CN104162454B - Multiple dimensioned reaction carriers with porous MCA and preparation method thereof - Google Patents
Multiple dimensioned reaction carriers with porous MCA and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of multiple dimensioned reaction carriers with porous MCA and preparation method thereof.On rectangular slab, the microchannel that many row's parallel interval are uniform is had using rectangular slab as reaction carriers, the cross section of microchannel is inverted trapezoidal, in microchannel, three surfaces all have equally distributed micropore, micropore inside is rough surface, is formed the multiple dimensioned reaction carriers of microcosmic-Jie's sight-macroscopic view by micropore, microchannel and reaction carriers; Adopt surperficial sintering and dissolution process, successively through abrasive dust, paving powder, cold pressing, multiple dimensioned reaction carriers that hot pressing, dissolved salt, processing obtain being with porous MCA.The present invention can realize the one-shot forming manufacture of multiple dimensioned composite construction, effectively improves the specific area of microreactor and the bond area of catalyst, is conducive to the attachment of catalyst and efficiently carrying out of reaction.Preparation method is simple, with low cost, can be applied in the reactions such as methyl alcohol steam reformation hydrogen production, effectively improve reaction efficiency, and reduce the volume and weight of reactor.
Description
Technical field
The present invention relates to a kind of reaction carriers and preparation method thereof, especially a kind of multiple dimensioned reaction carriers with porous MCA and preparation method thereof.
Background technology
Along with the raising of socioeconomic development and the size of population, the energy is just consumed with more and more faster speed, current, and research and development of new sources of energy has become a worldwide difficult problem and focus.Hydrogen Energy and fuel cell, as 21 century clean energy utilization technology efficiently, have become one of global study hotspot.Hydrogen Energy is a kind of very superior new forms of energy, and its major advantage has: combustion heat value is high, and combustion product is pollution-free, hydrogen manufacturing aboundresources.The advantages such as hydrogen fuel cell is high with its efficiency, convenient and reliable, obtain and greatly develop; At present, the transport of pure hydrogen, storage and loading technique and facility can not meet dispersed hydrogen station and especially enter the requirement that family uses, therefore by the accumulating filling facility of existing fossil fuel, and utilize fuel reforming hydrogen manufacturing for one mode efficiently, conveniently and efficiently.
At present, alcohols self-heating reforming hydrogen manufacturing is an important development direction of alcohols hydrogen manufacturing.It is the burning by the fuel such as alcohols or hydrogen, for alcohols steam reforming provides enough heats, to realize alcohols self-heating reforming hydrogen manufacturing.In the gaseous product that alcohols steam reforming obtains, hydrogen content is high, carbon monoxide content low (carbon monoxide can make the anode poison deactivation of hydrogen fuel cell), thus improve the transformation efficiency of alcohols and the energy density of alcohols reactor, and reduce the removal difficulty of carbon monoxide.
In the last few years, a lot of relevant units of countries in the world had carried out the research to self-heating type reformation hydrogen production reaction mechanism.The area of catalyst degree of adhesion and chemical reaction is two essential condition improving course of reaction, by improving the real reaction area of catalyst attachment and chemical reaction, thus the better reactor of design performance.Meanwhile, the machinability, cost height, complexity etc. of microreactor design are also the factors needing to consider.Therefore, better, the microreactor structure that is easy to process, can be mass and be easy to catalyst attachment of design performance and manufacture method are the importances of self-heating type hydrogen manufacturing microreaction technology.
Chinese invention patent (application number 200610104598.4) discloses a kind of metal foam catalytic reforming reactor.This reactor adopts sleeve structure, metal foam is provided with as catalyst carrier between sleeve pipe, the heat of outer catalytic combustion release, the metal foam be delivered in the middle of interior pipe carries out catalytic reforming, high-efficiency cleaning ground hydrogen making, but employing tubular structure, not easily expands reaction scale, and heat transference efficiency is low.
Chinese invention patent (application number 200610124078.X) discloses a kind of oriented copper fiber sintering felt serving and the manufacture method thereof that are used as catalyst carrier, manufactured copper fiber, and it is wrapped in corrosion resistant plate groove according to certain rule, cover with alumina powder after compression, at high temperature sinter subsequently, obtain oriented copper fiber sintering felt serving.The reaction carriers thermal conductance that the method produces is bad, is unfavorable for the stacked expansion of reaction carriers.
Chinese invention patent (application number 201310554712.3) discloses a kind of self-heating mistake row micro-boss array type alcohol reforming device, comprise reformation hydrogen production plate and catalytic combustion plate, for carrying out alcohols burning and steam reforming hydrogen production reaction, realize self-heating to run, but the catalyst of area load easily comes off, cause the reduction of reaction rate and the decline of alcohols conversion ratio.
The hydrogen produced in alcohol reforming hydrogen production microreactor, can directly apply in a fuel cell, and the integrated fast development that can realize dispersed fuel cell or removable hydrogen source of minisize hydrogen source and DMFC.Along with popularizing of small household appliance, the micro battery system of corresponding clean and effective inherently obtains to be greatly developed, and thus, the market prospects of minisize hydrogen source integrated system are boundless.
Summary of the invention
In order to solve Problems existing in background technology, the present invention proposes a kind of multiple dimensioned reaction carriers with porous MCA and preparation method thereof.
The technical solution used in the present invention is:
One, a kind of multiple dimensioned reaction carriers with porous MCA
On rectangular slab, the microchannel that many row's parallel interval are uniform is had using rectangular slab as reaction carriers, the cross section of microchannel is inverted trapezoidal, in microchannel, three surfaces all have equally distributed micropore, micropore inside is rough surface, is formed the multiple dimensioned reaction carriers of microcosmic-Jie's sight-macroscopic view by micropore, microchannel and reaction carriers.
Described micropore is erose micropore.
The degree of depth of described micropore is 50-300 μm.
In described inverted trapezoidal cross section, microchannel, the length on long base is 0.8-1.5mm, and height is 0.6-1mm, and the angle on hypotenuse and long base is 60-70 °.
Distance between two described adjacent microchannel is 0.2-0.4mm.
Two, a kind of preparation method of the multiple dimensioned reaction carriers with porous MCA
Adopt surperficial sintering and dissolution process, concrete preparation process comprises the following steps:
1) abrasive dust: by Al alloy powder and salt powder respectively ball milling be granule, the bottom punch upper surface of mould has microflute, and the cross section of microflute is inverted trapezoidal;
2) powder is spread: on bottom punch upper surface, evenly drip one deck absolute ethyl alcohol, then uniform spreading last layer salt powder particles, subsequently Al alloy powder uniform particles is taped against above salt powder particles layer;
3) cold pressing: cold pressing in a mold, pressure is 100-400MPa, keeps 6-10 minute;
4) hot pressing: be placed in resistance furnace and heat, carries out hot pressing 10-15min and sinters 30-60min at temperature 570-600 DEG C, and pressure is 80-300MPa, after having sintered, with stove cooling, and carries out the demoulding;
5) dissolved salt: the base substrate demoulding obtained is placed in circulating water at normal temperatures, carries out dissolving 5-10min to salt powder particles;
6) process: eventually pass Linear cut, milling process is processed, obtain the multiple dimensioned reaction carriers being with porous MCA.
The size of described Al alloy powder particle is 20-60 μm, and the size of salt powder particles is 50-300 μm.
The thickness of described salt powder particles layer is 300-400 μm, and the thickness of Al alloy powder stratum granulosum is 1.5-2mm.
Described Al alloy powder is Al86SiCu semi-solid aluminium alloy, and salt powder is sodium chloride powder.
In the inverted trapezoidal cross section of described bottom punch surface microflute, the length on short base is 0.2-0.4mm, and height is 0.6-1mm, and the angle on hypotenuse and long base is 60-70 °.
The beneficial effect that the present invention has is:
The present invention, compared with traditional microchannel reaction carriers, can enlarge markedly its specific area, improves bond area and the adhesive force of catalyst simultaneously, thus improves reaction rate and the conversion ratio of alcohol reforming hydrogen production.
The present invention is compared with foam metal reaction carriers, and the one-shot forming manufacture of multiple dimensioned composite construction, improves the heat-transfer capability of reaction carriers, be beneficial to being uniformly distributed of reaction carriers temperature, and significantly can reduce the pressure drop of reaction, be beneficial to the stacked expansion of reaction carriers, expand the scale of reaction.
Surperficial sintering and dissolution process of the present invention, completes the one-shot forming manufacture of multiple dimensioned composite construction, simply efficiently, with low cost, is beneficial to large-scale promotion.
The surperficial sintering and dissolution process that the present invention adopts, based on the technique of powder metallurgy, forming effect is good, and machining amount is subsequently less, saves metal, reduces production cost.
The surperficial sintering and dissolution process that the present invention adopts, compared with the preparation carrying out foam metal, significantly reduces powder metallurgy formation to pressure, sintering temperature and the requirement of time, greatly reduces production cost with sintering and dissolution process.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the paving powder schematic diagram in preparation method of the present invention.
Fig. 3 is the flow chart of preparation method of the present invention.
In figure: 1, reaction carriers, 2, microchannel, 3, micropore, 4, former, 5, bottom punch, 6, upper punch, 7, salt powder particles, 8, Al alloy powder particle.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Figure 1, multiple dimensioned reaction carriers of the present invention comprises: on rectangular slab, have the microchannel 2 that many row's parallel interval are uniform using rectangular slab as reaction carriers 1, the cross section of microchannel 2 is inverted trapezoidal, interior three surfaces, microchannel 2 all have equally distributed micropore 3, micropore 3 inside is rough surface, is formed the multiple dimensioned reaction carriers of microcosmic-Jie's sight-macroscopic view by micropore 3, microchannel 2 and reaction carriers 1.
Micropore 3 is erose micropore, and the preferred degree of depth is 50-300 μm.
Preferably, in inverted trapezoidal cross section, microchannel 2, the length on long base is 0.8-1.5mm, and height is 0.6-1mm, and the angle on hypotenuse and long base is 60-70 °.
Preferably, the distance between two adjacent microchannel 2 is 0.2-0.4mm.
As shown in Figure 3, preparation method of the present invention, adopts surperficial sintering and dissolution process, and concrete preparation process comprises the following steps:
1) abrasive dust: by Al alloy powder and salt powder respectively ball milling be granule, bottom punch 5 upper surface of mould has microflute, and the cross section of microflute is inverted trapezoidal;
2) spread powder: on bottom punch 5 upper surface, evenly drip one deck absolute ethyl alcohol, then uniform spreading last layer salt powder particles 7, subsequently Al alloy powder particle 8 is evenly taped against above salt powder particles layer, then put upper punch 6 and be placed in former 4, as shown in Figure 2;
3) cold pressing: cold pressing in a mold, pressure is 100-400MPa, keeps 6-10 minute;
4) hot pressing: be placed in resistance furnace by mould and heat, carries out hot pressing and sintering at temperature 570-600 DEG C simultaneously, and 10-15min is carried out in hot pressing, and sintering carries out 30-60min, and pressure is 80-300MPa, after having sintered, with stove cooling, and carries out the demoulding;
5) dissolved salt: the base substrate demoulding obtained is placed in circulating water at normal temperatures, carries out dissolving 5-10min to salt powder particles 7;
6) process: eventually pass Linear cut, milling process is processed, obtain the multiple dimensioned reaction carriers 1 being with porous MCA.
Preferably, the size of Al alloy powder particle is 20-60 μm, and the size of salt powder particles is 50-300 μm.
Preferably, the thickness of salt powder particles layer is 300-400 μm, and the thickness of Al alloy powder stratum granulosum is 1.5-2mm.
Preferably, Al alloy powder 8 is Al86SiCu semi-solid aluminium alloy, and salt powder 7 is sodium chloride powder.
Preferably, in the inverted trapezoidal cross section of the surperficial microflute of bottom punch 5, the length on short base is 0.2-0.4mm, and height is 0.6-1mm, and the angle on hypotenuse and long base is 60-70 °, and wherein high and angle and inverted trapezoidal cross section, microchannel 2 are consistent.
Former 4, upper punch 6 and bottom punch 5 can adopt Cr12MoV mould steel.
In concrete enforcement, as shown in Figure 1, entirety is Rectangular Plate Structure to multiple dimensioned reaction carriers 1 of the present invention, and upper surface has 13 trapezoidal microchannels 2, and the length of going to the bottom of trapezoidal microchannel 2 is for 1.1mm, and height is 0.7mm, and hypotenuse and the angle of going to the bottom are 70 °; The surface, three, inside of trapezoidal microchannel 2 all has yardstick be the micropore 3 of 250 μm, micro-pore shape is the irregularly shaped of the saloid powder particles of class, and the coarse injustice of micropore 3 interior surface, its degree of depth is about 200 μm.
The present invention adopts surperficial sintering and dissolution process to carry out the preparation of multiple dimensioned reaction carriers.The core parts of microreactor are minute yardstick reaction carriers, with the multiple dimensioned reaction carriers of porous MCA, specific area and the reaction efficiency of reaction carriers can be improved further, by mixed powder, cold pressing, hot pressing, dissolving and following process, thus obtaining the multiple dimensioned reaction carriers with porous MCA, surperficial porous, microchannel and reaction carriers thin plate define the multiple dimensioned composite construction of microcosmic-Jie's sight-macroscopic view.
The present invention can realize the one-shot forming manufacture of multiple dimensioned composite construction, effectively improves the specific area of microreactor and the bond area of catalyst, is conducive to the attachment of catalyst and efficiently carrying out of reaction.Preparation method is simple, with low cost, can be applied in the reactions such as methyl alcohol steam reformation hydrogen production, effectively improve reaction efficiency, and reduce volume and and the weight of reactor.
Embodiments of the invention are as follows:
Embodiment 1
Preparation method of the present invention, adopts surperficial sintering and dissolution process, and concrete preparation process is:
The first step, abrasive dust and paving powder, as shown in Figure 2, be the particle of suitable size by Al alloy powder and salt grinding, the size of Al alloy powder particle 8 is about 20 μm, and the granular size of salt powder particles 7 is about 50 μm; Trapezoidal microchannel 2 is had at the upper surface of lower mould punching 5, first evenly last layer absolute ethyl alcohol is dripped at upper surface, uniform spreading last layer salt powder particles 7 again, subsequently Al alloy powder particle 8 is evenly taped against above salt powder particles 7, the thickness of salt powder particles 7 is about 300 μm, and the thickness of Al alloy powder particle 8 is about 1.5mm.
Second step, colds pressing, and colds pressing in a mold, and pressure is 100MPa, keeps 10 minutes.
3rd step, hot pressing, is placed on mould in resistance furnace and heats, target temperature 570 DEG C, sintering 60min, and after reaching target temperature, carry out hot pressing and keep 15min, pressure is 80MPa; After having sintered, with stove cooling, and carry out the demoulding.
4th step, dissolved salt, places the base substrate obtained in circulating water at normal temperatures, carries out the dissolving of salt powder particles 7, keep 5min, base substrate is formed the multiple dimensioned reaction carriers 1 obtaining being with porous MCA through the processes such as Linear cut, milling.
Al alloy powder 8 is Al86SiCu semi-solid aluminium alloy, and salt powder is sodium chloride powder.
The present invention adopts absolute ethyl alcohol, wetting bottom punch 5, and object is in the process of paving salt powder particles 7, forms certain cohesive force, ensure, on surface, three, the inside of microflute, to be all attached with salt powder particles 7 between two inclined-planes and salt powder particles of bottom punch microflute.
In the present invention, the following process of above-mentioned 4th step, through Linear cut, the circular slab after dissolved salt is processed into Rectangular Plate Structure, use milling process that the upper surface of the reaction carriers 1 having microchannel 2 is excised about 100 μm, make upper surface smoother, and the lower surface of milling reaction carriers 1 makes reaction carriers 1 reach thickness.
The multiple dimensioned reaction carriers of application band porous MCA carries out the reaction of alcohol reforming hydrogen production, and the alcohols of employing is methyl alcohol or ethanol, and the present invention's methyl alcohol elaborates the operation principle of multiple dimensioned reaction carriers in the present invention as raw material.
Supported catalyst on reaction carriers, adopt catalyst soakage method to carry out the load of catalyst, method is as follows:
The pretreatment of reaction carriers: reaction carriers, being polluted through formed machining, Linear cut process rear surface, leaves dirt.In order to corrosion reaction carrier surface oxide layer, remove dirt; Make its surface form certain micro-structural, the surface area of augmenting response carrier simultaneously, improve the adhesion strength of catalyst and reaction carriers, first must carry out the pretreatment before catalyst cupport to reaction carriers.Detailed process is reaction carriers is put into the NaOH solution that concentration is 20wt.%, corrodes about 2min under room temperature, naturally dries after cleaning.
The preparation of catalyst: the catalyst of load on reaction carriers is copper-based catalysts Cu/ZnO/Al
2o
3, catalyst larger for granularity is carried out ball milling, keeps 2h, obtain the catalyst fines that granule size is 50-100nm;
The configuration of maceration extract: required catalyst fines, Alumina gel and deionized water are mixed, stirs 2h in magnetic stirring apparatus, obtain uniform catalyst pulp maceration extract;
Flood: obtained reaction carriers is immersed in above-mentioned maceration extract, keep 60s, make the catalyst uniform load in liquid surperficial to reaction carriers;
Dry: obtained reaction carriers to be put into drying box, sets 80 DEG C, dry 2h;
Roasting: be positioned in Muffle furnace by above-mentioned reaction carriers, is warming up to 400 DEG C with the speed in 15 DEG C/min, opens Muffle furnace after roasting 2h, naturally cools.
The process that reaction carriers carries out the reformation of methanol-water vapour comprises three reactions, as follows:
Methyl alcohol steam reforming (SR):
Steam back reaction (rWGS):
Methanol Decomposition (DE):
The catalyst adopted is copper-based catalysts Cu/ZnO/AI
2o
3, before hydrogen production reaction starts, the removing of foreign gas in the reduction of catalyst and reaction system be carried out.Nitrogen is passed into reaction carriers, the air in microchannel, place to go; Then, reaction carriers is heated to 250 DEG C, the mist of nitrogen and hydrogen is incorporated microreactor, reductase 12 h is carried out to the copper-based catalysts on reaction carriers; Subsequently, methyl alcohol and steam are passed into microreactor, carry out the reaction of steam reforming, produce hydrogen, and carry out purification and the collection of hydrogen.
The reaction carriers prepared in the present invention, define porous surface, microcosmic-Jie of microchannel and reaction carriers sees-the multiple dimensioned composite construction of macroscopic view, effectively improve bond area and the stability of catalyst, ensure that the reaction efficiency of methyl alcohol steam reforming and the conversion ratio of alcohols; The one-shot forming of multiple dimensioned composite construction, improves the heat-transfer capability of reaction carriers, is beneficial to being uniformly distributed of reaction carriers temperature.
Embodiment 2
Preparation method of the present invention, adopts surperficial sintering and dissolution process, and concrete preparation process is:
The first step, abrasive dust and paving powder, as shown in Figure 2, Al alloy powder and salt powder are ground the particle into suitable size respectively, the size of Al alloy powder particle 8 is about 50 μm, and the granular size of salt powder particles 7 is about 180 μm; Trapezoidal microchannel 2 is had at the upper surface of lower mould punching 5, first evenly last layer absolute ethyl alcohol is dripped at upper surface, uniform spreading last layer salt powder particles 7 again, subsequently Al alloy powder particle 8 is evenly taped against above salt powder particles 7, the thickness of salt powder particles 7 is about 350 μm, and the thickness of Al alloy powder particle 8 is about 1.8mm.
Second step, colds pressing, and colds pressing in a mold, and pressure is 300MPa, keeps 8 minutes.
3rd step, hot pressing, is placed on mould in resistance furnace and heats, target temperature 590 DEG C, sintering 45min, and after reaching target temperature, carry out hot pressing and keep 12min, pressure is 200MPa; After having sintered, with stove cooling, and carry out the demoulding.
4th step, dissolved salt, places the base substrate obtained in circulating water at normal temperatures, carries out the dissolving of salt powder particles 7, keep 8min, base substrate is formed the multiple dimensioned reaction carriers 1 obtaining being with porous MCA through the processes such as Linear cut, milling.
Al alloy powder 8 is Al86SiCu semi-solid aluminium alloy, and salt powder is sodium chloride powder.
The present invention adopts absolute ethyl alcohol, wetting bottom punch 5, and object is in the process of paving salt powder particles 7, forms certain cohesive force, ensure, on surface, three, the inside of microflute, to be all attached with salt powder particles 7 between two inclined-planes and salt powder particles of bottom punch microflute.
In the present invention, the following process of above-mentioned 4th step, through Linear cut, the circular slab after dissolved salt is processed into Rectangular Plate Structure, use milling process that the upper surface of the reaction carriers 1 having microchannel 2 is excised about 100 μm, make upper surface smoother, and the thickness that the lower surface of milling reaction carriers 1 makes reaction carriers 1 reach.
Embodiment 3
Preparation method of the present invention, adopts surperficial sintering and dissolution process, and concrete preparation process is:
The first step, abrasive dust and paving powder, as shown in Figure 2, be the particle of suitable size by Al alloy powder and salt grinding, the size of Al alloy powder particle 8 is about 60 μm, and the granular size of salt powder particles 7 is about 300 μm; Trapezoidal microchannel 2 is had at the upper surface of lower mould punching 5, first evenly last layer absolute ethyl alcohol is dripped at upper surface, uniform spreading last layer salt powder particles 7 again, subsequently Al alloy powder particle 8 is evenly taped against above salt powder particles 7, the thickness of salt powder particles 7 is about 400 μm, and the thickness of Al alloy powder particle 8 is about 2mm.
Second step, colds pressing, and colds pressing in a mold, and pressure is 400MPa, keeps 5 minutes.
3rd step, hot pressing, is placed on mould in resistance furnace and heats, target temperature 600 DEG C, sintering 30min, and after reaching target temperature, carry out hot pressing and keep 15min, pressure is 300MPa; After having sintered, with stove cooling, and carry out the demoulding.
4th step, dissolved salt, places the base substrate obtained in circulating water at normal temperatures, carries out the dissolving of salt powder particles 7, keep 10min, base substrate is formed the multiple dimensioned reaction carriers 1 obtaining being with porous MCA through the processes such as Linear cut, milling.
Al alloy powder 8 is Al86SiCu semi-solid aluminium alloy, and salt powder is sodium chloride powder.
The present invention adopts absolute ethyl alcohol, wetting bottom punch 5, and object is in the process of paving salt powder particles 7, forms certain cohesive force, ensure, on surface, three, the inside of microflute, to be all attached with salt powder particles 7 between two inclined-planes and salt powder particles of bottom punch microflute.
In the present invention, the following process of above-mentioned 4th step, through Linear cut, the circular slab after dissolved salt is processed into Rectangular Plate Structure, use milling process that the upper surface of the reaction carriers 1 having microchannel 2 is excised about 100 μm, make upper surface smoother, and the lower surface of milling reaction carriers 1 makes reaction carriers 1 reach thickness.
The present invention adopts surperficial sintering and dissolution process, and successfully prepared the multiple dimensioned reaction carriers of band porous MCA, this reaction carriers is multiple dimensioned composite construction, effectively improves the specific area of reaction carriers.By changing the technological parameter in preparation process, can optimize concrete preparation process, wherein main influence factor is compacting pressure and sintering temperature, finds within the specific limits, and raising compacting pressure or sintering temperature can improve the forming quality of reaction carriers.
Claims (10)
1. the multiple dimensioned reaction carriers with porous MCA, it is characterized in that: on rectangular slab, have the microchannel (2) that many row's parallel interval are uniform using rectangular slab as reaction carriers (1), the cross section of microchannel (2) is inverted trapezoidal, microchannel (2) interior three surfaces all have equally distributed micropore (3), micropore (3) inside is rough surface, is formed the multiple dimensioned reaction carriers of microcosmic-Jie's sight-macroscopic view by micropore (3), microchannel (2) and reaction carriers (1).
2. a kind of multiple dimensioned reaction carriers with porous MCA according to claim 1, is characterized in that: described micropore (3) is erose micropore.
3. a kind of multiple dimensioned reaction carriers with porous MCA according to claim 1, is characterized in that: the degree of depth of described micropore (3) is 50-300 μm.
4. a kind of multiple dimensioned reaction carriers with porous MCA according to claim 1, it is characterized in that: in described microchannel (2) inverted trapezoidal cross section, the length on long base is 0.8-1.5mm, and height is 0.6-1mm, and the angle on hypotenuse and long base is 60-70 °.
5. a kind of multiple dimensioned reaction carriers with porous MCA according to claim 1, is characterized in that: the distance between two described adjacent microchannel (2) is 0.2-0.4mm.
6., for the preparation of the preparation method of a kind of multiple dimensioned reaction carriers with porous MCA of the arbitrary described carrier of claim 1-5, it is characterized in that: adopt surperficial sintering and dissolution process, concrete preparation process comprises the following steps:
1) abrasive dust: by Al alloy powder and salt powder respectively ball milling be granule, bottom punch (5) upper surface of mould has microflute, and the cross section of microflute is inverted trapezoidal;
2) powder is spread: on bottom punch (5) upper surface, evenly drip one deck absolute ethyl alcohol, then uniform spreading last layer salt powder particles (7), subsequently Al alloy powder particle (8) is evenly taped against above salt powder particles layer;
3) cold pressing: cold pressing in a mold, pressure is 100-400MPa, keeps 6-10 minute;
4) hot pressing: be placed in resistance furnace and heat, carries out hot pressing 10-15min and sinters 30-60min at temperature 570-600 DEG C, and pressure is 80-300MPa, after having sintered, with stove cooling, and carries out the demoulding;
5) dissolved salt: the base substrate demoulding obtained is placed in circulating water at normal temperatures, carries out dissolving 5-10min to salt powder particles (7);
6) process: eventually pass Linear cut, milling process is processed, obtain the multiple dimensioned reaction carriers (1) being with porous MCA.
7. the preparation method of a kind of multiple dimensioned reaction carriers with porous MCA according to claim 6, it is characterized in that: the size of described Al alloy powder particle is 20-60 μm, the size of salt powder particles is 50-300 μm.
8. the preparation method of a kind of multiple dimensioned reaction carriers with porous MCA according to claim 6, it is characterized in that: the thickness of described salt powder particles layer is 300-400 μm, the thickness of Al alloy powder stratum granulosum is 1.5-2mm.
9. the preparation method of a kind of multiple dimensioned reaction carriers with porous MCA according to claim 6, it is characterized in that: described Al alloy powder is Al86SiCu semi-solid aluminium alloy, salt powder is sodium chloride powder.
10. the preparation method of a kind of multiple dimensioned reaction carriers with porous MCA according to claim 6, it is characterized in that: in the inverted trapezoidal cross section of described bottom punch (5) surperficial microflute, the length on short base is 0.2-0.4mm, height is 0.6-1mm, and the angle on hypotenuse and long base is 60-70 °.
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| CN107244653B (en) * | 2017-06-09 | 2022-09-23 | 浙江大学 | Hydrogen production micro-reactor with catalyst carrier with uniform aperture and gradient porosity |
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| CN1514508A (en) * | 2003-05-21 | 2004-07-21 | 哈尔滨工业大学 | Electro actuating methanol reformer and used catalyst carrier |
| CN101601997A (en) * | 2008-06-10 | 2009-12-16 | 汉能科技有限公司 | A kind of catalyst for hydrogen production by self-heating reforming of methanol and preparation method thereof |
| US7888283B2 (en) * | 2008-12-12 | 2011-02-15 | Lihong Huang | Iron promoted nickel based catalysts for hydrogen generation via auto-thermal reforming of ethanol |
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