CN1218788C - Sol-gel method for preparing three-effect tail gas catalyst - Google Patents
Sol-gel method for preparing three-effect tail gas catalyst Download PDFInfo
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Abstract
The present invention relates to a three-way auto-exhaust catalyst, more specifically to a method for preparing three-way exhaust catalysts by a sol-gel method. Soluble salts of Al, Ce, La and Ba are dissolved by water to obtain a mixed solution; a citric acid alcohol solution is slowly added to the mixed solution as complexing agents under the condition of stir until the mixed solution becomes sol; the sol is dried and is roasted to be carrier materials; an aqueous solution of soluble salts of Pt and Rh is impregnated on the carrier materials in a vacuum, and noble metal catalyst powder is obtained by drying and hydrogen reduction. The three-way catalyst prepared by the technique of the present invention has good high temperature sintering resisting capacity, and has the characteristics of low cost, short periods, no pollution, etc. when ensured having enough long service life in the state of high temperature use.
Description
Technical field
The present invention relates to the vehicle tail gas triple effect catalyst, specifically a kind of sol-gel process prepares the method for triple effect tail-gas catalyst.
Background technology
Vehicle exhaust is one of main air pollution sources, and a large amount of discharge tail gas sharply worsen environment for human survival.Therefore, be protection of the environment, many countries all actively work out and execute tail-gas law, and along with the enhancing of Public environmental attitude and the development of technology, Abgasgesetz is more and more stricter, and its final goal is to make automobile reach the zero-emission standard.The U.S., the European Community and Japan are in rank first to the research of draining technology always, and performed discharge standard is also comparatively strict, and the rules of enabling at present in these countries are EU-III or suitable with it rules.China is starting late aspect the tail gas control, and lags behind advanced international standard, but owing to obtain society's attention, the speed of development is very fast: Beijing planned to reach Europe 2 EU-II standards in 2005, reached the EU-III standard in 2005.
Reach No. 3 standards in Europe, the purifying problem of cold start-up stage tail gas is one of key that must solve.At present the solution that adopts is to install a close-coupled catalyst (Close-coupled main catalyst) additional near the engine exhaust port place, utilizes the high temperature of exhaust ports to make catalyst at cold start-up stage ignition fast.Because near engine, close-coupled catalyst is worked under the condition of high temperature for a long time, thereby sintering deactivation speeds up.Same problem also existing in various degree in such as other cold start-up technology such as burner (Fuel burner) technology, exhaust igniting (Exhaust gas ignition) technology.
Therefore, cooled activated catalyst will have good high temperature sintering resistant performance and could guarantee enough service life.And utilize traditional Al
2O
3Its high temperature resistance of three-way catalyst that dipping noble metal method obtains not is fine, is difficult to reach the life requirements of EU-III standard catalyst.The method of raising catalyst high temperature resistant property has multiple, and wherein, the sol-gel catalyst preparation technology is one of effective mode.
Utilize the material of sol-gel process preparation to have that content is easy to control, element is uniformly dispersed and the stability of material advantages of higher, so this method uses very extensively in field of material preparation, and the example of three-way catalyst preparation is arranged.Adopt the three-way catalyst of sol-gel process preparation to show characteristics such as crystal grain is tiny, specific surface is high, high temperature resistant property is good, thereby can satisfy the requirement of cooled activated catalyst, have bright development prospect high temperature resistant property.But original technology has following deficiency: 1, metal ion is introduced with the chemical combination attitude of alkoxide, and metal alkoxide preparation difficulty costs an arm and a leg, and directly causes the cost of three-way catalyst to rise; The organic matter majorities such as isopropyl alcohol that discharge when 2, alkoxide decomposes are harmful, do not meet environmental protection requirement; 3, alkoxide sol-gel method preparation flow more complicated, fabrication cycle is long, is unfavorable for suitability for industrialized production.The existence of these several defectives makes traditional sol-gel three-way catalyst preparation rest on laboratory stage always, apart from the marketization certain distance is arranged still.
Summary of the invention
Defective at traditional alkoxide sol-gel method, the object of the present invention is to provide a kind of new sol-gel process to prepare the method for triple effect tail-gas catalyst, utilize the three-way catalyst of the technology of the present invention preparation to have good high temperature sintering resistant ability, can guarantee to have characteristics such as cost is low, the cycle short, pollution-free when catalyst has enough life-spans under the high temperature user mode.
To achieve these goals, technical scheme of the present invention is: get the soluble-salt water dissolving of Al, Ce, La, Ba, obtain mixed solution; Under stirring condition, slowly add in described mixed solution, to solation as complexing agent the citric acid alcoholic solution; With described colloidal sol drying, roasting obtains carrier material again; The soluble-salt aqueous solution vacuum impregnation of Pt and Rh is on carrier material, and dry, and hydrogen reducing promptly gets catalyst fines;
The soluble-salt weight ratio of described citric acid and Al, Ce, La, Ba is: 120～500: 510-670; Described Al, Ce, La, Ba soluble-salt composition adopt the form of nitrate to add; The soluble-salt nitrate form Al (NO of described Al, Ce, La, Ba
3)
39H
2O, Ce (NO
3)
36H
2O, La (NO
3)
36H
2O, Ba (NO
3)
2The weight ratio of addition is: 480～590: 25～52: 2.6～10: 3.4～17; It is 30 ℃～50 ℃ times 2～5 hours that described colloidal sol becomes the stirring condition in the glue process, is stirred to into glue under 70 ℃～90 ℃ again; Mixing speed is 300-400r/min; The roasting condition of colloidal sol is after dry: 500 ℃～600 ℃, 3～6 hours; Described Pt and the Rh total content in catalyst is 1%～4%, and both weight ratios are: 1.5～3: 1.
Compared with prior art, the present invention has more following beneficial effect:
1. has environment protection significance.The gas that produces in preparation process of the present invention is mainly CO
2, alkoxide decomposes the air pollution that causes when having avoided traditional sol-gel process to prepare catalyst, thereby has the remarkable economical environmental benefit.
2. cost is low.The present invention adopts cheap citric acid to make complexing agent, is the feedstock production three-way catalyst with the nitrate of metal, and described citric acid and nitrate are chemical reagent commonly used, so cost is far below alkoxide.
3. the preparation process weak point helps cost control.The present invention adopts citric acid to make complexing agent, is the feedstock production three-way catalyst with the nitrate of metal, except the cost that can reduce sol-gel process, has both kept the advantage of sol-gel process, has shortened technological process again.
4. function admirable.Utilize the three-way catalyst of the technology of the present invention preparation to have good high temperature sintering resistant ability, can guarantee that catalyst has enough life-spans under the applied at elevated temperature state.
5. preparation method of the present invention is simple, helps suitability for industrialized production.
The specific embodiment
Embodiment
(1) embodiment 1:
1. get 588 gram Al (NO
3)
39H
2O, 25.2 gram Ce (NO
3)
36H
2O, 5.32 gram La (NO
3)
36H
2O, 10.2 gram Ba (NO
3)
2, with the water-soluble solution of 800ml, obtain mixed solution;
2. get 250 gram citric acids, with the dissolving of 500ml alcohol;
3. under stirring condition, the alcoholic solution of citric acid slowly joined step 1. in the gained mixed solution, and 300r/min continues to stir 5 hours under 40 ℃ of temperature, and then stirs under 80 ℃ of temperature, until the thorough solation of solution;
4. with described colloidal sol under 110 ℃, air atmosphere dry 12 hours, obtained loose foam-like carrier material in 4 hours in 600 ℃ of roastings more afterwards;
5. with 50ml dissolved in distilled water 3.2 gram H
2PtCl
6Rh (the NO of+1.4 grams
3)
3
6. with 4. gained carrier material vacuum impregnation step solution 5. of step, oven dry in 12 hours under 100 ℃ of air atmospheres afterwards, dipping carries out repeatedly with oven dry then, all is absorbed until solution;
7. the above-mentioned powder of hydrogen reducing 6 hours under 550 ℃ of conditions can obtain catalyst fines of the present invention.
With gained catalyst fines compressing tablet, granulation, can obtain the pellet type catalyst that granularity is 0.3～0.5mm again.Its weight ratio of constituents is: Al
2O
3-80%, CeO
2-10%, La
2O
3-2%, BaO-6%, Pt-1.5%, Rh-0.5%.
(2) embodiment 2: different from EXAMPLE l be in: step 3. in 30 ℃ of lower stirrings 2 hours, under 70 ℃, be stirred to again complete solation, step 4. roasting condition be 500 ℃ of 6 hours, Al (NO
3)
39H
2The O amount of taking is 514.5 grams, Ce (NO
3)
36H
2The O amount of taking is 50.4 grams.The weight ratio of constituents of last gained catalyst is: Al
2O
3-70%, CeO
2-20%, La
2O
3-2%, BaO-6%, Pt-1.5%, Rh-0.5%.
(3) embodiment 3: different from embodiment 1 be in: step 3. in 50 ℃ of lower stirrings 2 hours, under 90 ℃, be stirred to again complete solation, Al (NO
3)
39H
2The O amount of taking is 522 grams, Ce (NO
3)
36H
2The O amount of taking is 50.4 grams, La (NO
3)
36H
2The O amount of taking is 2.7 grams.The weight ratio of constituents of last gained catalyst is: Al
2O
3-71%, CeO
2-20%, La
2O
3-1%, BaO-6%, Pt-1.5%, Rh-0.5%.
(4) embodiment 4: be in Al (NO from embodiment 1 different
3)
39H
2The O amount of taking is 500 grams, Ce (NO
3)
36H
2The O amount of taking is 50.4 grams, H
2PtCl
6The amount of taking is 6.3 grams, Rh (NO
3)
3The amount of taking is 2.8 grams.The weight ratio of constituents of last gained catalyst is: Al
2O
3-68%, CeO
2-20%, La
2O
3-2%, BaO-6%, Pt-3%, Rh-1%.
(5) embodiment 5: different from embodiment 1 be in: step 4. roasting condition be 550 ℃ of 5 hours, Al (NO
3)
39H
2The O amount of taking is 573 grams, H
2PtCl
6The amount of taking is 6.3 grams, Rh (NO
3)
3The amount of taking is 2.8 grams.The weight ratio of constituents of last gained catalyst is: Al
2O
3-78%, CeO
2-10%, La
2O
3-2%, BaO-6%, Pt-3%, Rh-1%.
(6) embodiment 6: be in Al (NO from embodiment 1 different
3)
39H
2The O amount of taking is 514.5 grams, Ce (NO
3)
36H
2The O amount of taking is that 50.4 grams, the citric acid amount of taking are 500 grams.The weight ratio of constituents of last gained catalyst is: Al
2O
3-70%, CeO
2-20%, La
2O
3-2%, BaO-6%, Pt-1.5%, Rh-0.5%.
(7) embodiment 7: be in Al (NO from embodiment 1 different
3)
39H
2The O amount of taking is 529 grams, Ce (NO
3)
36H
2The O amount of taking is 38 grams, Ba (NO
3)
2The amount of taking is that 15.3 grams, the citric acid amount of taking are 120 grams.The weight ratio of constituents of last gained catalyst is: Al
2O
3-72%, CeO
2-15%, La
2O
3-2%, BaO-9%, Pt-1.5%, Rh-0.5%.
(8) embodiment 8: different from embodiment 1 be in: step 3. in 40 ℃, 400r/min stirred 2 hours, under 90 ℃, be stirred to again complete solation, Al (NO
3)
39H
2The O amount of taking is 533 grams, Ce (NO
3)
36H
2The O amount of taking is 50.4 grams, La (NO
3)
36H
2The O amount of taking is 9.31 grams, Ba (NO
3)
2The amount of taking is 3.4 grams, and the weight ratio of constituents of last gained catalyst is: Al
2O
3-72.5%, CeO
2-20%, La
2O
3-3.5%, BaO-2%, Pt-1.5%, Rh-0.5%.
(9) embodiment 9: different from embodiment 1 be in: step 3. in 40 ℃, 350r/min stirred 4 hours, under 90 ℃, be stirred to again complete solation, Al (NO
3)
39H
2The O amount of taking is 529 grams, Ce (NO
3)
3H
2The O amount of taking is 38 grams, Ba (NO
3)
2The amount of taking is 15.3 grams, H
2PtCl
6The amount of taking is 2.52 grams, Rh (NO
3)
3The amount of taking is 2.24 grams, and the weight ratio of constituents of last gained catalyst is: Al
2O
3-72%, CeO
2-15%, La
2O
3-2%, BaO-9%, Pt-1.2%, Rh-0.8%.
Performance evaluation to catalyst is carried out under the environment of simulated automotive tail gas.Simulated exhaust gas composed as follows: CO
2(12%), O
2(1.2%), CO (1.5%), HC (1000ppm), NOx (1000ppm), N
2(85.1%).Other test condition is: gas flow 3L/min, catalyst volume 5ml, air speed 3.6 * 10
4h
-1Distinguish detecting catalyst under these conditions under green state, through 900 ℃ of initiation temperature T that wore out 5 hours, 1200 ℃ after wearing out 2 hours
50, with this performance that indicates catalyst, test result sees Table 1.
The purification test result of sol-gel catalyst under the table 1 simulated exhaust gas condition
| Catalyst | Initiation temperature (T 50) | |||||||||||
| Embodiment 1 Al 2O 3-80％ CeO 2-10％ La 2O 3-2％ BaO-6％ Pt-1.5％ Rh-0.5％ | Embodiment 2 Al 2O 3-70％ CeO 2-20％ La 2O 3-2％ BaO-6％ Pt-1.5％ Rh-0.5％ | Embodiment 3 Al 2O 3-71％ CeO 2-20％ La 2O 3-1％ BaO-6％ Pt-1.5％ Rh-0.5％ | Embodiment 4 Al 2O-68％ CeO 2-20％ La 2O 3-2％ BaO-6％ Pt-3％ Rh-1％ | |||||||||
| HC | CO | NOx | HC | CO | NOx | HC | CO | NOx | HC | CO | NOx | |
| Calcined catalyst not | 275 | 273 | 274 | 262 | 245 | 262 | 263 | 265 | 273 | 243 | 242 | 242 |
| 900 ℃ of roastings in 5 hours | 243 | 246 | 251 | 235 | 240 | 233 | 232 | 236 | 233 | 221 | 220 | 221 | |||||
| 1200 ℃ of roastings in 2 hours | 292 | 287 | 290 | 265 | 265 | 265 | 265 | 264 | 262 | 275 | 276 | 278 | |||||
| Initiation temperature (T 50) | |||||||||||||||||
| Embodiment 5 Al 2O 3-78％ CeO 2-10％ La 2O 3-2％ BaO-6％ Pt-3％ Rh-1％ | Embodiment 6 Al 2O 3-70％ CeO 2-20％ La 2O 3-2％ BaO-6％ Pt-1.5％ Rh-0.5％ | Embodiment 7 Al 2O 3-72％ CeO 2-15％ La 2O 3-2％ BaO-9％ Pt-1.5％ Rh-0.5％ | Embodiment 8 Al 2O 3-72.5％ CeO 2-20％ La 2O 3-3.5％ BaO-2％ Pt-1.5％ Rh-0.5％ | Embodiment 9 Al 2O 3-72％ CeO 2-15％ La 2O 3-2％ BaO-9％ Pt-1.2％ Rh-0.8％ | |||||||||||||
| HC | CO | NOx | HC | CO | NOx | HC | CO | NOx | HC | CO | NOx | HC | CO | NOx | |||
| 242 | 242 | 243 | 268 | 264 | 275 | 285 | 283 | 285 | 265 | 263 | 273 | 269 | 259 | 252 | |||
| 223 | 224 | 221 | 242 | 235 | 251 | 260 | 264 | 262 | 236 | 232 | 2 39 | 241 | 246 | 229 | |||
| 273 | 275 | 283 | 265 | 265 | 272 | 286 | 285 | 285 | 268 | 264 | 270 | 272 | 275 | 258 | |||
2, relevant comparative example
For further specifying the high temperature sintering resistant performance of citric acid sol-gel process three-way catalyst of the present invention, with traditional immersion process for preparing have the catalyst of identical chemical composition, and the high temperature resistant property and the sol-gel catalyst of the present invention of this catalyst compared.
(1) relevant comparative example 1:
1. get 25.2 gram Ce (NO
3)
36H
2O, 5.32 gram La (NO
3)
36H
2O, 10.2 gram Ba (NO
3)
2, with the water-soluble solution of 200ml, obtain mixed solution;
2. get γ-Al
2O
3(specific area is 195m
2/ g) powder 80 restrains, gained solution in the vacuum impregnation 1., and to be impregnated saturated rear in 110 ℃ of oven dry in 12 hours; Dipping carries out repeatedly with oven dry, until solution is all absorbed;
3. γ-the Al after 550 ℃ of roastings in 3 hours are flooded
2O
3
4. with 50ml dissolved in distilled water 3.2 gram H
2PtCl
6Rh (the NO of+1.4 grams
3)
3
5. use 3. gained material vacuum impregnation solution 3., 100 ℃ of air atmospheres oven dry in 12 hours again, dipping carries out repeatedly with oven dry then, all is absorbed until solution;
6. the above-mentioned powder of hydrogen reducing 6 hours under 550 ℃ of conditions can obtain catalyst fines.
With gained catalyst fines compressing tablet, granulation, can obtain the pellet type catalyst that granularity is 0.3～0.5mm.Gained catalyst component weight ratio is identical with the embodiment of the invention 1: Al
2O
3-80%, CeO
2-10%, La
2O
3-2%, BaO-6%, Pt-1.5%, Rh-0.5%.
(2) relevant comparative example 2: preparation process is with relevant comparative example 1, and difference is in γ-Al
2O
3The amount of taking is 70 grams, Ce (NO
3)
36H
2The O amount of taking is 50.4 grams, the weight ratio of constituents of last gained catalyst and the embodiment of the invention 2,6 identical: Al
2O
3-70%, CeO
2-20%, La
2O
3-2%, BaO-6%, Pt-1.5%, Rh-0.5%.
(3) relevant comparative example 3: preparation process is with relevant comparative example 1, and difference is in γ-Al
2O
3The amount of taking is 71 grams, Ce (NO
3)
36H
2The O amount of taking is 50.4 grams, La (NO
3)
36H
2The O amount of taking is 2.7 grams, and the weight ratio of constituents of gained catalyst is identical with the embodiment of the invention 3: Al
2O
3-71%, CeO
2-20%, La
2O
3-1%, BaO-6%, Pt-1.5%, Rh-0.5%.
(4) relevant comparative example 4: preparation process is with relevant comparative example 1, and difference is in γ-Al
2O
3The amount of taking is 68 grams, Ce (NO
3)
36H
2The O amount of taking is 50.4 grams, H
2PtCl
6The amount of taking is 6.3 grams, Rh (NO
3)
3The amount of taking is 2.8 grams, and the weight ratio of constituents of gained catalyst is identical with the embodiment of the invention 4: Al
2O
3-68%, CeO
2-20%, La
2O
3-2%, BaO-6%, Pt-3%, Rh-1%.
(5) relevant comparative example 5: making step is with relevant comparative example 1, and difference is in γ-Al
2O
3The amount of taking is 78 grams, H
2PtCl
6The amount of taking is 6.3 grams, Rh (NO
3)
3The amount of taking is 2.8 grams.The weight ratio of constituents of gained catalyst is identical with the embodiment of the invention 5: Al
2O
3-78%, CeO
2-10%, La
2O
3-2%, BaO-6%, Pt-3%, Rh-1%.
(6) relevant comparative example 6 making steps are with relevant comparative example 1, and difference is in γ-Al
2O
3The amount of taking is 72 grams, Ce (NO
3)
36H
2The O amount of taking is 38 grams, Ba (NO
3)
2The amount of taking is 15.3 grams.The weight ratio of constituents of gained catalyst is identical with the embodiment of the invention 7: Al
2O
3-72%, CeO
2-15%, La
2O
3-2%, BaO-9%, Pt-1.5%, Rh-0.5%.
(7) relevant comparative example 7 making steps are with relevant comparative example 1, and difference is in γ-Al
2O
3The amount of taking is 72.5 grams, Ce (NO
3)
36H
2The O amount of taking is 50.4 grams, La (NO
3)
36H
2The O amount of taking is 9.31 grams, Ba (NO
3)
2The amount of taking is 3.4 grams.The weight ratio of constituents of gained catalyst is identical with the embodiment of the invention 8: Al
2O
3-72.5%, CeO
2-20%, La
2O
3-3.5%, BaO-2%, Pt-1.5%, Rh-0.5%.
(8) relevant comparative example 8 making steps are with relevant comparative example 1, and difference is in γ-Al
2O
3The amount of taking is 72 grams, Ce (NO
3)
36H
2The O amount of taking is 38 grams, Ba (NO
3)
2The amount of taking is 15.3 grams, H
2PtCl
6The amount of taking is 2.52 grams, Rh (NO
3)
3The amount of taking is 2.24 grams.The weight ratio of constituents of gained catalyst is identical with the embodiment of the invention 9: Al
2O
3-72%, CeO
2-15%, La
2O
3-2%, BaO-9%, Pt-1.2%, Rh-0.8%.
The active testing of relevant comparative example the results are shown in Table 2.
The purification test result of infusion process catalyst under the table 2 simulated exhaust gas condition
| Catalyst | Initiation temperature (T 50) | |||||||||||
| Relevant comparative example 1 Al 2O 3-80％ CeO 2-10％ La 2O 3-2％ BaO-6％ Pt-1.5％ Rh-0.5％ | Relevant comparative example 2 Al 2O 3-70％ CeO 2-20％ La 2O 3-2％ BaO-6％ Pt-1.5％ Rh-0.5％ | Relevant comparative example 3 Al 2O 3-71％ CeO 2-20％ La 2O 3-1％ BaO-6％ Pt-1.5％ Rh-0.5％ | Relevant comparative example 4 Al 2O 3-68％ CeO 2-20％ La 2O 3-2％ BaO-6％ Pt-3％ Rh-1％ | |||||||||
| HC | CO | NOx | HC | CO | NOx | HC | CO | NOx | HC | CO | NOx | |
| Calcined catalyst not | 277 | 274 | 277 | 261 | 251 | 254 | 268 | 262 | 275 | 241 | 242 | 246 |
| 900 ℃ of roastings in 5 hours | 243 | 245 | 253 | 237 | 241 | 233 | 233 | 231 | 237 | 243 | 250 | 246 |
| 1200 ℃ of roastings in 2 hours | 317 | 321 | 315 | 295 | 293 | 297 | 291 | 289 | 292 | 305 | 301 | 298 |
| Initiation temperature (T 50) | ||||||||||||
| Relevant comparative example 5 Al 2O 3-78％ CeO 2-10％ La 2O 3-2％ BaO-6％ Pt-3％ Rh-1％ | Relevant comparative example 6 Al 2O-72％ CeO 2-15％ La 2O 3-2％ BaO-9％ Pt-1.5％ Rh-0.5％ | Relevant comparative example 7 Al 2O 3-72.5％ CeO 2-20％ La 2O 3-3.5％ BaO-2％ Pt-1.5％ Rh-0.5％ | Relevant comparative example 8 Al 2O 3-72％ CeO 2-15％ La 2O 3-2％ BaO-9％ Pt-1.2％ Rh-0.8％ | ||||||||
| HC | CO | NOx | HC | CO | NOx | HC | CO | NOx | HC | CO | NOx |
| 245 | 241 | 242 | 263 | 254 | 255 | 265 | 265 | 270 | 267 | 258 | 250 |
| 241 | 244 | 241 | 240 | 245 | 244 | 239 | 234 | 241 | 240 | 247 | 231 |
| 293 | 296 | 302 | 291 | 303 | 300 | 298 | 294 | 301 | 302 | 299 | 301 |
The result of table 1 and table 2 shows that after through 1200 ℃ of high-temperature roastings, the initiation temperature of relevant comparative example catalyst will significantly improve apparently higher than the initiation temperature of embodiment of the invention catalyst, is unfavorable for effective purification of vehicle exhaust.Illustrate and adopt the catalyst of the present invention's preparation to have good high temperature sintering resistant ability.
Claims (4)
1. a sol-gel process prepares the method for triple effect tail-gas catalyst, it is characterized in that:
Get the soluble-salt water dissolving of Al, Ce, La, Ba, obtain mixed solution; Under stirring condition, slowly add in described mixed solution, to solation as complexing agent the citric acid alcoholic solution; With described colloidal sol drying, roasting obtains carrier material again; The soluble-salt aqueous solution vacuum impregnation of Pt and Rh is on carrier material, and dry, and hydrogen reducing namely gets catalyst fines; The soluble-salt weight ratio of described citric acid and Al, Ce, La, Ba is: 120～500: 510～670; The soluble-salt nitrate form Al (NO of described Al, Ce, La, Ba
3)
39H
2O, Ce (NO
3)
36H
2O, La (NO
3)
36H
2O, Ba (NO
3)
2The weight ratio of addition is: 480～590: 25～52: 2.6～10: 3.4～17; Described Pt and the Rh total content in catalyst is 1%～4%, and both weight ratios are: 1.5～3: 1.
2. according to the described method of claim 1, it is characterized in that: described Al, Ce, La, Ba soluble-salt composition adopt the form of nitrate to add.
3. according to the described method of claim 1, it is characterized in that: it is 30 ℃～50 ℃ times 2～5 hours that described colloidal sol becomes the stirring condition in the glue process, is stirred to into glue again under 70 ℃～90 ℃; Mixing speed is 300-400r/min.
4. according to the described method of claim 1, it is characterized in that: the roasting condition of dry back colloidal sol is: 500 ℃～600 ℃, 3～6 hours.
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|---|---|---|---|
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|---|---|---|---|
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| Publication Number | Publication Date |
|---|---|
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| CN104162420A (en) * | 2014-08-13 | 2014-11-26 | 内蒙古自治区冶金研究院 | Preparation method of multi-element rare earth oxygen storage and release material in three-effect catalyst of automobile emission purification |
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| CN111584885B (en) * | 2020-05-15 | 2022-05-10 | 无锡威孚高科技集团股份有限公司 | Preparation method of binary or multi-element noble metal catalyst for fuel cell |
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| CN104162420A (en) * | 2014-08-13 | 2014-11-26 | 内蒙古自治区冶金研究院 | Preparation method of multi-element rare earth oxygen storage and release material in three-effect catalyst of automobile emission purification |
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