CN115155603A - Bimetallic element co-doped lanthanum-based perovskite oxide catalyst and preparation method and application thereof - Google Patents
Bimetallic element co-doped lanthanum-based perovskite oxide catalyst and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a bimetallic element co-doped lanthanum-based perovskite oxide catalyst and a preparation method and application thereof. Firstly, the material is a lanthanum-based perovskite oxide catalyst material codoped by an alkali metal or alkaline earth metal element and a cerium element at the A site, wherein the perovskite material is any one of lanthanum iron, lanthanum cobalt, lanthanum manganese and lanthanum nickel perovskite; secondly, the preparation method mainly uses nitrate and glucose of corresponding metal elements as complexing agents to complex A-site ions and B-site ions in the perovskite so as to obtain the lanthanum-based perovskite oxide material. The lanthanum-based perovskite oxide catalyst material codoped by the alkali metal or alkaline earth metal element and the cerium element at the A site has the advantages of simple preparation process, strong practicability and easy realization of large-scale production.
Description
Technical Field
The invention relates to the technical field of catalyst material preparation, in particular to a bimetallic element co-doped lanthanum-based perovskite oxide catalyst and a preparation method and application thereof.
Background
With the rapid development of social economy and the continuous increase of industrial scale, the energy consumption mainly based on petroleum fuels greatly rises, so that the problem of regional composite air pollution characterized by PM2.5, acid rain and ozone is very prominent, and researches show that carbon smoke particles in the tail gas pollutants of the diesel engine are one of the main sources of urban air pollution. Over the past few decades, a variety of technologies, including clean oil technologies, engine fuel optimized combustion, and exhaust after-treatment technologies, have been extensively studied and used for the abatement of soot particles. The catalytic purification treatment of the pollutants in the tail gas of the diesel vehicle before the pollutants are discharged into the atmospheric environment is one of the most effective means for solving the serious environmental pollution problem of the carbon smoke particles in the tail gas of the diesel vehicle. At present, the key to the development of this technology is the development of high performance catalysts.
In recent years, perovskite oxide catalysts have been widely used for the research of catalytic combustion of soot particles in diesel exhaust because of their advantages such as low cost, high thermal stability and mechanical strength, and good oxidation-reduction properties. The perovskite catalyst is natural CaTiO 3 Oxides with the same structure and the general formula of the structure is ABO 3 . In the early 70 s of the 20 th century, libby, voorhoeve and the like preliminarily researched the catalysis of cobalt or manganese-containing perovskite catalysts on the aspect of tail gas of gasoline engines, and the perovskite-type structure catalysts are found to have higher activity(Libby W F.Sicence,1971,171, 499, voorhoeve R J H, remeika J P, freeland P E.Sicence,1972,177, 353). Research has shown that perovskite catalysts are a very potential replacement for noble metal catalysts, with advantages not found in conventional catalysts: (1) the constituent elements and chemical components are diverse; (2) The volume of the particles is stable and the specific surface area is easy to evaluate; (3) The stoichiometry, vacancy variation range is large, and the potential for changes in catalytic performance is large (Zhu J J, li H L, zhong L Y, et al, ACS Catalysis,2014,4, 2917). At present, perovskite type oxide catalyst materials mainly comprise the following preparation methods, such as a coprecipitation method, a sol-gel method, a hydrothermal method, a microemulsion method and the like, but the perovskite catalyst prepared by the method has certain limitations in the aspects of the morphology, the pore size and the like of the catalyst.
The soot catalytic combustion is a gas-solid three-phase deep oxidation reaction, improves the contact between the catalyst and soot particles, improves the intrinsic activity of the catalyst, and can effectively improve the catalytic performance of the catalyst. On one hand, in order to improve the contact efficiency, the perovskite catalyst with the 3DOM structure is successfully synthesized by a colloidal crystal template method and applied to the catalytic combustion of the soot. Meanwhile, in order to improve the active oxygen capacity at low temperature, 3 DOM-La-based perovskite supported noble metal catalysts which have excellent catalytic performance on soot combustion are also designed and prepared. To further increase the contact efficiency of soot particles with the active sites of the catalyst, a variety of perovskite oxide catalysts having specific morphologies, such as porous nanotube perovskites, nanofibers and other morphologies, have been designed and synthesized and applied to soot combustion reactions (Fang F, zhao P, feng N J, et al, catalysis Science&Technology,2019,9,4938; lee C, jeon Y, hata S, et al, applied Catalysis B, environmental,2016; 191; mac-Sotelo C, cruz-L Lopez A, suz-V z quez SI, materials Chemistry and Physics,2019;228,194). On the other hand, in order to improve the intrinsic activity of the perovskite catalyst, researchers select other metal ions to replace ABO 3 The ions A and B in the perovskite catalyst are an important research heat for soot combustion by regulating and controlling the substitution elements of the sites A and B from the aspect of mechanism so as to change the physicochemical characteristics of the perovskite catalystAnd (4) point. For example, laCoO 3 (La 1-x Ag x CoO 3 ) Substituting the A position with the Ag ion in the (1); laCoO 3 (La 1 -xK x Co 1 -yPdyO 3-δ ) The neutral K and Pd ions simultaneously replace the A site and the B site; laCoO 3 (La 1-x Sr x CoO 3 ) The Sr ion in (1) replaces the A site of Co-based perovskite (He L J, zhang Y, zang Y C, et al, ACS catalysis.2021,11,14224; guo X, meng M, dai F F, et al, applied Catalysis B, environmental,2013,142-143,278; onrubia-Calvo JA, pereda-Ayo B, de-La-Torre U, et al, applied Catalysis B: environmental,2017,213, 198). However, there are few prior art solutions to the problem of introducing LaCoO 3 La at position A 3+ It is described that an alkali metal or alkaline earth metal element having a strong electron donating ability and a cerium element having a high oxygen storage ability are partially co-substituted to obtain a soot oxidation catalyst.
Disclosure of Invention
In view of the above, the invention discloses a bimetallic element co-doped lanthanum-based perovskite oxide catalyst, and a preparation method and application thereof.
The invention provides a technical scheme, in particular to a bimetallic element co-doped lanthanum-based perovskite oxide catalyst, and a lanthanum-based perovskite catalyst structural formula ABO 3 In the A position, the double metals are codoped by alkali metal or alkaline earth metal elements and cerium elements.
Further, the lanthanum-based perovskite catalyst is any one or more of lanthanum iron, lanthanum cobalt, lanthanum manganese and lanthanum nickel perovskite.
The preparation method of the catalyst adopts a sol-gel method which takes nitrate and glucose of corresponding metal elements as complexing agents.
Further, mixing three raw materials of a precursor material nitrate of the lanthanum-based perovskite, complexing agent glucose and water in a beaker, and stirring the mixture on a stirrer, wherein the stirring time is 1-4h, the dosage of the precursor nitrate is 0.2-10g, and the dosage of the water is 10-50mL; the dosage of the glucose is 0.5-10g; putting the stirred solution into an oven to be dried for 12-24h, wherein the temperature of the oven is 60-80 ℃, transferring the dried sample into the oven with the temperature of 80-100 ℃ to be dried for 12-24h; and calcining the dried sample in a muffle furnace at 650-1000 ℃ for 2-10h to obtain the lanthanum-based perovskite co-doped with the alkali metal or alkaline earth metal element and the cerium element at the A site.
Further, the temperature is programmed to be increased to 650-1000 ℃ at the temperature rising rate of 2-10 ℃/min.
Further, the catalyst is applied to catalytic combustion reaction of soot particles.
The invention has the beneficial effects that:
firstly, the invention provides a lanthanum-based perovskite catalyst co-doped with a bimetallic element, the lanthanum-based perovskite catalyst is a lanthanum-based perovskite structure material co-doped with an alkali metal or alkaline earth metal element and a cerium element at an A site, and the lanthanum-based perovskite catalyst has higher catalytic activity and stability when used for catalyzing the combustion of soot particles;
secondly, the invention provides a novel and simple method for preparing the bimetallic element A-site co-doped lanthanum-based perovskite catalyst, glucose is used as a complexing agent in the method, and the method has the advantages of simple preparation process, easily obtained raw materials, low cost, strong practicability and easiness in realizing large-scale production.
Finally, the obtained metal element co-doped lanthanum-based perovskite catalyst is used in the catalytic combustion reaction of soot particles, and the catalyst has high catalytic activity, wherein the soot particles can be completely removed at the temperature of below 400 ℃.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or prior art solutions of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a diagram showing a lanthanum-cobalt-based perovskite LaCoO provided in comparative example 1 of the disclosure of the invention 3 A catalyst XRD diffractogram;
FIG. 2 shows a lanthanum-cobalt-based perovskite La provided in comparative example 2 of the disclosure of the invention 0.9 K 0.1 CoO 3 And La 0.9 Ce 0.1 CoO 3 A catalyst XRD diffractogram;
FIG. 3 is an XRD diffraction pattern of a lanthanum-cobalt-base perovskite catalyst co-doped with an alkali metal element and a cerium element provided in example 1 of the disclosure;
FIG. 4 is an XRD diffraction pattern of a lanthanum cobalt base perovskite catalyst co-doped with an alkaline earth metal element and a cerium element provided in example 2 of the disclosure;
FIG. 5 shows a lanthanum-cobalt-based perovskite LaCoO provided in comparative example 1 of the disclosure of the present invention 3 SEM photograph of the catalyst;
fig. 6 is an SEM photograph of the lanthanum cobalt based perovskite catalyst co-doped with the alkali metal element K and the cerium element provided in example 1 of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of systems consistent with certain aspects of the invention, as detailed in the appended claims.
The embodiment provides a bimetallic element co-doped lanthanum-based perovskite oxide catalyst, and the lanthanum-based perovskite catalyst has a structural formula of LaBO 3 In the A position, the alkali metal or alkaline earth metal element and cerium element are codoped, and the bimetal is the alkali metal or alkaline earth metal element and cerium elementIn the embodiment, the alkali metal or alkaline earth metal element with stronger electron donating capability and the cerium element with high oxygen storage capability are selected for partial co-substitution;
the lanthanum-based perovskite catalyst can be any one or more of lanthanum iron, lanthanum cobalt, lanthanum manganese and lanthanum nickel perovskite.
The method for preparing the catalyst adopts a sol-gel method which takes nitrate and glucose of corresponding metal elements as complexing agents, namely, cheap glucose is taken as the complexing agent to prepare the lanthanum-based perovskite material;
the method comprises the following specific steps:
mixing three raw materials, namely a precursor material nitrate of lanthanum-based perovskite, complexing agent glucose and water in a beaker, and stirring the mixture on a stirrer, wherein the stirring time is 1-4h, the dosage of the precursor nitrate is 0.2-10g, and the dosage of the water is 10-50mL; the dosage of glucose is 0.5-10g; putting the stirred solution into an oven to be dried for 12-24h, wherein the temperature of the oven is 60-80 ℃, transferring the dried sample into the oven with the temperature of 80-100 ℃ to be dried for 12-24h; and calcining the dried sample in a muffle furnace at 650-1000 ℃ for 2-10h to obtain the lanthanum-based perovskite co-doped with the alkali metal or alkaline earth metal element and the cerium element at the A site.
Preferably, the temperature is programmed to 650-1000 ℃ at a temperature rate of 2-10 ℃/min.
The prepared bimetallic element co-doped lanthanum-based perovskite catalyst is used for catalytic combustion reaction of soot particles, and the catalyst has high catalytic activity, wherein the soot particles can be completely removed at the temperature of below 400 ℃.
Example 1
Preparation of lanthanum-cobalt-based perovskite catalyst codoped with alkali metal element and cerium element
According to La 0.9 Ce 0.05 Li 0.05 CoO 3 、La 0.9 Ce 0.05 Na 0.05 CoO 3 、La 0.9 Ce 0.05 K 0.05 CoO 3 、La 0.9 Ce 0.05 Rb 0.05 CoO 3 、La 0.9 Ce 0.05 Cs 0.05 CoO 3 Weighing 3.89g of La (NO) precursor material for preparing perovskite according to the proportion relation 3 ) 3 ·6H 2 O、0.22g Ce(NO 3 ) 3 ·6H 2 O、2.91g Co(NO 3 ) 2 ·6H 2 O、0.01-10g MNO 3 (M = Li, na, K, rb, cs), placed in a beaker, followed by the addition of 3.96g of complexing agent glucose, 30mL of water, then placed on a stirrer and stirred for 4h. And putting the stirred solution into a 90 ℃ drying oven to be dried for 24h, putting the dried sample into a muffle furnace to be calcined for 6h at 750 ℃ to obtain the alkali metal element and cerium element co-doped lanthanum-cobalt-base perovskite catalyst.
FIG. 3 is an XRD (X-ray diffraction) diagram of a lanthanum-cobalt-based perovskite catalyst co-doped with an alkali metal element and a cerium element, and it can be seen from the XRD diagram that the prepared catalysts are perovskite-structured catalysts.
FIG. 6 is La 0.9 Ce 0.05 K 0.05 CoO 3 SEM photograph of the catalyst. And LaCoO 3 Compared with the prior art, the morphology of the catalyst is simultaneously influenced by K and Ce cations, the partial doping of K makes the edge of a hole fuzzy, the catalyst is mainly expressed as a nanocluster structure, and rich mesopore and macropore structures are formed in the catalyst, because the doping of K changes the aggregation degree between particles, the contact efficiency of soot particles and catalyst active sites is further increased, and simultaneously, the rich mesopore structures are beneficial to the activation of gas micromolecules, so that the La is improved 0.9 Ce 0.05 K 0.05 CoO 3 The catalytic activity of (3).
Table 1 shows the activity of the alkali metal element and cerium element co-doped lanthanum-cobalt-based perovskite catalyst for catalytic combustion of soot particles tested in example 1, and the alkali metal element and cerium element co-doped lanthanum-cobalt-based perovskite catalyst shows good activity for catalytic combustion of soot particles.
TABLE 1 Activity of alkali metal element and cerium co-doped lanthanum cobalt base perovskite catalyst for catalytic combustion of soot particles
Example 2
Preparation of lanthanum-cobalt-based perovskite catalyst codoped with alkaline earth metal element and cerium element
According to La 0.9 Ce 0.05 Mg 0.05 CoO 3 、La 0.9 Ce 0.05 Ca 0.05 CoO 3 、La 0.9 Ce 0.05 Sr 0.05 CoO 3 、La 0.9 Ce 0.05 Ba 0.05 CoO 3 Weighing 3.89g La (NO) of precursor material for preparing perovskite 3 ) 3 ·6H 2 O、0.22g Ce(NO 3 ) 3 ·6H 2 O、2.91g Co(NO 3 ) 2 ·6H 2 O、0.01-10g MNO 3 (M = Mg, ca, sr, ba), placed in a beaker, followed by the addition of 3.96g of complexing agent glucose, 30mL of water, then placed on a stirrer for 4h. And putting the stirred solution into a 90 ℃ drying oven for drying for 24h, putting the dried sample into a muffle furnace for calcining at 750 ℃ for 6h to obtain the lanthanum-cobalt-base perovskite catalyst codoped by the alkaline earth metal element and the cerium element.
Fig. 4 is an XRD chart of the lanthanum-cobalt-based perovskite catalyst co-doped with alkaline earth metal elements and cerium elements, and it can be seen from the XRD chart that all the catalysts prepared are perovskite-structured catalysts. Table 2 shows the activity of the alkaline earth metal element and cerium element Co-doped lanthanum cobalt perovskite catalyst for catalyzing the combustion of soot particles tested in example 2, and compared with the catalyst tested in example 1, the alkaline earth metal element and cerium element Co-doped lanthanum cobalt perovskite catalyst shows a certain reduction in the catalytic performance of the soot particle combustion, mainly because the alkali metal has a stronger electron donating ability compared with the alkaline earth metal, which is more beneficial to Co cobalt perovskite catalyst on the surface of the catalyst 2+ And oxygen vacancy is generated, so that the adsorption and activation capacity of gaseous oxygen is further improved, and therefore, the lanthanum-cobalt-based perovskite catalyst codoped by the alkali metal element and the cerium element shows better catalytic activity in the combustion process of soot particles.
TABLE 2 Activity of alkaline-earth metal element and cerium co-doped lanthanum-cobalt-base perovskite catalyst for catalytic combustion of soot particles
Comparative example 1
Preparation of LaCoO 3 Catalyst and process for preparing same
According to LaCoO 3 Weighing 4.33g La (NO) of precursor material for preparing perovskite 3 ) 3 ·6H 2 O and 2.91g Co (NO) 3 ) 2 ·6H 2 And O, placing the mixture in a beaker, adding 3.96g of complexing agent glucose and 30mL of water, and then placing the mixture on a stirrer to stir for 4 hours. Putting the stirred solution into a 90 ℃ oven for drying for 24h, putting the dried sample into a muffle furnace for calcining at 750 ℃ for 6h to obtain LaCoO 3 A perovskite catalyst. FIG. 1 shows LaCoO 3 XRD pattern of perovskite catalyst, from which it can be seen that the catalyst prepared is a perovskite structure catalyst. FIG. 5 shows LaCoO 3 SEM photograph of the catalyst, from which LaCoO was observed 3 The catalyst has rich mesopores and macropores, and the mesopores and macropores are formed by LaCoO 3 The accumulation of nanoparticles forms, the pore structure of which is mainly formed by the decomposition of glucose into CO during the calcination process 2 So that the effect is achieved. Table 3 shows LaCoO measured in comparative example 1 3 The activity of the perovskite catalyst to catalyze the combustion of soot particles, as can be observed in conjunction with Table 1 in example 1, laCoO 3 The catalytic activity of the perovskite catalyst is obviously lower than that of La 0.9 Ce 0.05 K 0.05 CoO 3 The catalyst further shows that the Co-doping of the alkali metal K and the cerium element A site obviously improves the activity of the La-Co based perovskite catalyst.
TABLE 3 LaCoO 3 Activity of catalyst for catalytic Combustion of soot particles
Comparative example 2
Preparation of doped La 0.9 K 0.1 CoO 3 And La 0.9 Ce 0.1 CoO 3 Catalyst and process for preparing same
According to La 0.9 K 0.1 CoO 3 And La 0.9 Ce 0.1 CoO 3 Weighing 3.89g of La (NO) precursor material for preparing perovskite according to the proportion relation 3 ) 3 ·6H 2 O、2.91g Co(NO 3 ) 2 ·6H 2 O、0.43g Ce(NO 3 ) 3 ·6H 2 O or 0.10g KNO 3 Placed in a beaker, then 3.96g of complexing agent glucose and 30mL of water are added, and then placed on a stirrer to be stirred for 4h. Putting the stirred solution into a 90 ℃ oven for drying for 24h, putting the dried sample into a muffle furnace for calcining at 750 ℃ for 6h to obtain La 0.9 K 0.1 CoO 3 And La 0.9 Ce 0.1 CoO 3 A perovskite catalyst. FIG. 2 is La 0.9 K 0.1 CoO 3 And La 0.9 Ce 0.1 CoO 3 XRD pattern of perovskite catalyst, from which La can be seen 0.9 K 0.1 CoO 3 The catalyst is a perovskite structure catalyst, and La 0.9 Ce 0.1 CoO 3 The catalyst showed a weak diffraction peak at 28.5 deg. corresponding to CeO 2 The (111) crystal plane of (a). Table 4 shows La measured in comparative example 2 0.9 K 0.1 CoO 3 And La 0.9 Ce 0.1 CoO 3 The activity of the perovskite catalyst for catalyzing the combustion of the soot particles shows that La 0.9 K 0.1 CoO 3 And La 0.9 Ce 0.05 K 0.05 CoO 3 T of catalyst 10 、T 50 And T 90 Similar values and significantly lower than LaCoO 3 And La 0.9 Ce 0.1 CoO 3 A catalyst. Therefore, la 0.9 K 0.1 CoO 3 And La 0.9 Ce 0.05 K 0.05 CoO 3 The activity of the catalyst on the catalytic combustion of the soot particles is obviously higher than that of LaCoO 3 And La 0.9 Ce 0.1 CoO 3 A catalyst.
TABLE 4 La 09 K 01 CoO 3 And La 09 Ce 01 CoO 3 Activity of catalyst for catalytic Combustion of soot particles
Comparative example 3
La 0.9 Ce 0.05 K 0.05 CoO 3 And La 0.9 K 0.1 CoO 3 Stability testing of the catalyst
Due to La 0.9 Ce 0.05 K 0.05 CoO 3 And La 0.9 K 0.1 CoO 3 The catalytic performance of the catalysts was similar, and therefore, the stability test was performed on the above catalysts in five repetitions under the same conditions, and the test results are shown in table 5. The study shows that La 0.9 Ce 0.05 K 0.05 CoO 3 Catalyst compared to La 0.9 K 0.1 CoO 3 The catalyst has higher stability, which proves the promotion effect of Ce on the stability of the catalyst, and further embodies the bifunctional effect of the La-Co based perovskite catalyst of K and Ce ions for replacing La ions in the catalytic combustion of soot.
TABLE 5 La 09 Ce 005 K 005 CoO 3 And La 09 K 01 CoO 3 Stability of catalyst-catalyzed combustion soot particles
Method for evaluating catalyst activity in this example: by using a gas chromatography detection system, a catalyst adopts a fixed bed mode
The method comprises the following specific steps: placing weighed perovskite catalyst and carbon smoke particles on weighing paper, uniformly stirring by using a medicine spoon to ensure that the catalyst is loosely contacted with the carbon smoke particles, and filling the mixture into a quartz reaction tube with the thickness of 6mm, wherein the gas flow is controlled to be 50mL/min, the volume content of NO in gas is 2000ppm 2 The volume content of (A) is 10%, and the balance is Ar; the heating rate is controlled to be about 2 ℃/min.
Evaluation method: strong and weak oxidation capacity of catalystExpressed in terms of the combustion temperature of the soot particles, wherein the ignition temperature (T) of the soot particles 10 ) Temperature (T) corresponding to the maximum burning rate 50 ) And burnout temperature (T) 90 ) Respectively representing the temperature points corresponding to 10%, 50% and 90% of the soot combustion, by calculating the CO generated by soot combustion in the temperature programmed oxidation reaction 2 Integration of the curve with CO, CO 2 The temperature points corresponding to the numerical values of 10%, 50% and 90% of the sum of the integrated areas of CO are T 10 、T 50 And T 90 . Wherein S CO2 m Indicates the CO corresponding to the catalyst at the time when the soot is burned at the maximum rate 2 And (4) selectivity. The catalytic combustion results of the pure soot particles are shown in table 6, and it can be seen from the table that the combustion temperature of the pure soot is higher in the absence of the catalyst, which indicates that the bimetallic element a-site co-doped lanthanum-based perovskite oxide catalyst prepared by the invention has higher catalytic activity for catalytic combustion of the soot particles.
TABLE 6 catalytic Combustion Activity of pure soot particles
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (6)
1. A bimetallic element co-doped lanthanum-based perovskite oxide catalyst is characterized in that the lanthanum-based perovskite catalyst has a structural formula ABO 3 In the A position, the alkali metal or alkaline earth metal element and the cerium element are co-doped, and the bimetal is alkali metal orAlkaline earth metal elements and cerium elements.
2. The bimetallic element co-doped lanthanum-based perovskite oxide catalyst as claimed in claim 1, wherein the lanthanum-based perovskite catalyst is any one or more of lanthanum iron, lanthanum cobalt, lanthanum manganese and lanthanum nickel perovskite.
3. The method for preparing the catalyst according to claims 1-2, wherein a sol-gel method using nitrates of the corresponding metal elements and glucose as complexing agents is employed.
4. The method for preparing a catalyst according to claim 3,
mixing three raw materials, namely a precursor material nitrate of lanthanum-based perovskite, complexing agent glucose and water in a beaker, and stirring the mixture on a stirrer, wherein the stirring time is 1-4h, the dosage of the precursor nitrate is 0.2-10g, and the dosage of the water is 10-50mL; the dosage of glucose is 0.5-10g; placing the stirred solution into an oven to be dried for 12-24h, wherein the temperature of the oven is 60-80 ℃, transferring the dried sample into an oven with the temperature of 80-100 ℃ to be dried for 12-24h; and placing the dried sample in a muffle furnace to calcine for 2-10h at 650-1000 ℃ to obtain the lanthanum-based perovskite co-doped with the alkali metal or alkaline earth metal element and the cerium element at the A site.
5. The method of claim 4, wherein the temperature is programmed to 650-1000 ℃ at a temperature ramp rate of 2-10 ℃/min.
6. Use of a catalyst according to claims 1-2, characterized in that the catalyst is used in a catalytic combustion reaction of soot particles.
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