CN1219153C - Engine tail gas treater with microwave technology used and the catalyst and its prepn process - Google Patents
Engine tail gas treater with microwave technology used and the catalyst and its prepn process Download PDFInfo
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- CN1219153C CN1219153C CN 03111339 CN03111339A CN1219153C CN 1219153 C CN1219153 C CN 1219153C CN 03111339 CN03111339 CN 03111339 CN 03111339 A CN03111339 A CN 03111339A CN 1219153 C CN1219153 C CN 1219153C
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Abstract
The present invention relates to a microwave processor which can carry out purifying treatment for tail gas of gas oil and gasoline engines under the action of a microwave field, a metal catalyst used for a ceramic carrier of the microwave processor and a preparation method thereof. A catalyst performing catalytic action to the chemical reaction of exhaust gas in the microwave processor is loaded on the ceramic carrier, and components of the catalyst comprise Cu, CE, Mn, Co, V, etc. metal oxides and noble metal. The catalyze can effectively catalyze reduction reactions of CO, HC, NOx, etc. in automobile tail gas and simultaneously, and simultaneously, a resonant cavity of the microwave processor makes carbon fume particles which are exhausted from a gas oil engine and are adsorbed on the surface of the carrier combusted. The present invention not only can solve the problem of environmental pollution caused by the exhaust of the tail gas, but also can promote catalyst regeneration, and accordingly, the present invention has the advantages of effectively improving the efficiency of catalytic reactions and saving a great number of energy sources.
Description
Technical field
The present invention relates to a kind of microwave treater that under the microwave field effect, can carry out purified treatment to diesel oil and petrol engine tail gas, and the metallic catalyst that on microwave treater is made pottery the money carrier, uses and the preparation method of this metallic catalyst.
Technical background
Since coming out, diesel engine relied on its good power character, Economy and durability to be widely used in various power plant, as automobile, boats and ships and generator etc.Particularly the quantity of global diesel-oil vehicle increases sharply since the nineties in 20th century, and China's diesel-oil vehicle is also very swift and violent in the impetus of 20th century the mid-80 development later on.But because exhaust emissions of diesel engine is more and more serious to the pollution that air causes, development of diesel is very restricted.Being subjected to the pollutant component of Abgasgesetz control in the diesel engine vent gas mainly is CO, HC, NO
x(mainly comprise NO, NO here
2, N
2O
4And N
2O etc.) and charcoal cigarette particulate (PM) etc., wherein NO
xBe that a kind of harm is difficult for the toxic gas that is removed more greatly, again.Existing Diesel Engine Exhaust Control countermeasure technology comprises the content of three aspects such as engine technology, post-processing technology and fuel oil technology.So-called engine technology is meant and improves burning, suppresses NO
xTechnology with the PM generation.Post-processing technology is meant handles, further reduces NO with the engine emission material before entering atmosphere
xWith the technology of PM pollutant emission, post-processing technology mainly contains four kinds: oxidation catalyst technology, particle trapper (or particulate matter filter) technology, NO
xCatalyst technology, particulate matter and NO
xThe while purification technics.Noble metal " triple effect " catalyst technology of extensive use at present typically uses the combination of platinum, palladium and rhodium metal, can be simultaneously with the NO in the diesel engine vent gas
x, CO and HC catalysis makes it be converted to N when finally entering atmosphere
2, CO and H
2O is for the CO in the purification diesel engine tail gas, HC and NO
xGood effect is arranged, become the particularly main flow of purification catalyst for automobile exhaust of current diesel engine.So-called fuel oil technology is meant improves the derv fuel specification of quality, as cetane number, distillation condition, density, Sulpher content, aromatic hydrocarbons amount etc., to reduce NO
xDischarging with PM.
In the prior art " triple effect " though catalyzer can solve particularly purifying vehicle exhaust problem of present diesel engine because its low temperature active is poor, initiation temperature higher (generally greater than 200 ℃), thereby the tail gas clean-up effect is relatively poor when causing cold-starting automobile.And employed precious metal (as platinum, rhodium etc.) costs an arm and a leg, and is faced with the problem of resource exhaustion.And after catalyzer uses a period of time, because catalyst surface can be covered by charcoal cigarette particulate (PM) pollutant of etc.ing, can make catalytic effect decline, thereby produce the problem of so-called catalyst ageing.
Summary of the invention
The objective of the invention is: providing a kind of is carrier with the porous ceramics under the microwave field effect, by dipping, dry, calcining, makes multiple metal, metal oxide catalyst be compound in the purification of diesel on the carrier and the microwave treater of petrol engine tail gas.
Another object of the present invention provides employed catalyzer and this Preparation of catalysts method in the above-mentioned purpose.
As shown in Figures 1 and 2, be motor exhaust microwave treater of the present invention: by resonant cavity 1 with air outlet 2 and suction port 3, be installed in ceramic monolith 6 in the resonant cavity 1, the magnetron 4, the waveguide 5 that produce the 2450MHz microwave form.
Be provided with resonant cavity 1 at suction port 3 and 2 of air outlets, the high-pressure pulsating direct current that drive circuit shown in Figure 3 produces is supplied with magnetron 4, and the microwave that magnetron 4 produces 2450MHz enters resonant cavity through waveguide 5, and microwave power is 500-1000 watt.The inlet, outlet size of resonant cavity is unrestricted, and the resonant cavity material is stainless steel or other metallic material, and wall thickness 2mm is to 4mm, and length should be 1/4 times of microwave wavelength 2450Hz, waveguide infinite in length system.
As shown in Figure 2, ceramic monolith 6 is housed in the resonant cavity 1, ceramic monolith is by steinheilite (2MgO2Al
2O
35SiO
2), SiC and ZrO
2Make porous structure Deng material, can adopt wall-flow type cellular structure (shown in a figure) or foaming structure (shown in b figure), be loaded with catalyzer 7 of the present invention on the surface of ceramic monolith 6, between ceramic monolith and resonant cavity inwall, can be provided with fixedly packing 8, fixedly packing 8 plays vibration damping and the fixedly effect of ceramic monolith, vibration damping and fixing device be not for absorbing the material of microwave, as foam etc.
As shown in Figure 3, be the drive circuit that Rectified alternating current is provided for the management of microwave treater magnetic control, can power by vehicular power-bottle.Z1 is a reference diode, for main circuit provides stable 15V voltage, makes control circuit not be subjected to the influence of additional power source or automobile storage battery voltage change.U1 is PWM (pulsewidth modulation) generator, and producing frequency is the high frequency oscillation of 17KHz to 30KHz, regulates the frequency of RW2 and the pulse of C1 can regulate, to adapt to different switch transformers and power switch pipe.Regulate RW1 can regulate pulse width, reach the purpose of regulating output power.U2 is 555 time base circuits, produce the high frequency oscillation of a 1KHz to 10KHz, by regulating the output frequency that C2 and C3 can suitably regulate vibrator, coupling and D1 by C7 carry out reverse rectification, produce the voltage of one pact-15V on C6, to satisfy the driving requirement of IGBT, in order to drive T4 (IGBT), T1, T2, T3 provides ± driving voltage of 15V and enough electric currents to IGBT for driving triode.TR1 is a boosting transformer, and the 24V direct current of storage battery is become AC high voltage, and iron core must satisfy the requirement of frequency and power, can either be in 17KHz work and not generating heat for a long time under the situation in peak output under the frequency of 30KHz.Become the high-pressure pulsating direct current to High Level AC Voltage being carried out high-frequency rectification through D3.D3 is the fast powerful diode that recovers, and to be operated in 17KHz can satisfy output power to 30KHz and output current requirement.And be filtered into straight high voltage direct current through C5 and supply with magnetron, C5 must have enough withstand voltage (greater than 1000 volts) and enough capacity (2 to 5 microfarad).The characteristic of output pulse: the voltage on the T4 for frequency 17KHz to 30KHz, amplitude 100V is to the pulse of 400V, through TR1 boost with the T3 rectification after, obtain the Rectified alternating current of peak value 3000V to 4500V.
Support the catalyzer that microwave treater inner exhaust gas chemical reaction is played catalysis on the ceramic monolith, the composition of catalyzer is that the oxide of metals such as copper, cerium, manganese, cobalt and vanadium is (as CuO, CeO
2, MnO
2, Co
3O
4, V
2O
5Deng) and precious metal (Pt, Rh and Pd etc.), each metallic oxide and bullion content are counted by accounting for vehicle weight percentage:
Cupric oxide (CuO) 0.6-10%
Cerium oxide (CeO
2) 0.3-3%
Manganese oxide (MnO
2) 0-5%
Cobalt oxide (Co
3O
4) 0-3%
Vanadium oxide (V
2O
5) 0-5%
Platinum (Pt) 0-2%
Rhodium (Rh) 0-3%
Palladium (Pd) 0-2%
The method for preparing catalyzer on ceramic monolith is as follows:
A) with the aqueous solution of the salt of metallic cerium, concentration is 3%-20%, dipping ceramic monolith 1-25 hour, take out the carrier of dipping, in air, under room temperature, dried in the shade 5-20 hour, in air under 50-150 ℃ of temperature dry 1-5 hour then,, take out with stove cooling back then in 150-650 ℃ of temperature lower calcination 1-5 hour;
B) with concentration be the aqueous solution of the salt of the salt of the aqueous solution of mantoquita of 3-20% and manganese that concentration is 0-20%, cobalt, vanadium metal and platinum, rhodium, palladium precious metal, dipping ceramic monolith 1-25 hour;
C) take out the carrier of dipping, in air, under room temperature, dried in the shade 5-20 hour, in air under 50-150 ℃ of temperature dry 1-5 hour then;
D), take out with stove cooling back in 150-650 ℃ of temperature lower calcination 1-5 hour; As noble metal is arranged in the catalyzer, then need under 100-500 ℃ of temperature, to reduce 1 hour;
The salt of the metal described in the said method is nitrate, acetate or hydrochloride.Be in air, under room temperature, to dry in the shade with sorbing material degreasing cotton or filter paper.
Effect test: choose the identical blank carrier of two compositions No. 1 and No. 2.Supported metallic oxide on No. 1 carrier and made catalyzer, its composition is: CuO 0.8%, CeO
20.4%, MnO
20.3%.Then No. 1 carrier is put into 10 seconds of microwave field, take out and measure its temperature, reach 80 ℃; Put into 20 seconds of microwave field, take out and measure its temperature, reach 135 ℃; Put into 30 seconds of microwave field, take out and measure its temperature, reach 150 ℃, again time expand, its temperature does not roughly change.No. 2 blank carriers are put into identical microwave field, and the temperature of carrier does not change with the time of putting into microwave field substantially.This shows that metallic catalyst has very strong absorption to microwave energy.
In the microwave resonance processor, under the acting in conjunction of microwave field and catalyzer, the reaction mechanism of all gases is in the tail gas:
As shown in Figure 4, be the time dependent experimental curve diagram of content of NO and CO in the processor under microwave action.Reaction region: catalyzer consists of CuO 0.8%, CeO on the carrier
20.4%, MnO
20.3%, NO is that 329ppm, CO are 228ppm, O in the processor
2Be 4.4%, N
2Be carrier gas, microwave power 800W.C represents the concentration curve of NO, and B represents the concentration curve of CO, and from figure as can be seen: As time goes on, the content of CO and NO all descends to some extent, and the ratio that descends is 1: 1.The microwave treater of catalyzer of the present invention is used in this explanation can remove CO and NO in the vehicle exhaust simultaneously effectively, has the multiple catalyzing effect.Simultaneously, because CO and NO etc. also are the main pollution composition in the petrol engine last person of the institute gas, so microwave treater of the present invention also has good catharsis to petrol engine tail gas.The reaction mechanism of oxious component is in the vehicle exhaust under the acting in conjunction of microwave and catalyzer:
As shown in Figure 5, be the temperature plotted curve over time of carrier when carrier surface is adsorbed with charcoal cigarette particulate (PM) under microwave action, from this width of cloth figure as can be seen, when microwave begins to act on 210 seconds, bed temperature reaches the highest (＞800 ℃), tends to be steady then.
As shown in Figure 6, be oxygen content plotted curve over time in charcoal cigarette particulate (PM) when burning tail gas in the resonant cavity under microwave action, from this width of cloth figure as can be seen, when microwave began to act on about 210 seconds, it is minimum that oxygen content reaches, and gos up then.
By last two width of cloth figure as can be seen, under microwave action, in resonant cavity, the charcoal cigarette particulate of carrier surface absorption can absorb microwave energy in the short period of time, thereby makes charcoal cigarette particulate itself reach very high temperature, and then burning.When 210 seconds, resonance cavity temperature and oxygen content reach extreme value simultaneously, and this explanation burning of charcoal cigarette particulate in the time of 210 seconds culminates.Temperature and oxygen content all tend to be steady subsequently, and this explanation combustion process finishes substantially, and can effectively remove filter by this process is the charcoal cigarette particulate that adsorbs on the ceramic monolith.Catalyzer can fully be contacted with tail gas, every chemical reaction in the catalysis resonant cavity more effectively, we are referred to as the regeneration of catalyzer this phenomenon, by calculating to charcoal cigarette particle mass on the carrier before and after the reaction, have to surpass that 80% carbon granule is burned to be fallen, so can think that the regeneration efficiency of catalyzer can reach about 80%.
By comparative trial, show the firing point when metallic catalyst can reduce the carbon granule burning effectively.In resonant cavity, when not using any metal and precious metal catalyst, the carbon granule initiation temperature needs about 600 degree, when only making precious metal catalysts such as platinum, rhodium, palladium, the initiation temperature of carbon granule is about 370 degree, when using multiple metal composite catalyst such as other metal such as cupric oxide, cerium oxide, manganese oxide, the initiation temperature of carbon granule is about 260 degree.
As shown in Figure 7, it is carbon granule (PM) and NO conversion ratio curve over time under microwave action in the resonant cavity under microwave action, under the acting in conjunction of microwave and catalyzer, increase along with action time, the conversion ratio of NO and carbon granule all increases to some extent, as seen carbon granule has good reduction to NO, and conversion ratio can reach 70%.Curve B is the conversion rate curve of NO, and curve C is the conversion rate curve of carbon granule.Its reduction mechanism is:
In sum, as seen use processor of the present invention to compare and have following advantage and effect with existing technology:
1, the catalyzer reduction reaction of CO, HC and NOx etc. in the catalytic car tail-gas effectively, emit after harmful gas reduction become innocuous gas, vehicle exhaust is played the effect of purification, so not only be applicable to diesel engine, and be applicable to petrol engine;
2, the metallic catalyst preparation method on the carrier is simple, low price, and easy to use, effect is obvious;
3, the microwave treater resonant cavity is under the effect of microwave, the charcoal cigarette particulate of the diesel emission that is adsorbed on carrier surface can be burned be fallen, not only can solve the pollution emission problem of environment, and make catalyst regeneration, improve catalytic reaction efficient effectively, thereby save a large amount of energy.
Description of drawings
Fig. 1: the engine tail gas processing device of applied microwave technology of the present invention;
Fig. 2 (a): the sectional view of processor shown in Figure 1-application wall-flow type structural ceramics carrier;
Fig. 2 (b): the sectional view of processor shown in Figure 1-application foaming structure ceramic monolith;
Fig. 3: the drive circuit that the high-frequency DC source is provided for Fig. 1 processor magnetron;
Fig. 4: CO and the NO plotted curve that content changed along with the time under microwave action in the resonant cavity;
Fig. 5: in the resonant cavity under the microwave field effect temperature plotted curve over time;
Fig. 6: in the resonant cavity under the microwave field effect oxygen content plotted curve over time;
Fig. 7: carbon granule and NO in time conversion rate curve under microwave action.
Preferred forms
Embodiment 1:
Get a certain amount of cerous nitrate and be made into 4% solution, cellular ceramic substrate is put into wherein, soaked 5 hours, take out then, utilize degreasing cotton that it was dried in the shade under room temperature 12 hours in air, then in air, under 60 ℃ of temperature, in baking oven, dried 3 hours, under 250 ℃ temperature, in High Temperature Furnaces, calcined 2 hours then.Take out with stove cooling back, the mixed solution (concentration of copper nitrate is 3%, the concentration of manganese nitrate be 1.5%) of putting into copper nitrate and manganese nitrate then soaked 5 hours, take out then, utilize degreasing cotton, it was at room temperature dried in the shade in air 12 hours, under 60 ℃ of temperature, in baking oven, dried 3 hours, under 250 ℃ temperature, in High Temperature Furnaces, calcined 2 hours then.Take out with stove cooling back, so just on carrier, prepared catalyzer of the present invention.(weigh) after testing, the content of catalyzer is respectively on the carrier: cupric oxide 0.8%, cerium oxide 0.9%, manganese oxide 0.4%.
Embodiment 2:
Get a certain amount of cerous nitrate and be made into 4% solution, cellular ceramic substrate is put into wherein, soaked 5 hours, take out then, utilize degreasing cotton that it was dried in the shade under room temperature 12 hours in air, then in air, under 60 ℃ of temperature, in baking oven, dried 3 hours, under 250 ℃ temperature, in High Temperature Furnaces, calcined 2 hours then.Take out with stove cooling back, get a certain amount of copper nitrate, platinum nitrate, rhodium nitrate and palladium nitrate then and be made into 8%, 1%, 1.5% and 2% solution respectively, and with its mixing.Then carrier is put into wherein, soaked 15 hours, take out then, utilize degreasing cotton, it was dried in the shade under room temperature 20 hours in air, then in air, oven dry is 2 hours under 150 ℃ of temperature, 300 ℃ temperature lower calcination 1 hour, takes out with stove cooling back then.(weigh) after testing in last hydrogen reducing 1 hour of using under 400 ℃ temperature, the content of each metallic oxide and precious metal is respectively: cerium oxide 0.9%, cupric oxide 1.8%, Pt 0.3%, Rh0.32% and Pd 0.35%.
Embodiment 3:
Get a certain amount of cerous nitrate and be made into 12% solution, then carrier is put into wherein, soaked 7 hours, take out then, utilize degreasing cotton that it was dried in the shade under room temperature 18 hours in air, then in air, under 70 ℃ of temperature, in baking oven, dried 2 hours, under 300 ℃ temperature, in High Temperature Furnaces, calcined 2.5 hours then, take out with stove cooling back.Then, the mixed solution (concentration of copper nitrate is 15%, the concentration of palladium chloride be 2.5%) of putting into copper nitrate and palladium chloride soaked 7 hours, take out then, utilize degreasing cotton that it was dried in the shade under room temperature 18 hours in air, under 70 ℃ of temperature, in baking oven, dried 2 hours, under 300 ℃ temperature, in High Temperature Furnaces, calcined 2.5 hours then.Take out last hydrogen reducing 1.5 hours of under 350 ℃ temperature, using with stove cooling back.So just obtained catalyzer of the present invention on ceramic monolith, the content of (weighing) after testing is respectively: cupric oxide 3.9%, cerium oxide 2.5%, palladium 0.32%.
Embodiment 4:
Get a certain amount of cerous nitrate and be made into 15% solution, then carrier is put into wherein, soaked 4 hours, take out then, utilize degreasing cotton that it was at room temperature dried in the shade in air 15 hours, then in air, under 120 ℃ of temperature, in baking oven, dried 1.5 hours, under 400 ℃ temperature, in High Temperature Furnaces, calcined 4 hours then.Take out with stove cooling back.Then, the mixed solution (concentration is respectively 20%, 10%, 8%, 4% and 5%) of putting into copper nitrate, nitric acid vanadium, cobalt acetate, rhodium nitrate and platinum nitrate soaked 16 hours, take out then, utilize degreasing cotton that it was at room temperature dried in the shade in air 16 hours, under 120 ℃ of temperature, in baking oven, dried 1.5 hours, under 400 ℃ temperature, in High Temperature Furnaces, calcined 4 hours then.Take out with stove cooling back, under 400 ℃ of temperature, use hydrogen reducing 1 hour at last, so just on ceramic monolith, obtained catalyzer of the present invention.(weigh) after testing, content is respectively: cupric oxide 5.6%, cerium oxide 2.8%, vanadium oxide 3.4%, cobalt oxide 3.0%, rhodium 0.7%, platinum 1%.
Embodiment 5:
Get a certain amount of cerous nitrate and be made into 9% solution, then carrier is put into wherein, soaked 4 hours, take out then, utilize degreasing cotton that it was at room temperature dried in the shade in air 15 hours, then in air, under 110 ℃ of temperature, in baking oven, dried 1.1 hours, under 350 ℃ temperature, in High Temperature Furnaces, calcined 4. hours then.Take out with stove cooling back.Then, putting into copper nitrate, cobalt acetate, manganese nitrate mixed solution (concentration is respectively 19%, 7.5% and 10%) soaked 4.5 hours, take out then, utilize degreasing cotton that it was at room temperature dried in the shade in air 16 hours, under 120 ℃ of temperature, in baking oven, dried 1.2 hours, under 300 ℃ temperature, in High Temperature Furnaces, calcined 4.5 hours then, take out with stove cooling back.So just on ceramic monolith, obtained catalyzer of the present invention.(weigh) after testing, content is respectively: cupric oxide 5.4%, cerium oxide 1.5%, manganese oxide 3.0%, cobalt oxide 2.7%.
Embodiment 6:
Get a certain amount of cerous nitrate and be made into 10% solution, then carrier is put into wherein, soaked 4.5 hours, take out then, utilize degreasing cotton that it was at room temperature dried in the shade in air 16 hours, then in air, under 120 ℃ of temperature, in baking oven, dried 1.2 hours, under 300 ℃ temperature, in High Temperature Furnaces, calcined 4.5 hours then.Take out with stove cooling back.Then, the mixed solution (concentration is respectively 20%, 8% and 5%) of putting into copper nitrate, cobalt acetate and palladium chloride soaked 12 hours, take out then, utilize degreasing cotton that it was at room temperature dried in the shade in air 16 hours, under 120 ℃ of temperature, in baking oven, dried 1.2 hours, under 300 ℃ temperature, in High Temperature Furnaces, calcined 4.5 hours then.Take out with stove cooling back, under 400 ℃ of temperature, use hydrogen reducing 1 hour at last, so just on ceramic monolith, obtained catalyzer of the present invention.(weigh) after testing, content is respectively: cupric oxide 5.6%, cerium oxide 1.6%, cobalt oxide 2.8%, palladium 0.7%.
Claims (6)
1, a kind of engine tail gas processing device of applied microwave technology, by resonant cavity (1) with air outlet (2) and suction port (3), be installed in ceramic monolith (6) in the resonant cavity (1), the magnetron (4) that links to each other with resonant cavity (1) by waveguide (5) reaches and forms for magnetron provides the drive circuit in high-frequency DC source, the resonant cavity material is stainless steel or other metallic material, wall thickness 2mm is to 4mm, and length should be 1/4 times of microwave wavelength 2450Hz; It is characterized in that: the surface of ceramic monolith (6) is loaded with metallic oxide and precious metal catalyst, and each metallic oxide and bullion content are counted by vehicle weight percentage:
Cupric oxide (CuO) 0.6-10%
Cerium oxide (CeO
2) 0.3-3%
Manganese oxide (MnO
2) 0-5%
Cobalt oxide (Co
3O
4) 0-3%
Vanadium oxide (V
2O
5) 0-5%
Platinum (Pt) 0-2%
Rhodium (Rh) 0-3%
Palladium (Pd) 0-2%
2, the motor exhaust microwave treater of applied microwave technology as claimed in claim 1 is characterized in that: ceramic monolith (6) is by steinheilite, SiC or ZrO
2The porous ceramics that material is made adopts wall-flow type cellular structure or foaming structure.
3, a kind of method that on ceramic monolith, prepares metallic catalyst, its step is as follows:
A) with the aqueous solution of the salt of metallic cerium, concentration is 3%-20%, dipping ceramic monolith 1-25 hour, take out the carrier of dipping, in air, under room temperature, dried in the shade 5-20 hour, in air under 50-150 ℃ of temperature dry 1-5 hour then,, take out with stove cooling back then in 150-650 ℃ of temperature lower calcination 1-5 hour;
B) with concentration be the aqueous solution of the salt of the salt of the aqueous solution of mantoquita of 3-20% and manganese that concentration is 0-20%, cobalt, vanadium metal and platinum, rhodium, palladium precious metal, dipping ceramic monolith 1-25 hour;
C) take out the carrier of dipping, in air, under room temperature, dried in the shade 5-20 hour, in air under 50-150 ℃ of temperature dry 1-5 hour then;
D), take out with stove cooling back in 150-650 ℃ of temperature lower calcination 1-5 hour; As noble metal is arranged in the catalyzer, then need under 100-500 ℃ of temperature, to reduce 1 hour;
4, the method for preparing metallic catalyst on ceramic monolith as claimed in claim 3 is characterized in that: the salt of described metal is nitrate, acetate or hydrochloride.
5, the method for preparing metallic catalyst on ceramic monolith as claimed in claim 3 is characterized in that: dry in the shade with sorbing material degreasing cotton or filter paper under room temperature in air.
6, the method for preparing metallic catalyst on ceramic monolith as claimed in claim 3 is characterized in that: the reduction reaction of carrying out noble metal with hydrogen.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03111339 CN1219153C (en) | 2003-03-30 | 2003-03-30 | Engine tail gas treater with microwave technology used and the catalyst and its prepn process |
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|---|---|---|---|
| CN 03111339 CN1219153C (en) | 2003-03-30 | 2003-03-30 | Engine tail gas treater with microwave technology used and the catalyst and its prepn process |
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| CN1441153A CN1441153A (en) | 2003-09-10 |
| CN1219153C true CN1219153C (en) | 2005-09-14 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090288380A1 (en) * | 2004-07-12 | 2009-11-26 | Vincent Gleize | Filtration structure, in particular a particulate filter for the exhaust gases of an internal combustion engine, and associated exhaust line |
| CN101574625B (en) * | 2008-09-29 | 2011-09-28 | 豆立新 | Tail gas catalytic purification system of dual-fuel engine |
| CN101881739B (en) * | 2010-06-22 | 2014-03-05 | 浙江双元科技开发有限公司 | Microwave concentration meter and method thereof based on DSP and processor of single chip computer to carry out concentration measurement |
| CN102168598A (en) * | 2011-04-18 | 2011-08-31 | 长沙矿山研究院 | Tail gas purifying and silencing device for diesel engine |
| WO2013097677A1 (en) * | 2011-12-30 | 2013-07-04 | 湘潭大学 | Microwave catalyst and preparation process and use thereof |
| CN109579033B (en) * | 2018-12-13 | 2020-09-04 | 西安建筑科技大学 | Volatile organic compound combustion device and simulation detection device and method thereof |
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