CN115920885A - Preparation method of catalyst for purifying automobile exhaust - Google Patents
Preparation method of catalyst for purifying automobile exhaust Download PDFInfo
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- CN115920885A CN115920885A CN202211682715.0A CN202211682715A CN115920885A CN 115920885 A CN115920885 A CN 115920885A CN 202211682715 A CN202211682715 A CN 202211682715A CN 115920885 A CN115920885 A CN 115920885A
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- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 7
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The application relates to a preparation method of a catalyst for purifying automobile exhaust, which comprises the following steps: dissolving a P123 template in a solvent to obtain a template solution; adding Ce (NO) 3 ) 3 、Zr(NO 3 ) 4 、Al(NO 3 ) 3 、Pd(NO 3 ) 2 、(NH 3 ) 4 Pt(NO 3 ) 2 、Rh(NO 3 ) 3 At least one ofAdding nitrate of the sexual element into the template solution to obtain a mixed solution; evaporating the solvent of the mixed solution to obtain a solid; and roasting the solid to obtain the catalyst for purifying the automobile exhaust. According to the preparation method of the catalyst for purifying the automobile exhaust, the catalyst for purifying the automobile exhaust is prepared by selecting the P123 as the template agent, and the P123 has the effects of high mesopore regularity and orderliness and easy control of pore size distribution and pore size, so that the catalyst prepared by the method has the effects of good catalytic activity, high thermal stability and good repeatability.
Description
Technical Field
The application relates to the field of energy conservation and emission reduction, in particular to automobile exhaust purification.
Background
In recent years, with the rapid development of economy, the quantity of automobiles in China is increased year by year. According to statistics, the automobile keeping quantity in China reaches 3.72 hundred million by the end of 2020. The rapid increase of the production and usage of automobiles also inevitably brings about severe problems of air pollution and the like. At present, harmful substances such as CO, HC and NOx in automobile exhaust are converted into CO by installing a three-way catalytic device 2 、H 2 O and N 2 Thereby greatly reducing the environmental pollution and improving the atmospheric quality.
Three-way catalysts generally consist of an active component, a coating and a catalyst support. The catalyst support is typically a honeycomb ceramic or metal support. The support is coated with a thin catalyst coating, which is usually composed of an oxide material (such as alumina), an oxygen storage material, and a noble metal active component dispersed on the surface. The active component is mainly a platinum group noble metal (platinum Pt, rhodium Rh, palladium Pd). In the process of developing the catalyst, the high dispersibility and stability of the noble metal nanoparticles are key technologies in the preparation of the catalyst, on one hand, the use amount of the noble metal in the catalyst is controlled, the cost of the catalyst is reduced, and on the other hand, the specific surface area of the noble metal nanoparticles is increased, and the catalytic activity of the noble metal nanoparticles is enhanced.
The reduction of noble metal resources, the increase of automobile holding capacity and the stricter and stricter emission regulations make the automobile three-way catalyst face the test of reducing the noble metal content and improving the activity and thermal stability of the catalyst. At present, the preparation of the three-way catalyst is mainly carried out in two steps, namely, firstly, a precious metal carrier is prepared by methods such as a coprecipitation method/hydrothermal method, and then, precious metal is loaded on the carrier by an isovolumetric impregnation method. The preparation process has long flow, active components are easy to lose, and the catalyst activity is not high; and the noble metal is easy to sinter, the thermal stability is poor and the repeatability is poor due to multiple drying and roasting in the preparation process.
Disclosure of Invention
The embodiment of the application provides a preparation method of a catalyst for purifying automobile exhaust, which aims to solve the technical problems of low catalytic activity and poor repeatability in the preparation of the conventional three-way catalyst for purifying automobile exhaust.
The embodiment of the application provides a preparation method of a catalyst for purifying automobile exhaust, which comprises the following steps:
dissolving a P123 template in a solvent to obtain a template solution;
adding Ce (NO) 3 ) 3 、Zr(NO 3 ) 4 、Al(NO 3 ) 3 、Pd(NO 3 ) 2 、(NH 3 ) 4 Pt(NO 3 ) 2 、Rh(NO 3 ) 3 Adding at least one of the nitrate of the modified element and the nitrate of the modified element into the template solution to obtain a mixed solution;
evaporating the solvent of the mixed solution to obtain a solid;
and roasting the solid to obtain the catalyst for purifying the automobile exhaust.
In some embodiments of the present application, the solvent is ethanol or a mixture of ethanol and water.
In some embodiments of the present application, the solvent is a mixed solution of ethanol and water at a volume ratio of 4.
In some embodiments of the present application, the P123 templating agent is dissolved in the solvent, and 60-80mL of solvent is dissolved per 1g of P123 templating agent.
In some embodiments of the present application, the modifying element is at least one of magnesium and calcium.
In some embodiments of the present application, the P123 template is present in an amount of 150 to 200g per 1mol of metal atom in the mixed solution.
In some embodiments of the present application, the evaporation of the solvent of the mixed solution is performed in an environment having a temperature of 50 to 80 ℃ and a relative humidity of 20 to 50%.
In some embodiments of the present application, the temperature of the firing is 500-800 ℃.
In some embodiments of the present application, the firing lasts 12-60 hours.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the preparation method of the catalyst for purifying the automobile exhaust, the catalyst for purifying the automobile exhaust is prepared by selecting the P123 as the template, and the template prepared by the method has the effects of good catalytic activity, high thermal stability and good repeatability because the P123 has the effects of high mesopore regularity and orderliness and easy control of pore size distribution and pore size.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a preparation method of a catalyst for purifying automobile exhaust provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.
Unless otherwise specifically noted, terms used herein are to be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or can be prepared by an existing method.
The preparation of the existing three-way catalyst for purifying the automobile exhaust has the technical problems of low catalytic activity and poor repeatability.
In order to solve the technical problems, the general idea of the technical scheme provided by the embodiment of the application is as follows:
an embodiment of the present application provides a method for preparing a catalyst for purifying automobile exhaust, please refer to fig. 1, where the method for preparing the catalyst for purifying automobile exhaust includes the following steps:
s1: dissolving a P123 template in a solvent to obtain a template solution;
s2: ce (NO) 3 ) 3 、Zr(NO 3 ) 4 、Al(NO 3 ) 3 、Pd(NO 3 ) 2 、(NH 3 ) 4 Pt(NO 3 ) 2 、Rh(NO 3 ) 3 Adding at least one of nitrate of modified elements and the template solution to obtain a mixed solution;
s3: evaporating the solvent of the mixed solution to obtain a solid;
s4: and roasting the solid matter to obtain the catalyst for purifying the automobile exhaust.
It will be appreciated by those skilled in the art that the P123 templating agent is a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer having the formula EO20PO70EO20.
Step S3 may be carried out by conventional means in the art, such as natural evaporation, evaporation through an oven.
In the evaporation process of the step S3, as the solvent is gradually evaporated and reduced, gel is firstly formed, and as the solvent in the gel is further evaporated, the gel gradually forms the solid.
The main purpose of adding the template agent is to disperse each nitrate in the step S2 in the template agent, and in the subsequent roasting process, the nitrate can be decomposed into oxides of corresponding elements and oxide nanoparticles with catalytic activity are formed; the template agent forms carbonized residues after roasting to form a framework for forming the catalyst for purifying the automobile exhaust, and oxide nano particles are attached to the framework and are not easy to agglomerate.
The P123 is a triblock copolymer (PEO-PPO-PEO), is a non-ionic template agent, has good affinity, has a hydrophilic PEO section and a hydrophobic PPO section, and can spontaneously form a spherical micelle structure with the hydrophobic PPO section as an inner core and the hydrophilic PEO section as an outer shell in a solution system to further obtain spherical gel particles. In addition, the mesoporous silicon dioxide can also play a role of a pore-forming agent and promote the formation of a nano mesoporous structure.
According to the method, the catalyst for purifying the automobile exhaust is prepared by selecting the P123 as the template, and the P123 has the effects of high pore regularity and orderliness and easily controlled pore size distribution and pore size, so that the template prepared by the method has the effects of good catalytic activity, high thermal stability, good catalytic activity, high thermal stability and good repeatability.
In some embodiments of the present application, the solvent is ethanol or a mixture of ethanol and water.
Those skilled in the art will appreciate that ethanol, or an aqueous solution of ethanol, may be relatively effective in dissolving P123.
In some embodiments of the present application, the solvent is a mixed solution of ethanol and water at a volume ratio of 4.
The volume ratio of the mixture of ethanol and water is controlled to be greater than or equal to 4, and the volume ratio has the advantages that the solvent is suitable for the evaporation hydrolysis time in the range, and the cavity is less likely to form.
In some embodiments of the present application, the P123 templating agent is dissolved in the solvent, and 60-80mL of solvent is dissolved per 1g of P123 templating agent.
The purpose of dissolving 1gP123 in each 60-80mL of solvent is to control the concentration of P123, and the beneficial effect of controlling the concentration of P123 in the above range is that the concentration of the template agent is lower than the critical micelle concentration, and the homogeneous and porous catalyst is easy to prepare.
In some embodiments of the present application, the modifying element is at least one of magnesium and calcium.
The magnesium and calcium elements are selected for modification, so that the crystal lattice defects and oxygen vacancies can be generated, the improvement of the mobile phase of oxygen ions is facilitated, and the reaction performance is improved.
In some embodiments of the present application, the P123 template is present in an amount of 150 to 200g per 1mol of metal atom in the mixed solution.
It will be understood by those skilled in the art that the mass of the P123 templating agent per 1mol of metal atom can be controlled by controlling the amount of all nitrates and the amount of templating agent solution added in step S2.
The beneficial effect of the presence of 150-200g of P123 template agent per 1mol of metal atoms in the mixed solution is that the catalyst prepared in the range has small crystal grain size, large specific surface area and large pore volume and pore diameter.
In some embodiments of the present application, the evaporation of the solvent of the mixed solution is performed in an environment having a temperature of 50 to 80 ℃ and a relative humidity of 20 to 50%.
In some embodiments of the present application, the temperature of the firing is 500-800 ℃.
In some embodiments of the present application, the firing lasts 12-60 hours.
The present application is further illustrated with reference to specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application. The experimental methods without specifying specific conditions in the following examples were generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the usual international standards, to the conventional conditions or to the conditions recommended by the manufacturer.
Example 1
The embodiment provides a preparation method of a catalyst for purifying automobile exhaust, which comprises the following steps:
first, 2g of P123 template was dissolved in 120mL of anhydrous ethanol, and the solution was stirred continuously for 2 hours to prepare a template solution, and then Ce (NO) was added 3 ) 3 ·6H 2 O、Zr(NO 3 ) 4 ·5H 2 O、Al(NO 3 ) 3 ·9H 2 O、(NH 3 ) 4 Pt(NO 3 ) 2 And Mg (NO) 3 ) 2 ·6H 2 And adding the template agent solution into the O, stirring for 2 hours, transferring the formed mixed solution into a drying oven, and evaporating the solvent for 12 hours at 50 ℃ and the relative humidity of 20% to obtain a solid. And finally, roasting the solid at the temperature rise rate of 3 ℃ for min-1 and 800 ℃ for 3 hours to obtain the catalyst for purifying the automobile exhaust.
Evaluation of catalyst Activity: the catalyst activity evaluation was carried out on a fixed bed reactor, and fresh and aged catalyst activity evaluation was carried out in a simulated atmosphere. Evaluation atmosphere conditions: NO (300 ppm), CO 2 (15％)、H 2 O(10％)、C 3 H 6 (300ppm)、C 3 H 8 (150 ppm), CO (1.2%) and N as carrier gas 2 The heating rate is 10 ℃/min, and the airspeed is 40000h -1 . In the following table, the fresh catalyst refers to the catalyst for purifying automobile exhaust gas prepared in this example. The aged catalyst refers to a fresh catalyst after being aged. Aging at 1000 deg.C for 10h,10% 2 And O, performing hydrothermal aging. Light-off temperature T50 of catalyst: the temperature corresponding to the exhaust gas conversion rate of 50% is used as an index for evaluating the light-off activity of the catalyst, and the smaller the T50 value is, the better the catalytic activity is. HC-T50 (. Degree. C.), CO-T50 (. Degree. C.), NO-T50 (. Degree. C.) refer to temperatures at which the conversion of CO, HC, and NO as exhaust gas reaches 50%, respectively. The results are as follows:
| catalyst and process for producing the same | HC-T50(℃) | CO-T50(℃) | NO-T50(℃) |
| Fresh catalyst | 280 | 220 | 285 |
| Aged catalyst | 350 | 289 | 384 |
Example 2
The embodiment provides a preparation method of a catalyst for purifying automobile exhaust, which comprises the following steps:
first, 3g of P123 template was dissolved in 240mL of a mixed solution of anhydrous ethanol and water at a volume ratio of 4. Thereafter, ce (NO) is added 3 ) 3 ·6H 2 O、Zr(NO 3 ) 4 ·5H 2 O、Al(NO 3 ) 3 ·9H 2 O、Pd(NO 3 ) 2 And Ca (NO) 3 ) 2 ·4H 2 And adding the template agent solution into the O, stirring for 4 hours, transferring the formed mixed solution into a drying oven, and evaporating the solvent for 60 hours at 90 ℃ under the relative humidity of 50% to obtain a solid. Finally, the solid matter is heated for 1 min at the heating rate -1 And roasting at 500 ℃ for 8h to obtain the catalyst for purifying the automobile exhaust.
Evaluation of catalyst Activity: the catalyst activity evaluation is carried out on a fixed bed reactor, and fresh and aged catalyst activity evaluation is carried out in a simulated atmosphere. Evaluation atmosphere conditions: NO (300 ppm), CO2 (15%), H2O (10%), C3H6 (300 ppm), C3H8 (150 ppm), CO (1.2%) and N as carrier gas 2 The heating rate is 10 ℃/min, and the airspeed is 40000h -1 . In the following table, the fresh catalyst refers to the catalyst for purifying automobile exhaust gas prepared in this example. The aged catalyst refers to a fresh catalyst after being aged. Aging at 1000 deg.C for 10h,10% 2 And O, performing hydrothermal aging. Light-off temperature T50 of catalyst: the temperature corresponding to the exhaust gas conversion rate of 50% is used as an index for evaluating the light-off activity of the catalyst, and the smaller the T50 value is, the better the catalytic activity is. HC-T50 (. Degree. C.), CO-T50 (. Degree. C.), NO-T50 (. Degree. C.) refer to temperatures at which the conversion of CO, HC, and NO as exhaust gas reaches 50%, respectively. The results were as follows:
| catalyst and process for preparing same | HC-T50(℃) | CO-T50(℃) | NO-T50(℃) |
| Fresh catalyst | 260 | 205 | 274 |
| Aged catalyst | 334 | 279 | 367 |
Example 3
The embodiment provides a preparation method of a catalyst for purifying automobile exhaust, which comprises the following steps:
first, 3g of P123 template was dissolved in 200mL of a mixed solution of anhydrous ethanol and water at a volume ratio of ethanol to water of 8. Thereafter, ce (NO) is added 3 ) 3 ·6H 2 O、Zr(NO 3 ) 4 ·5H 2 O、Al(NO 3 ) 3 ·9H 2 O、Pd(NO 3 ) 2 And Ca (NO) 3 ) 2 ·4H 2 And adding the template agent solution into the O, stirring for 3h, transferring the formed mixed solution into a drying oven, and evaporating the solvent for 48h at the temperature of 60 ℃ and the relative humidity of 30% to obtain a solid. Finally, the solid matter is heated for 2 min at the heating rate -1 And roasting at 600 ℃ for 4h to obtain the catalyst for purifying the automobile exhaust.
Evaluation of catalyst Activity: the catalyst activity evaluation is carried out on a fixed bed reactor, and fresh and aged catalyst activity evaluation is carried out in a simulated atmosphere. Evaluation atmosphere conditions: NO (300 ppm), CO 2 (15％)、H 2 O(10％)、C 3 H 6 (300ppm)、C 3 H 8 (150 ppm), CO (1.2%) and N as carrier gas 2 The heating rate is 10 ℃/min, and the airspeed is 40000h -1 . In the following table, the fresh catalyst refers to the catalyst for purifying automobile exhaust gas prepared in this example. The aged catalyst refers to a fresh catalyst after being aged. Aging at 1000 deg.C, 10h,10% 2 And O, performing hydrothermal aging. Light-off temperature T50 of catalyst: the temperature corresponding to the exhaust gas conversion rate of 50% is used as an index for evaluating the light-off activity of the catalyst, and the smaller the T50 value is, the better the catalytic activity is. HC-T50 (. Degree. C.), CO-T50 (. Degree. C.), NO-T50 (. Degree. C.) refer to temperatures at which the conversion of CO, HC, and NO as exhaust gas reaches 50%, respectively. The results are as follows:
| catalyst and process for producing the same | HC-T50(℃) | CO-T50(℃) | NO-T50(℃) |
| Fresh catalyst | 242 | 193 | 250 |
| Aged catalyst | 323 | 263 | 336 |
Comparative example
This comparative example differs from example 1 only in that:
the templating agent selected for this comparative example was polyvinyl alcohol (PVA).
Evaluation of catalyst Activity: the catalyst activity evaluation was carried out on a fixed bed reactor, and fresh and aged catalyst activity evaluation was carried out in a simulated atmosphere. Evaluation atmosphere conditions: NO (300 ppm), CO 2 (15％)、H 2 O(10％)、C 3 H 6 (300ppm)、C 3 H 8 (150 ppm), CO (1.2%) and N as carrier gas 2 The heating rate is 10 ℃/min, and the airspeed is 40000h -1 . In the following table, fresh catalyst refers to the catalyst for purification of automobile exhaust gas prepared by the present comparative example. The aged catalyst refers to a fresh catalyst after being aged. The aging treatment condition was 1000 deg.C，10h，10％H 2 And O, performing hydrothermal aging. Light-off temperature T50 of catalyst: the temperature corresponding to the exhaust gas conversion rate of 50% is used as an index for evaluating the light-off activity of the catalyst, and the smaller the T50 value is, the better the catalytic activity is. HC-T50 (. Degree. C.), CO-T50 (. Degree. C.), and NO-T50 (. Degree. C.) refer to temperatures at which the conversion rates of CO, HC, and NO as exhaust gas reach 50%, respectively. The results are as follows:
| catalyst and process for preparing same | HC-T50(℃) | CO-T50(℃) | NO-T50(℃) |
| Fresh catalyst | 300 | 235 | 315 |
| Aged catalyst | 360 | 296 | 390 |
Various embodiments of the present application may exist in a range of forms; it should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the application; accordingly, the described range descriptions should be considered to have specifically disclosed all the possible sub-ranges as well as individual numerical values within that range. For example, it is contemplated that the description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the stated range, such as 1, 2, 3, 4, 5, and 6, as applicable regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any number (fractional or integer) recited within the range so indicated.
In the present application, unless otherwise specified, the use of directional words such as "upper" and "lower" specifically refer to the orientation of the figures in the drawings. In addition, in the description of the present specification, the terms "include", "includes" and the like mean "including but not limited to". Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element. In this document, relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a alone, A and B together, and B alone. For the association relationship of more than three associated objects described by "and/or", it means that any one of the three associated objects may exist alone, or any at least two of them may exist simultaneously, for example, for a, and/or B, and/or C, it may mean that any one of a, B, and C exists alone, or any two of them exist simultaneously, or three of them exist simultaneously. As used herein, "at least one" means one or more, "a plurality" means two or more. "at least one," "at least one of the following," or similar expressions, refer to any combination of these items, including any combination of the singular or plural items. For example, "at least one (one) of a, b, or c," or "at least one (one) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, and c may be single or plural, respectively.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A preparation method of a catalyst for purifying automobile exhaust is characterized by comprising the following steps:
dissolving a P123 template in a solvent to obtain a template solution;
adding Ce (NO) 3 ) 3 、Zr(NO 3 ) 4 、Al(NO 3 ) 3 、Pd(NO 3 ) 2 、(NH 3 ) 4 Pt(NO 3 ) 2 、Rh(NO 3 ) 3 Adding at least one of nitrate of modified elements and the template solution to obtain a mixed solution;
evaporating the solvent of the mixed solution to obtain a solid substance;
and roasting the solid matter to obtain the catalyst for purifying the automobile exhaust.
2. The method of manufacturing a catalyst for purifying automobile exhaust according to claim 1, wherein the solvent is ethanol or a mixed solution of ethanol and water.
3. The method of manufacturing an automobile exhaust gas-purifying catalyst according to claim 2, wherein the solvent is a mixed solution of ethanol and water at a volume ratio of 4.
4. The method of preparing a catalyst for purifying automobile exhaust gas according to claim 3, wherein the P123 template is dissolved in the solvent, and the amount of the P123 template dissolved in the solvent is 60 to 80mL per 1 g.
5. The method for producing an automobile exhaust gas-purifying catalyst according to claim 1, wherein the modifying element is at least one of magnesium and calcium.
6. The method of preparing a catalyst for purifying automobile exhaust according to claim 1, wherein 150 to 200g of the P123 template is present per 1mol of the metal atom in the mixed solution.
7. The method of manufacturing a catalyst for purifying automobile exhaust according to claim 1, wherein the evaporation of the solvent of the mixed solution is performed in an environment having a temperature of 50 to 80 ℃ and a relative humidity of 20 to 50%.
8. The method for preparing a catalyst for purification of automobile exhaust according to claim 1, wherein the calcination temperature is 500 to 800 ℃.
9. The method of preparing the catalyst for purifying automobile exhaust according to claim 1, wherein the calcination is continued for 12 to 60 hours.
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