative is the base stock of chemical industry, mesh
Before, the primary raw material of low-carbon alkene is petroleum hydrocarbon in the world, and wherein naphtha accounts for major part, also alkane, hydrogenated diesel oil, portion
Divide mink cell focus etc..It is more using natural gas or light petroleum fraction as raw material both at home and abroad, using steam cracking work in Ethylene Complex unit
Skill produces low-carbon alkene.Steam cracking is the big power consumption device in petrochemical industry, and is completely dependent on non-renewable oil money
Source.With the increasingly shortage of petroleum resources, it is badly in need of finding alternate resources.So research with substitute gas oil producing olefinic hydrocarbons
Work is then taken seriously, and some famous oil companies and scientific research institutions have all carried out the research and development work of this respect in the world
Make, and achieve achievement attracting people's attention.Currently adjustment using energy source structure to gradually reduce the national economic development pair
Under the background of the dependence of petroleum-based energy, using the natural gas resource of China's rich reserves, pass through (the oxidation of gas making producing synthesis gas
Carbon and hydrogen mixed gas), C2~C4 alkene is then converted to, in the long term, there is very high strategic importance.
The method that synthesis gas changes into alkene includes indirect method and direct method, methanol decomposition preparing low-carbon olefins MTO techniques
With into gas via dimethyl ether preparing low-carbon olefins SDTO techniques, first by synthesis gas synthesizing methanol or dimethyl ether, then by methanol or two
Methyl ether changes into alkene.
Fischer-Tropsch (Fascher-Tropsch) synthesis is that (main component is CO and H using synthesis gas2) in the effect of catalyst
The process of lower synthesis hydrocarbon, it is an important channel of coal and natural gas indirect liquefaction.This method is nineteen twenty-three by Germany scientist
Frans Fischer and Hans Tropsch inventions, i.e. heterogeneous catalysis hydrogenation occurs on metallic catalyst for CO, raw
Into the process of the mixture based on linear paraffin and alkene.Germany has just carried out research and development in the twenties in last century, and
Industrialization was realized in 1936, is closed after World War II because can not economically be competed with petroleum industry；South Africa possesses abundant
Coal resources, but petroleum resources plaque is weary, and limited for a long time by international community's economy and political sanction, force its Development of Coal system
Oily industrial technology, and built up coal base F-T artificial oil factory of the First production capacity for 25~400,000 tons of product/years in 1955
(Sasol-1).The world oil crisis twice of 1973 and 1979, cause world's crude oil price to fall and swing fluctuating, rise greatly greatly
Fall, based on the consideration of Strategic Technology deposit, F-T synthetic technologys arouse the interest of industrialized country again.1980 and nineteen eighty-two,
South Africa Sasol companies build up in succession again and Liang Zuomeiji artificial oils factory of having gone into operation.But plummeting for World oil price in 1986, is pushed away
Late F-T synthetic technologys are in other national heavy industrialization processes.Since twentieth century nineties, petroleum resources are increasingly short
Scarce and in poor quality, while coal and natural gas proved reserves are but continuously increased, fischer-tropsch technologies cause extensive concern, Fischer-Tropsch again
Synthetic technology has also obtained significant progress.Currently used fischer-tropsch catalysts, from active component for be divided into two major classes：Iron
Base catalyst and cobalt-base catalyst；And common synthesis technique is divided into two major classes if classifying from synthesis condition angle：High temperature
Fischer-tropsch synthesis process and Low Temperature Fischer Tropsch synthesis technique；It is big that synthesis technique is divided into three if classifying from used reactor difference
Class：Fixed bed fischer-tropsch synthesis process, fluid bed fischer-tropsch synthesis process (have the recirculating fluidized bed of early stage and later ciculation fluidized
Developed on the basis of bed fixed fluidized bed) and syrup state bed Fischer Tropsch synthesis technique.Fixed bed therein and slurry bed system are general
Applied to low temperature fischer-tropsch process, it is used for the production of mink cell focus and wax, and fluid bed is then more suitable for production more lightweight
The high temperature fischer-tropsch technique of hydro carbons.
The purpose of present carbon-chemical synthesis hydro carbons is to be translated into the low-carbon alkene as basic chemical raw materials, its
Middle ethene and propylene are the materials of current most worthy.Moreover, generated by the direct preparing low-carbon olefins of synthesis gas for single step reaction
Purpose product, its technological process is simpler than indirect method, and economic evaluation is also more worthwhile.Last decade, directly synthesized by synthesis gas
Low-carbon alkene starts to cause concern.
Nano wire is a kind of line of nanoscale, that is, is limited in the one-dimentional structure of nano-scale in the horizontal.This
On kind yardstick, quantum mechanical effects are critically important, therefore also referred to as " quantum wire ".According to the difference of composition material, nano wire can
It is divided into different types, including metal nanometer line is (such as：Ni, Pt, Au etc.), semiconductor nanowires are (such as：InP, Si, GaN etc.) and
Insulator nano wire is (such as：SiO2, TiO2 etc.) and other biomass nano lines.(Yi Cui,Qingqiao Wei,Hongkun
Park,Charles M.Science.,2001,293(5533)：1289) nano wire has super large surface, highly tough
Property, during applied to catalytic reaction, there is big catalytic Contact surface, more preferable wearability.
One-dimensional silicon oxide nanofiber has the spies such as high-insulativity, good fluorescent effect, high surface area, surface-active
Property, have in fields such as the assembling of micro-nano device, nano-array research, nanocomposite optical transmission, the high insulaion resistances of nanometer very big
Application potential, while as a kind of emerging nano material, one-dimensional silica white nano-wire is in traditional Industrial Catalysis, macromolecule material
Material reinforcement, cosmetics are brightened and also held out broad prospects with fields such as antiultraviolets.Therefore, the synthesis side of one-dimensional silica white nano-wire
Method research is a study hotspot of Material Field in recent years.
At present, the preparation method of 1-dimention nano silicon oxide fibre mainly has a physical method and chemical method, and Physical is main
For laser ablation (Laser Ablation Method) (D.P.Yu, Q.L.Hang, Y.Ding, Appl.Phys.Lett.,
1998,73:3076).Laser ablation is that silicon, silica and iron catalyst are mixed and made into target by a certain percentage, then high again
Under temperature, laser-induced thermal etching growing silicon oxide nano wire is utilized.The method temperature is high, and condition is harsh, is not suitable for large-scale industrial production.
Chemical method mainly includes：High temeperature chemistry sedimentation, sol-gel process and auxiliary agent help growth method etc..Chemistry immerses method and used extensively
In the preparation of CNT, at high temperature, mixed using gas mixing silicon source with metallic catalyst, then cool down condensation, in metal
In the presence of catalyst, nano wire is generated, the method needs also exist for high temperature, and condition is harsh.It is to help growth that auxiliary agent, which helps growth method,
Nano wire is generated under the conditions of agent is existing.Such as in the presence of carbon, high―temperature nuclei nano silicon oxide line (S.-H.Li, X.-
F.Zhu, Y.-P.Zhao, J.Phys.Chem.B, 2004,108：17032)；CN101798089A then using germanium as catalyst,
Under ultrahigh vacuum and hot conditions, silica white nano-wire is prepared for, condition is harsh, it is difficult to amplifies.Sol-gel process is to use
Template forms nano pore, and as templated synthesis silica white nano-wire, sol-gel process needs to consume substantial amounts of template
Agent, cost are high and not environmentally.The present invention provides a kind of hydrothermal synthesis method, and preparation process is simple, and consumption is few, is easy to amplify.
Synthesis gas is converted into by low-carbon alkene by F- T synthesis, except by reaction process condition and thermodynamics and dynamic
The influence of terms of mechanics, catalyst are then one of vital influence factors.Nineteen twenty-three Germany scientist Franz Fisher
The reaction of syngas catalytic conversion hydro carbons is found that with Hans Tropsch, therefore, the side of hydro carbons is prepared by synthesis gas reaction
Method is referred to as Fiscber-Tropscb synthesis (Fischer-Tropsch is synthesized, abbreviation F-T synthesis) method, i.e., with CO and H2Reaction hydro carbons processed, by-product
Water and CO2.Nineteen fifty-five South Africa SASOL (South Africa Coal and Gas Corporation) has been built up using coal as original
Material large-scale fixed bed F-T synthesizers, then developed circulating fluidized bed technique, recently again develop it is fixed fluidized bed and
Slurry bed technique.Nowadays, SASOL coal year disposal ability has reached 50,000,000, and the annual capacity of oil product and chemicals reaches
7600000 tons.Past F-T synthesis reaction the purpose is to by synthesis gas synthetic fuel liquefied hydrocarbon, although fluidization,
The use of ferrum-based catalyst and the addition of auxiliary agent, the yield of low-carbon alkene (C2-C4 alkene), but low-carbon are improved to a certain extent
Olefin yields are not still high, only 20-25%.
Mainly had by preparing low-carbon olefin catalyst system and catalyzing at present following several.(1) F-T catalyst Dent etc. is improved
People has found that cobalt-base catalyst can be used for the synthesizing low-carbon alkene of high selectivity, such as：Co-Cu/Al2O3、Co-Fe/SiO2、Fe-Co/
C、Co-Ni/MnO2, the system such as Fe-Co alloy/C.The improvement FT catalyst results wherein developed with Rule chemical company are preferable,
Fe-ZnO-K2The components such as Mn or Ti are added on O catalyst, using high gas circulation, reach CO conversion ratios 80%, low-carbon alkene
Selectivity 70%；(2) Ultra-fine Particle Catalysts Venter etc. has obtained the high score of Activated Carbon Supported by carbonyl complex decomposition method
Dissipate K-Fe-Mn catalyst, catalyst has a very high activity, C in product2-C4Alkene accounts for 85-90%, and methane is to detect only
One other products.Cupta et al. prepares the Fe with catalytic activity using laser pyrolysis processesxSiyCzIt is Deng powder CO conversion ratios
40%, C2 =-C4 =Selectivity reaches 87%, only a small amount of methane.Bright et al. the drop using organic salt complex of Shanxi coalification institute clock
Solution is successfully developed and develops ultrafine particle Fe/Mn catalyst that is new, having practical background, and CO conversion ratios are more than 95%, C2 =-C4 =/C2-C4More than 80%.Beijing University of Chemical Technology Zhang Jingchang prepares high degree of dispersion amorphous superfine iron powder using laser pyrolysis processes
And carbon dust, F-T synthesizing activity new species Fe is successfully made through solid phase reaction3C.Prepare with Fe3C is the Fe-C, Fe- of main body
The nanocatalysts such as C-Mn, Fe-C-Mn-K, CO conversion ratios are up to 90%, and olefine selective is up to more than 80%；(3) amorphous state synthesizes
Catalyst Yokoyama et al. uses amorphous state Fe40Ni40P16B4Compound, CO conversion ratios 50%, C2-C5Hydrocarbon-selective is
65%, and crystalline-state catalyst mainly generates methane；(4) zeolite catalyst, which represents system, the catalyst such as Co-A, Co-Y, Fe-Y,
The iron catalyst for the high dispersive that zeolite supports is made in Ballivet-Tketchenko et al., and selectivity of light olefin is at a relatively high,
88-98% is in C2-C4In the range of, other are such as iron catalyst that ZSM-5, mercerising, 13X zeolites support also shows that similar behavior.But
These catalyst run into different degrees of difficulty in the programs such as Repeatability, amplification preparation are prepared.
The content of the invention
Present invention solves the technical problem that one of be preparation of low carbon olefines by synthetic gas (C2-C4 alkene) catalyst in the prior art
The problem of activity and selectivity is low under low temperature, there is provided a kind of preparation of low carbon olefines by synthetic gas catalyst, the catalyst are used for synthesis gas
Producing light olefins, there is preferable low temperature active and selectivity of light olefin.Present invention solves the technical problem that two be to provide
It is a kind of with solving the preparation method of the corresponding catalyst of one of technical problem.
To solve one of above-mentioned technical problem, the technical solution adopted by the present invention is as follows：A kind of co-based fischer-tropsch catalyst, with
Catalyst weight percent meter, including following components：
(1) 20~80% active component containing Co；
(2) 20~80% nanofiber SiO2Carrier.
In above-mentioned technical proposal, it is preferred that nanofiber SiO2A diameter of 10-500 nanometers of carrier；It is furthermore preferred that receive
Rice fiber SiO2A diameter of 20-200 nanometers of carrier.
In above-mentioned technical proposal, it is preferred that nanofiber SiO2The preparation method of carrier, comprises the following steps：With iron,
At least one of cobalt, nickel and zinc metal or oxide are catalyst I, in the presence of organic amine and water, silica through hydrothermal conversion,
Dry, nanofiber silica is made after roasting.
In above-mentioned technical proposal, it is preferred that silica in Ludox, amorphous or crystalline silica at least one
Kind.
In above-mentioned technical proposal, it is preferred that the percentage by weight of catalyst I is 0.5-30% in silica；In silica
The percentage by weight of catalyst I is 0.5-5%.
In above-mentioned technical proposal, it is preferred that the weight of organic amine and water ratio is (0.5-20)：1.
In above-mentioned technical proposal, it is preferred that hydrothermal conversion temperature is 150-250 DEG C.
In above-mentioned technical proposal, it is preferred that the hydrothermal conversion time is 12-96 hours；It is furthermore preferred that the hydrothermal conversion time is
48-72 hours.
In above-mentioned technical proposal, it is preferred that the active component containing Co can be by following general formula with atomic ratio measuring：
Co100AaBbOx
Wherein A is selected from least one of Mn or Cu；
B is selected from least one of W or Mo；
A span is：0~200；
B span is：0~150；
X is to meet the oxygen atom sum needed for other element valences.
In above-mentioned technical proposal, it is preferred that a span is 5~150；It is furthermore preferred that a span be 20~
150。
In above-mentioned technical proposal, it is preferred that b span is 5~50；Preferably, B is selected from W and Mo；It is furthermore preferred that W
Ratio with Mo is 1~2.
To solve the two of above-mentioned technical problem, the technical solution adopted by the present invention is as follows：The preparation method of catalyst includes
Following steps：
(1) soluble-salt containing component Co, A is dissolved in deionized water wiring solution-forming I；
(2) soluble-salt containing component B is dissolved in deionized water wiring solution-forming II；
(3) solution II is added and mixture I is formed in solution I；
(4) by nanofiber SiO2Carrier adds mixture I, and mixtures II is made；
(5) pH value of mixtures II is adjusted with alkali to 8~10, slurry is made in heating concentration；
(6) slurry drying obtains catalyst precursor；
(7) the fired obtained catalyst of catalyst precursor.
In above-mentioned technical proposal, it is preferred that the slurry solid content of gained is 60~80 weight % after step (5) concentration；Step
Suddenly (6) drying temperature is 70~90 DEG C, and drying time is 5~40 hours；Step (7) sintering temperature is 500~800 DEG C, roasting
Time is 2~12 hours.
The application method of above-mentioned catalyst is as follows：A kind of method of preparation of low carbon olefines by synthetic gas, reaction temperature be 220~
280 DEG C, reaction pressure is 0.5~2.5MPa, volume space velocity 1000-4000h-1Under conditions of, synthesis gas and above-mentioned catalyst
Haptoreaction generates low-carbon alkene.
The present invention uses nanofiber SiO2As carrier, there is open gap structure, low-carbon alkene product can be made fast
Speed diffuses out catalyst granules, and the secondary response of low-carbon alkene can be greatly decreased, moreover, nanofiber SiO2One wiener of carrier
Rice characteristic, the scattered of active component can be promoted, product is moved to low-carbon direction.By adding various effective auxiliary agents, strengthen one
The adsorption activation of carbonoxide and hydrogen, promote Co reduction, higher active and low-carbon alkene can be kept under relatively low reaction temperature
Hydrocarbon-selective, it is avoided that carbon distribution problem during reaction at high temperature.Particularly when adding VI A races oxide in catalyst, more can
Promote the scattered of active component oxide, and during catalyst reduction, can preferably fix active component, be allowed to keep
Good decentralization.
Using the catalyst for preparing of the present invention, at 250-350 DEG C, 0.5-2.5MPa, volume space velocity 1000-4000h-1Bar
Reacted under part, CO conversion ratios>80%, C2-C4Olefine selective>55%, achieve preferable technique effect.
Below by embodiment, the present invention is further elaborated.
Brief description of the drawings
Fig. 1 is the SEM spectrograms of nanofiber silica
Embodiment
【Embodiment 1】
150 grams of methylamines, 350 grams of propylamine and 1000 grams of deionized waters are weighed, solution is mixed into and adds in reactor, then weigh
500 grams of the silica containing 0.25% iron oxide and 0.25% zinc oxide, add in reactor, sealing is warming up to 160 DEG C, reaction
Room temperature is down to after 24 hours, is dried 5 hours at 100 DEG C after solid filtering, then 12 hours obtained nanofiber oxygen is calcined at 400 DEG C
SiClx, its SEM spectrogram are shown in Fig. 1.
【Embodiment 2】
Weigh 2000 grams of ethylenediamines and 1000 grams of deionized waters, be mixed into solution add reactor in, then weigh containing
100 grams of the silica of 15% iron oxide, adding in reactor, sealing is warming up to 170 DEG C, and reaction is down to room temperature after 12 hours, Gu
Dried 24 hours at 80 DEG C after body filtering, then 8 hours obtained silicon oxide fibres are calcined at 500 DEG C.
【Embodiment 3】
300 grams of ethamine, 770 grams of butylamine, 1700 grams of triethylamines and 230 grams of deionized waters are weighed, solution is mixed into and adds instead
Answer in kettle, then weigh 60 grams of the silica containing 0.6% iron oxide and 2.4% zinc oxide, add in reactor, sealing is warming up to
250 DEG C, room temperature is down in reaction after 72 hours, dried 2 hours at 120 DEG C after solid filtering, then is made within 1 hour in 800 DEG C of roastings
Silicon oxide fibre.
【Embodiment 4】
Take 127.7 grams of cobalt nitrate hexahydrates to be dissolved in 100 milliliters of water and be made into certain density solution I, 70 grams of embodiments 1 are made
Standby obtained nanofiber SiO2Add solution I and obtain mixture II with ammoniacal liquor regulation pH value to 8, mixture II is placed in boiling
Heating is concentrated into the weight % of solid content 55 and obtains slurry in water-bath, and slurry is done at 90 DEG C with the hot-air that relative humidity is 90%
Obtain catalyst precursor within dry 5 hours, catalyst precursor is calcined 5 hours obtained catalyst at 650 DEG C, consisting of：
30%Co100Ox+70% nanofibers SiO2.Catalyst crushing and screening 20-40 mesh particles are stand-by.Catalyst is in reaction temperature 250
DEG C, reaction pressure 1.0Mpa, reaction velocity 2000h-1Condition evaluating, evaluation result is shown in Table 1.
【Embodiment 5】
Take 60.3 grams of cobalt nitrate hexahydrates to be dissolved in 100 milliliters of water and be made into certain density solution I, 17.3 grams of ammonium tungstates are molten
Solution obtains solution II in 100 milliliters of water, and solution II is added in solution I and obtains mixture I, and 70 grams of embodiments 1 are prepared into
The nanofiber SiO arrived2Add mixture I and obtain mixture II with ammoniacal liquor regulation pH value to 8, mixture II is placed in boiling water
Heating is concentrated into the weight % of solid content 55 and obtains slurry in bath, and slurry is dried at 80 DEG C with the hot-air that relative humidity is 90%
Obtain catalyst precursor within 12 hours, catalyst precursor is calcined 3 hours obtained catalyst at 750 DEG C, consisting of：70%
Co100W40Ox+30% nanofibers SiO2.Catalyst crushing and screening 20-40 mesh particles are stand-by.Catalyst is in reaction temperature 250
DEG C, reaction pressure 1.0Mpa, reaction velocity 2000h-1Condition evaluating, evaluation result is shown in Table 1.
【Embodiment 6】
72.5 grams of cobalt nitrate hexahydrates and 58.9 gram of 50% manganese nitrate is taken to be dissolved in 100 milliliters of water and be made into certain density solution
I, the nanofiber SiO that 70 grams of embodiments 1 are prepared2Add solution I and obtain mixture with ammoniacal liquor regulation pH value to 8
II, mixture II is placed in boiling water bath heating it is concentrated into the weight % of solid content 55 and obtain slurry, slurry at 80 DEG C with relative
The hot-air that humidity is 90%, which is dried 12 hours, obtains catalyst precursor, and catalyst precursor is made for 3 hours in 750 DEG C of roastings
Catalyst is obtained, consisting of：30%Co100Mn80Ox+70% nanofibers SiO2.Catalyst crushing and screening 20-40 mesh particles are treated
With.Catalyst is in 250 DEG C, reaction pressure 1.0Mpa, reaction velocity 2000h of reaction temperature-1Condition evaluating, evaluation result is shown in Table
1。
【Embodiment 7】
Take 67 grams of cobalt nitrate hexahydrates to be dissolved in 100 milliliters of water and be made into certain density solution I, by 9.6 grams of ammonium tungstates and 6.7
Gram ammonium molybdate, which is dissolved in 100 milliliters of water, obtains solution II, and solution II is added in solution I and obtains mixture I, by 70 grams of implementations
The nanofiber SiO that example 1 is prepared2Add mixture I and obtain mixture II with ammoniacal liquor regulation pH value to 8, by mixture
II, which is placed in boiling water bath heating, is concentrated into the weight % of solid content 55 and obtains slurry, at 80 DEG C is 90% with relative humidity slurry
Hot-air is dried 12 hours and obtains catalyst precursor, and catalyst precursor is calcined into 3 hours obtained catalyst at 750 DEG C, its
Form and be：30%Co100W20Mo20Ox+70% nanofibers SiO2.Catalyst crushing and screening 20-40 mesh particles are stand-by.Catalyst
In 250 DEG C, reaction pressure 1.0Mpa, reaction velocity 2000h of reaction temperature-1Condition evaluating, evaluation result is shown in Table 1.
【Embodiment 8】
50.2 grams of cobalt nitrate hexahydrates and 2.8 grams of nitrate trihydrate copper are taken to be dissolved in 100 milliliters of water and be made into certain density solution
I, 14.4 grams of ammonium tungstates and 5 grams of ammonium molybdates are dissolved in 100 milliliters of water and obtain solution II, solution II is added in solution I and obtained
To mixture I, the nanofiber SiO that 70 grams of embodiments 1 are prepared2Add mixture I and obtained with ammoniacal liquor regulation pH value to 8
To mixture II, mixture II is placed in heating in boiling water bath it is concentrated into the weight % of solid content 55 and obtain slurry, slurry 80
DEG C dried with the hot-air that relative humidity is 90% and to obtain catalyst precursor in 12 hours, by catalyst precursor in 750 DEG C of roastings
3 hours obtained catalyst are burnt, consisting of：30%Co100Cu8W40Mo20Ox+70% nanofibers SiO2.Catalyst crushing and screening
20-40 mesh particles are stand-by.
Catalyst is in 250 DEG C, reaction pressure 1.0Mpa, reaction velocity 2000h of reaction temperature-1Condition evaluating, evaluation knot
Fruit is shown in Table 1.
【Embodiment 9】
Take 128.2 grams of cobalt nitrate hexahydrates, 26 gram of 50% manganese nitrate and 7 grams of nitrate trihydrate copper to be dissolved in 100 milliliters of water to be made into
Certain density solution I, 51.3 grams of ammonium molybdates are dissolved in 100 milliliters of water and obtain solution II, solution II is added in solution I
Mixture I is obtained, the nanofiber SiO that 20 grams of embodiments 1 are prepared2Add mixture I and adjust pH value to 8 with ammoniacal liquor
Mixture II is obtained, mixture II is placed in boiling water bath heating is concentrated into the weight % of solid content 55 and obtain slurry, slurry is existed
Dried 12 hours with the hot-air that relative humidity is 90% for 80 DEG C and obtain catalyst precursor, by catalyst precursor at 750 DEG C
3 hours obtained catalyst are calcined, consisting of：80%Co100Cu8Mn20Mo80Ox+20% nanofibers SiO2.Catalyst crushes
It is stand-by to screen 20-40 mesh particles.Catalyst is in 250 DEG C, reaction pressure 1.0Mpa, reaction velocity 2000h of reaction temperature-1Condition
Evaluation, evaluation result are shown in Table 1.
【Embodiment 10】
Take 69.6 grams of cobalt nitrate hexahydrates, 105.9 gram of 50% manganese nitrate, 0.4 gram of potassium nitrate and 23.8 grams of nitrate trihydrate copper molten
Certain density solution I is made into 100 milliliters of water, 2.5 grams of ammonium tungstates are dissolved in 100 milliliters of water and obtain solution II, will
Solution II adds in solution I and obtains mixture I, the nanofiber SiO that 50 grams of embodiments 1 are prepared2Add mixture I simultaneously
Mixture II is obtained with ammoniacal liquor regulation pH value to 8, mixture II is placed in into heating in boiling water bath is concentrated into the weight % of solid content 55
Slurry is obtained, slurry is dried 12 hours at 80 DEG C with the hot-air that relative humidity is 90% and obtains catalyst precursor, will be urged
Agent presoma is calcined 3 hours obtained catalyst at 750 DEG C, consisting of：50%Co100Cu50Mn150W5K2Ox+50% nanometers
Fiber SiO2.Catalyst crushing and screening 20-40 mesh particles are stand-by.Catalyst in 250 DEG C, reaction pressure 1.0Mpa of reaction temperature,
Reaction velocity 2000h-1Condition evaluating, evaluation result is shown in Table 1
【Embodiment 11】
15 grams of cobalt nitrate hexahydrates and 5.1 grams of nitrate trihydrate copper are taken to be dissolved in 100 milliliters of water and be made into certain density solution I,
16.2 grams of ammonium tungstates are dissolved in 100 milliliters of water and obtain solution II, solution II is added in solution I and obtains mixture I, by 80
The nanofiber SiO that gram embodiment 1 is prepared2Add mixture I and obtain mixture II with ammoniacal liquor regulation pH value to 8, will
Mixture II, which is placed in boiling water bath heating and is concentrated into the weight % of solid content 55, obtains slurry, is with relative humidity at 80 DEG C slurry
90% hot-air is dried 12 hours and obtains catalyst precursor, and in 750 DEG C of roastings catalyst precursor was made into catalysis in 3 hours
Agent, consisting of：20%Co100W150Cu50Ox+ 80% nanofiber SiO2.Catalyst crushing and screening 20-40 mesh particles are stand-by.
Catalyst is in 250 DEG C, reaction pressure 1.0Mpa, reaction velocity 2000h of reaction temperature-1Condition evaluating, evaluation result is shown in Table 1
【Embodiment 12】
93.6 grams of cobalt nitrate hexahydrates and 189 gram of 50% manganese nitrate is taken to be dissolved in 100 milliliters of water and be made into certain density solution
I, 6.7 grams of ammonium tungstates are dissolved in 100 milliliters of water and obtain solution II, solution II is added in solution I and obtains mixture I, will
The nanofiber SiO that 30 grams of embodiments 1 are prepared2Add mixture I and obtain mixture II with ammoniacal liquor regulation pH value to 8,
Mixture II is placed in boiling water bath heating it is concentrated into the weight % of solid content 55 and obtain slurry, slurry at 80 DEG C with relative humidity
Catalyst precursor is obtained for 90% hot-air drying within 12 hours, and catalyst precursor is made for 3 hours in 750 DEG C of roastings and urged
Agent, consisting of：70%Co100W10Mn200Ox+ 30% nanofiber SiO2.Catalyst crushing and screening 20-40 mesh particles are treated
With.Catalyst is in 250 DEG C, reaction pressure 1.0Mpa, reaction velocity 2000h of reaction temperature-1Condition evaluating, evaluation result is shown in Table
1
【Comparative example 1】
Take 127.7 grams of cobalt nitrate hexahydrates to be dissolved in 100 milliliters of water and be made into certain density solution I, by 70 grams of SiO2Add
Solution I simultaneously obtains mixture II with ammoniacal liquor regulation pH value to 8, and mixture II is placed in into heating in boiling water bath is concentrated into solid content 55
Weight % obtains slurry, and slurry is dried 5 hours at 90 DEG C with the hot-air that relative humidity is 90% and obtains catalyst precursor,
Catalyst precursor is calcined 5 hours obtained catalyst at 650 DEG C, consisting of：30%Co100Ox+70%SiO2.Catalyst
Crushing and screening 20-40 mesh particles are stand-by.Catalyst is in 250 DEG C, reaction pressure 1.0Mpa, reaction velocity 2000h of reaction temperature-1's
Condition evaluating, evaluation result are shown in Table 1.
【Comparative example 2】
Take 127.7 grams of cobalt nitrate hexahydrates to be dissolved in 100 milliliters of water and be made into certain density solution I, by 70 grams of α-Al2O3Add
Enter solution I and obtain mixture II with ammoniacal liquor regulation pH value to 8, mixture II is placed in into heating in boiling water bath is concentrated into solid content
55 weight % obtain slurry, and slurry is dried 5 hours at 90 DEG C with the hot-air that relative humidity is 90% and obtains complex catalyst precursor
Body, catalyst precursor is calcined 5 hours obtained catalyst at 650 DEG C, consisting of：30%Co100Ox+70% α-Al2O3.Urge
Agent crushing and screening 20-40 mesh particles are stand-by.Catalyst is in 250 DEG C, reaction pressure 1.0Mpa of reaction temperature, reaction velocity
2000h-1Condition evaluating, evaluation result is shown in Table 1.
【Comparative example 3】
150 grams of methylamines, 350 grams of propylamine and 1000 grams of deionized waters are weighed, solution is mixed into and adds in reactor, then weigh
500 grams of silica containing 0.5% cupric oxide, add in reactor, sealing is warming up to 160 DEG C, and reaction is down to room after 24 hours
Temperature, dried 5 hours at 100 DEG C after solid filtering, then the silica (SiO after processing is made in 12 hours in 400 DEG C of roastings2-
treated)。
Take 127.7 grams of cobalt nitrate hexahydrates to be dissolved in 100 milliliters of water and be made into certain density solution I, by 70 grams of SiO2-
Treated, which adds solution I and simultaneously adjusts pH value with ammoniacal liquor, obtains mixture II to 8, mixture II is placed in boiling water bath heat it is dense
It is reduced to the weight % of solid content 55 and obtains slurry, slurry is dried 5 hours at 90 DEG C with the hot-air that relative humidity is 90% and obtained
Catalyst precursor, catalyst precursor is calcined 5 hours obtained catalyst at 650 DEG C, consisting of：30%Co100Ox+
70%SiO2-treated.Catalyst crushing and screening 20-40 mesh particles are stand-by.Catalyst is in 250 DEG C of reaction temperature, reaction pressure
1.0Mpa, reaction velocity 2000h-1Condition evaluating, evaluation result is shown in Table 1.
【Comparative example 4】
Take 127.7 grams of cobalt nitrate hexahydrates to be dissolved in 100 milliliters of water and be made into certain density solution I, it is nano oxidized by 70 grams
Silicon (Nano-SiO2) add solution I and obtain mixture II with ammoniacal liquor regulation pH value to 8, mixture II is placed in boiling water bath
Heating is concentrated into the weight % of solid content 55 and obtains slurry, and slurry is small with the hot-air drying 5 that relative humidity is 90% at 90 DEG C
When obtain catalyst precursor, by catalyst precursor 650 DEG C be calcined 5 hours obtained catalyst, consisting of：30%
Co100Ox+70%Nano-SiO2.Catalyst crushing and screening 20-40 mesh particles are stand-by.Catalyst is in 250 DEG C of reaction temperature, reaction
Pressure 1.0Mpa, reaction velocity 2000h-1Condition evaluating, evaluation result is shown in Table 1.
【Embodiment 13-18】
The catalyst that Example 4 is prepared, appreciation condition and evaluation result are shown in Table 2.
Table 1
Table 2
Claims (10)
1. a kind of co-based fischer-tropsch catalyst, in terms of catalyst weight percent, including following components：
(1) 20~80% active component containing Co；
(2) 20~80% nanofiber SiO2Carrier.
2. according to co-based fischer-tropsch catalyst described in claims 1, it is characterised in that nanofiber SiO2A diameter of 10- of carrier
500 nanometers.
3. according to co-based fischer-tropsch catalyst described in claims 1, it is characterised in that nanofiber SiO2A diameter of 20- of carrier
200 nanometers.
4. according to co-based fischer-tropsch catalyst described in claims 1, it is characterised in that nanofiber SiO2The preparation method of carrier,
Comprise the following steps：Using at least one of iron, cobalt, nickel and zinc metal or oxide as catalyst I, exist in organic amine and water
Under, nanofiber silica is made in silica after hydrothermal conversion, drying, roasting.
5. according to co-based fischer-tropsch catalyst described in claims 4, it is characterised in that the percentage by weight of catalyst I in silica
For 0.5-30%.
6. according to co-based fischer-tropsch catalyst described in claims 4, it is characterised in that the weight of organic amine and water ratio is (0.5-
20)：1.
7. according to co-based fischer-tropsch catalyst described in claims 4, it is characterised in that hydrothermal conversion temperature is 150-250 DEG C.
8. according to co-based fischer-tropsch catalyst described in claims 4, it is characterised in that the hydrothermal conversion time is 12-96 hours.
9. according to co-based fischer-tropsch catalyst described in claims 1, it is characterised in that the active component containing Co can with atomic ratio measuring
By following general formula：Co100AaBbOx
Wherein A is selected from least one of Mn or Cu；
B is selected from least one of W or Mo；
A span is：0~200；
B span is：0~150；
X is to meet the oxygen atom sum needed for other element valences.
10. it is 220~280 DEG C in reaction temperature a kind of method of preparation of low carbon olefines by synthetic gas, reaction pressure is 0.5~
2.5MPa, volume space velocity 1000-4000h-1Under conditions of, synthesis gas contacts with the catalyst described in any one of claim 1~8
Reaction generation low-carbon alkene.
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