CN115382540A - Preparation method of modified alumina carrier supported noble metal catalyst for lean burn CNG - Google Patents
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- 239000003054 catalyst Substances 0.000 title claims abstract description 53
- 229910000510 noble metal Inorganic materials 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 239000002002 slurry Substances 0.000 claims abstract description 54
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 28
- 238000000576 coating method Methods 0.000 claims abstract description 28
- 239000011230 binding agent Substances 0.000 claims abstract description 25
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000000758 substrate Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 24
- 238000005303 weighing Methods 0.000 claims description 23
- 229920002678 cellulose Polymers 0.000 claims description 10
- 239000001913 cellulose Substances 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 2
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 2
- 239000001099 ammonium carbonate Substances 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 6
- 230000003197 catalytic effect Effects 0.000 abstract description 6
- 150000002910 rare earth metals Chemical class 0.000 abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 abstract description 6
- 239000011593 sulfur Substances 0.000 abstract description 6
- 238000011068 loading method Methods 0.000 abstract description 3
- 239000012876 carrier material Substances 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 231100000572 poisoning Toxicity 0.000 abstract description 2
- 230000000607 poisoning effect Effects 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 24
- 230000032683 aging Effects 0.000 description 12
- 239000003345 natural gas Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 7
- 238000002156 mixing Methods 0.000 description 4
- 238000004537 pulping Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052684 Cerium Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000003949 liquefied natural gas Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000629 steam reforming Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/44—Palladium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0228—Coating in several steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
- B01J37/031—Precipitation
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Abstract
The invention provides a preparation method of a modified alumina carrier supported noble metal catalyst for lean burn CNG, which is characterized in that Al is added with Zr 2 O 3 Modified and Al after modification 2 O 3 Coating a noble metal coating on a carrier, which comprises the following specific steps: according to Zr-Al 2 O 3 (ii) a A rare earth element; a noble metal; an alkaline precipitant; a binder; preparing bottom layer slurry and upper layer slurry from celluloseThe slurry of (a) is coated on a substrate. The catalyst prepared by the method fully exerts the rare earth and Zr-Al by adding rare earth metal and optimizing the proportion of the amount of the bottom layer slurry to the amount of the upper layer slurry 2 O 3 The catalytic performance is improved by the synergistic effect of the carrier; in addition, zr-Al modified due to Zr 2 O 3 The carrier material has the performances of hydrothermal resistance, sulfur poisoning resistance and the like, and the catalyst obtained after loading the noble metal has good hydrothermal stability, sulfur resistance and the like.
Description
Technical Field
The invention relates to a preparation method of a modified alumina carrier supported noble metal catalyst for lean burn CNG, in particular to optimization of a coating.
Background
Natural gas vehicles are mainly classified into Compressed Natural Gas (CNG) vehicles and Liquefied Natural Gas (LNG) vehicles. The CNG automobile fuel compresses natural gas, stores the compressed natural gas in a vehicle-mounted high-pressure bottle, reduces the pressure of the natural gas through a pressure reducer and supplies the compressed natural gas to an internal combustion engine, and the storage process is simple.
The natural gas is mixed with air in the engine, compared with diesel oil and gasoline, the natural gas is mixed more uniformly and combusted more fully, and compared with an automobile and a fuel oil automobile, the emission of various pollutants in CNG automobile tail gas is greatly reduced, but unburned CH in the tail gas 4 The content is still large. The main pollutant in the tail gas is CH under the condition of CNG automobile theoretical air-fuel ratio 4 、NO X And CO. The purification requirement of the theoretical air-fuel ratio CNG automobile exhaust is higher, the requirement on the catalyst is higher than that of the gasoline automobile exhaust purification catalyst, and the purification of each component in the exhaust can be effectively finished only by a high-performance three-way catalyst.
In recent years, due to the increase of the holding amount of lean-burn CNG automobiles, unburned CH in exhaust gas 4 Will cause great pressure on the environment, CH 4 Catalytic oxidation catalysts can be broadly classified into noble metal catalysts and non-noble metal catalysts. Compared with non-noble metal catalyst, noble metal catalyst has better low-temperature activity and high-temperature stability, so that the noble metal catalyst is widely applied to catalytic oxidation of methane, wherein the Pd supported catalyst hasHas the highest methane catalytic activity, but Pd/Al 2 O 3 The catalyst has poor thermal stability, is easy to inactivate at high temperature, has poor water-resistant thermal stability, is not sulfur-resistant, and has high noble metal content, so that the cost is high.
Disclosure of Invention
In order to solve the problems of poor water-resistant and thermal stability, poor sulfur resistance and high content of noble metal of the existing catalyst, the preparation method of the catalyst for the lean-burn CNG (compressed natural gas) by loading the noble metal on the modified alumina carrier is provided.
The specific scheme is as follows:
preparation method of modified alumina carrier supported noble metal catalyst for lean burn CNG (compressed natural gas), al 2 O 3 Modified by Zr, modified Al 2 O 3 The surface of the carrier is coated with a coating, the coating comprises noble metal and rare earth elements, and the preparation method comprises the following steps:
preparing a bottom layer slurry of the coating:
the materials are prepared according to the following mass percentages: zr-Al 2 O 3 90 to 95 percent; 0.5 to 1 percent of rare earth element; 1% -2% of noble metal m; 1-2% of alkaline precipitant; 2 to 3 percent of binder; 0.1 to 0.2 percent of cellulose; weighing the materials according to the mass percentage, putting the materials into a barrel, stirring, and stopping stirring until the viscosity required by coating is reached;
preparing a coating upper layer slurry:
the materials are prepared according to the following mass percentages: zr-Al 2 O 3 90 to 95 percent; 1 to 2 percent of rare earth element; 0.2 to 2 percent of noble metal n; 1-2% of alkaline precipitant; 2 to 3 percent of binder; 0.01 to 0.1 percent of cellulose; weighing the materials according to the mass percentage, putting the materials into a barrel, stirring, and stopping stirring until the viscosity required by coating is reached;
coating the prepared bottom layer slurry and the prepared upper layer slurry on a catalyst, wherein the mass ratio of the bottom layer slurry to the upper layer slurry is as follows: upper layer slurry = (3 to 1.5): 1.
preferably, the oxide content of each component of the bottom layer slurry is as follows:
Zr-Al 2 O 3 30 to 50 percent; 30 to 50 percent of rare earth elements; m is 10 to 20 percent of noble metal; 30-60% of alkaline precipitator; 5 to 20 percent of binder; 0.5 to 3 percent of cellulose, wherein Zr-Al 2 O 3 The oxide content ratio of the binder is Zr-Al 2 O 3 : adhesive =4.
Preferably, the oxide content of each component of the upper layer slurry is as follows:
Zr-Al 2 O 3 30 to 50 percent; 30 to 50 percent of rare earth element; m is 10 to 20 percent of noble metal; 30-60% of alkaline precipitant; 5 to 20 percent of binder; 0.5 to 3 percent of cellulose, wherein Zr-Al 2 O 3 The oxide content ratio of the binder is Zr-Al 2 O 3 : adhesive =4.
Preferably, the noble metal m in the bottom layer slurry is Pd, the noble metal n in the upper layer slurry is Pt, and Pd and Pt are used as active components of the catalyst to play a role in catalytic oxidation on the tail gas.
Preferably, the rare earth elements in the bottom layer slurry and the upper layer slurry are one or a mixture of more of Y, ce, la and Ba, and the rare earth elements are doped in the bottom layer slurry and the upper layer slurry and used as auxiliaries to play roles in storing and releasing oxygen, stabilizing a carrier coating, promoting water gas conversion reaction and steam reforming reaction, changing reaction kinetics and the like.
Preferably, the alkaline precipitant is Ba (OH) 2 One or a mixture of more of ammonia water and ammonium bicarbonate.
Preferably, the cellulose in the bottom layer slurry and the top layer slurry is HHBR250.
Has the advantages that:
the invention provides a preparation method of a modified alumina carrier supported noble metal catalyst for lean burn CNG, which further improves the low temperature activity of the noble metal catalyst by preparing a bottom layer slurry and an upper layer slurry and coating the bottom layer slurry and the upper layer slurry on the catalyst, wherein Pd and rare earth metal are added into the bottom layer slurry, pt and rare earth metal are added into the upper layer slurry, and the effect of storing and releasing oxygen, stabilizing a carrier coating and promoting water gas conversion reaction is achieved on the one hand by adding rare earth metal, on the other hand, the noble metal can be reducedThe use of metals; secondly, the ratio of the bottom layer slurry amount to the upper layer slurry amount is optimized, so that the rare earth and the Zr-Al are fully exerted 2 O 3 The catalyst performance is improved under the synergistic action of the carrier; in addition, zr-Al modified due to Zr 2 O 3 The carrier material has the performances of hydrothermal resistance, sulfur poisoning resistance and the like, and the catalyst obtained after loading the noble metal has good hydrothermal stability, sulfur resistance and the like, thereby being more beneficial to the application of lean burn CNG.
Drawings
FIG. 1 is a graph of hydrothermal aging first pass test performance for the catalyst prepared in example 1.
Figure 2 is a graph of hydrothermal aging second pass test performance for the catalyst prepared in example 1.
FIG. 3 is a graph of the fresh first pass performance of the catalyst prepared in example 2.
Figure 4 is a graph of the fresh second pass performance of the catalyst prepared in example 2.
Figure 5 is a graph of hydrothermal aging first pass test performance for the catalyst prepared in example 2.
Fig. 6 is a graph of hydrothermal aging second pass test performance for the catalyst prepared in example 2.
FIG. 7 is a graph of the fresh first pass performance of the catalyst prepared in example 3.
Figure 8 is a graph of the fresh second pass performance of the catalyst prepared in example 3.
Figure 9 is a graph of hydrothermal aging first pass test performance for the catalyst prepared in example 3.
Figure 10 is a graph of hydrothermal aging second pass test performance for the catalyst prepared in example 3.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
Example 1:
a preparation method of a modified alumina carrier supported noble metal catalyst for lean burn CNG comprises the following steps:
(1) Preparation of the coating
The materials are prepared according to the following mass percentages:
Zr-Al 2 O 3 92.1％；Pd 1％；Ba(OH) 2 4.134 percent; 2.7 percent of binder; HHBR 250.066%;
mixing and pulping: according to Zr-Al 2 O 3 Weighing the materials according to the mass percentage, putting the materials into a barrel, and uniformly stirring; weighing a Pd solution, dropwise adding the Pd solution into a barrel, and stirring for 5 hours; weighing Ba (OH) 2 Adding into a barrel, stirring for 5h; weighing the binder, adding the binder into a barrel, and stirring for 30min; HHBR250 was weighed into a bucket and stirred for 2h to the appropriate coating viscosity.
(2) The slurry was coated on a catalyst and tested for catalyst performance
The hydrothermal aging first test was performed at 850 ℃ for 50h, and the test results are shown in FIG. 1:
the hydrothermal aging test is carried out for the second time at 850 ℃ for 50h, and the test result is shown in figure 2:
example 2:
a preparation method of a modified alumina carrier loaded noble metal catalyst for lean-burn CNG comprises the following steps:
(1) The materials are prepared according to the following mass percentage:
Zr-Al 2 O 3 92.1％；Pd 1％；Ba(OH) 2 2.264 percent; 2.7 percent of binder; HHBR 250.066%; 1.87 percent of Ce;
mixing and pulping: according to Zr-Al 2 O 3 Weighing the materials according to the mass percentage, putting the materials into a barrel, and uniformly stirring; weighing Ce, and adding into a barrel to stir for 50min; weighing a Pd solution, dropwise adding the Pd solution into a barrel, and stirring for 5 hours; weighing Ba (OH) 2 Adding into a barrel, stirring for 5h; weighing the binder, adding the binder into a barrel, and stirring for 30min; HHBR250 was weighed into a bucket and stirred for 2h to the appropriate coating viscosity.
(2) The slurry was coated on a catalyst and tested for catalyst performance
The fresh state is the first pass, and the test result is shown in FIG. 3;
the fresh state for the second pass, the test results are shown in fig. 4;
performing a hydrothermal aging first test at 850 ℃ for 50h, wherein the test result is shown in FIG. 5;
carrying out hydrothermal aging for the second time at 850 ℃ for 50h, wherein the test result is shown in FIG. 6;
example 3:
a preparation method of a modified alumina carrier supported noble metal catalyst for lean burn CNG comprises the following steps:
preparing double-layer slurry:
(1) Preparing a bottom layer slurry:
the materials are prepared according to the following mass percentages: zr-Al 2 O 3 92.1％；Pd 1％；Ba(OH) 2 2.264 percent; 2.7 percent of binder; HHBR 250.066%; 1.87 percent of Ce;
mixing and pulping: according to Zr-Al 2 O 3 Weighing the materials according to the mass percentage, putting the materials into a barrel, and uniformly stirring; weighing Ce, and adding into a barrel to stir for 50min; weighing a Pd solution, dropwise adding the Pd solution into a barrel, and stirring for 5 hours; weighing Ba (OH) 2 Adding into a barrel, stirring for 5h; weighing the binder, adding the binder into a barrel, and stirring for 30min; HHBR250 was weighed into a bucket and stirred for 2h to the appropriate coating viscosity.
(2) Preparing upper slurry:
the materials are prepared according to the following mass percentage: zr-Al 2 O 3 92.1％；Pt 1％；Ba(OH) 2 2.264 percent; 2.7 percent of binder; HHBR 250.066%; 1.87 percent of Ce;
mixing and pulping: according to Zr-Al 2 O 3 Weighing the materials according to the mass percentage, putting the materials into a barrel, and uniformly stirring; weighing Ce, and adding the Ce into a barrel to stir for 50min; weighing a Pt solution, dropwise adding the Pt solution into a barrel, and stirring for 5 hours; weighing Ba (OH) 2 Adding into a barrel, stirring for 5h; weighing the binder, adding the binder into a barrel, and stirring for 30min; HHBR250 was weighed into a bucket and stirred for 2h to the appropriate coating viscosity.
(3) Coating the prepared bottom layer slurry and the prepared upper layer slurry on a catalyst, and carrying out performance detection on the final catalyst;
the test result of the first test of the fresh state is shown in FIG. 7;
the fresh state is tested for the second time, and the test result is shown in FIG. 8;
performing a hydrothermal aging first test at 850 ℃ for 50h, wherein the test result is shown in FIG. 9;
the hydrothermal aging test was performed for the second time at 850 ℃ for 50h, and the test results are shown in fig. 10.
From the three examples, the Pd-supported catalyst can further improve the low-temperature catalytic performance of the catalyst, and the results of fig. 7, 8, 9 and 10 show that the CO conversion efficiency of the finally obtained catalyst is further improved by preparing the bottom layer slurry and the upper layer slurry and coating the substrate
As a further improvement, the above-mentioned is only a preferred embodiment of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A preparation method of a modified alumina carrier supported noble metal catalyst for lean burn CNG is characterized in that Al 2 O 3 Modified by Zr, modified Al 2 O 3 The surface of the carrier is coated with a coating, the coating comprises noble metal and rare earth elements, and the preparation method comprises the following steps:
preparing a bottom layer slurry of the coating:
the materials are prepared according to the following mass percentages: zr-Al 2 O 3 90 to 95 percent; 0.5 to 1 percent of rare earth element; 1% -2% of noble metal m; 1-2% of alkaline precipitant; 2 to 3 percent of binder; 0.1 to 0.2 percent of cellulose; weighing the materials according to the mass percentage, putting the materials into a barrel, stirring, and stopping stirring until the viscosity required by coating is reached;
preparing a coating upper layer slurry:
the materials are prepared according to the following mass percentages: zr-Al 2 O 3 90 to 95 percent; 1% -2% of rare earth elements; 0.2 to 2 percent of noble metal n; 1-2% of alkaline precipitant; 2 to 3 percent of binder; 0.01 to 0.1 percent of cellulose; weighing the materials according to the mass percentage, putting the materials into a barrel for stirring, and stopping stirring until the viscosity required by coating is reached;
coating the prepared bottom layer slurry and the prepared upper layer slurry on a substrate, wherein the coating mass ratio of the bottom layer slurry to the upper layer slurry is as follows: upper layer slurry = (3-1.5): 1.
2. the method for preparing the modified alumina-supported noble metal catalyst for lean burn CNG according to claim 1, wherein the oxide content of each component of the primer slurry is as follows:
Zr-Al 2 O 3 30 to 50 percent; 30 to 50 percent of rare earth element; m is 10 to 20 percent of noble metal; 30-60% of alkaline precipitant; 5 to 20 percent of binder; 0.5 to 3 percent of cellulose, wherein Zr-Al 2 O 3 The oxide content ratio of the binder is Zr-Al 2 O 3 : adhesive =4.
3. The method for preparing the modified alumina-supported noble metal catalyst for lean burn CNG according to claim 1, wherein the upper layer slurry comprises the following components in percentage by weight:
Zr-Al 2 O 3 30 to 50 percent; 30 to 50 percent of rare earth element; m is 10 to 20 percent of noble metal; 30-60% of alkaline precipitant; 5 to 20 percent of binder; 0.5 to 3 percent of cellulose, wherein Zr-Al 2 O 3 The oxide content ratio of the binder is Zr-Al 2 O 3 : adhesive =4.
4. The method as claimed in claim 1, wherein the noble metal m in the bottom layer slurry is Pd, and the noble metal n in the top layer slurry is Pt.
5. The method for preparing the catalyst, according to claim 1, wherein the rare earth elements in the bottom layer slurry and the top layer slurry are one or a mixture of Y, ce, la and Ba.
6. The method as claimed in claim 1, wherein the basic precipitant is Ba (OH) 2 One or a mixture of more of ammonia water and ammonium bicarbonate.
7. The method as claimed in claim 1, wherein the cellulose in the bottom layer slurry and the top layer slurry is HHBR250.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103189138A (en) * | 2010-09-02 | 2013-07-03 | 巴斯夫欧洲公司 | Catalyst for gasoline lean burn engines with improved no oxidation activity |
| US20130345049A1 (en) * | 2011-03-10 | 2013-12-26 | Isao Chinzei | Exhaust gas purification catalyst |
| CN106268859A (en) * | 2016-08-04 | 2017-01-04 | 桐城市宇洁机动车尾气检测有限公司 | A kind of natural gas and auto tail gas processes catalyst and preparation method thereof |
| CN106890642A (en) * | 2017-02-13 | 2017-06-27 | 无锡威孚环保催化剂有限公司 | Catalyst and preparation method thereof for processing benezene material in industrial waste gas |
| CN107715875A (en) * | 2017-11-01 | 2018-02-23 | 台州欧信环保净化器有限公司 | A kind of GPF four-way catalysts and preparation method thereof |
| CN111997718A (en) * | 2020-08-18 | 2020-11-27 | 无锡威孚环保催化剂有限公司 | Post-processing method applied to diesel-natural gas dual-fuel vehicle |
| CN113231062A (en) * | 2021-05-08 | 2021-08-10 | 无锡威孚环保催化剂有限公司 | Pt-containing gasoline car three-way catalyst and preparation method thereof |
| CN113304745A (en) * | 2021-06-04 | 2021-08-27 | 中自环保科技股份有限公司 | Pt-Pd-Rh ternary catalyst and preparation method thereof |
-
2022
- 2022-07-29 CN CN202210908141.8A patent/CN115382540A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103189138A (en) * | 2010-09-02 | 2013-07-03 | 巴斯夫欧洲公司 | Catalyst for gasoline lean burn engines with improved no oxidation activity |
| US20130345049A1 (en) * | 2011-03-10 | 2013-12-26 | Isao Chinzei | Exhaust gas purification catalyst |
| CN106268859A (en) * | 2016-08-04 | 2017-01-04 | 桐城市宇洁机动车尾气检测有限公司 | A kind of natural gas and auto tail gas processes catalyst and preparation method thereof |
| CN106890642A (en) * | 2017-02-13 | 2017-06-27 | 无锡威孚环保催化剂有限公司 | Catalyst and preparation method thereof for processing benezene material in industrial waste gas |
| CN107715875A (en) * | 2017-11-01 | 2018-02-23 | 台州欧信环保净化器有限公司 | A kind of GPF four-way catalysts and preparation method thereof |
| CN111997718A (en) * | 2020-08-18 | 2020-11-27 | 无锡威孚环保催化剂有限公司 | Post-processing method applied to diesel-natural gas dual-fuel vehicle |
| CN113231062A (en) * | 2021-05-08 | 2021-08-10 | 无锡威孚环保催化剂有限公司 | Pt-containing gasoline car three-way catalyst and preparation method thereof |
| CN113304745A (en) * | 2021-06-04 | 2021-08-27 | 中自环保科技股份有限公司 | Pt-Pd-Rh ternary catalyst and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| LOTT, P ET AL.: ""Understanding sulfur poisoning of bimetallic Pd-Pt methane oxidation catalysts and their regeneration"", 《APPLIED CATALYSIS B-ENVIRONMENTAL》, vol. 278, pages 160 - 4 * |
| 胡伟等: ""Zr的添加对稀燃天然气汽车尾气净化催化剂Pd-Pt/Al2O3性能的影响"", 《物理化学学报》, vol. 31, no. 9, pages 1772 * |
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