Preparation method and application of phosphorus-modified perovskite oxide-supported noble metal catalyst

Abstract

The present invention discloses a preparation method and application of a phosphorus-modified perovskite oxide-loaded noble metal catalyst, and belongs to the technical field of organic waste gas treatment. The present invention provides noble metal-specific anchoring sites through phosphorus-modified perovskite oxides, promotes the dispersion of noble metal nanoparticles, and stabilizes the noble metal nanoparticles. In addition, the electron-rich characteristics of the outer layer of phosphorus are utilized to reduce the electron density of the noble metal, thereby enhancing its ability to activate molecular oxygen at low temperatures. Ultimately, the catalytic activity and stability of the loaded noble metal catalyst are significantly improved, and the method is suitable for phosphorus-modified different perovskite oxides to load different noble metal catalysts. The processing method is simple, and the catalytic combustion performance of the catalyst for VOCs (especially toluene) is significantly improved, and the performance is stable. Moreover, during the entire reaction process of the present invention, no toxic or harmful substances are used or produced, which fully meets the requirements of clean production.

Description

Technical Field

[0001] The invention belongs to the technical field of organic waste gas treatment, and specifically relates to a preparation method and application of a phosphorus-modified perovskite oxide-loaded noble metal catalyst. Background Art

[0002] VOCs are O3 and PM 2.5 , which has caused serious harm to the ecological environment and human health. For the control of VOCs, catalytic combustion is an economical and effective means. Catalysts play a vital role in the catalytic oxidation process. Among them, precious metal-based catalysts, especially platinum-based catalysts, have good catalytic activity. However, precious metal-based catalysts are easily sintered and deactivated at high temperatures. Therefore, further improving the low-temperature activity and high-temperature sintering resistance of precious metal-based catalysts is a prerequisite for the widespread industrial application of precious metal-based catalysts. Summary of the invention

[0003] The purpose of the present invention is to provide a preparation method and application of a phosphorus-modified perovskite oxide-supported noble metal catalyst. The phosphorus-modified perovskite oxide improves the dispersion of the noble metal supported thereon, reduces the valence state, exhibits excellent molecular oxygen activation ability, and thus improves the catalytic oxidation performance.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] One of the technical solutions of the present invention is to provide a method for preparing a phosphorus-modified perovskite oxide-supported noble metal catalyst, comprising the following steps:

[0006] A lanthanum source, a manganese source, citric acid, ethylene glycol and a phosphorus source are mixed in water, heated for reaction, and the product obtained after the reaction is dried to obtain a phosphorus-modified perovskite oxide precursor; the phosphorus-modified perovskite oxide precursor is then calcined to obtain a phosphorus-modified perovskite oxide; finally, a noble metal source is mixed with the phosphorus-modified perovskite oxide and calcined to obtain the phosphorus-modified perovskite oxide-loaded noble metal catalyst.

[0007] Preferably, the usage ratio of the lanthanum source, the manganese source, the citric acid and the ethylene glycol is 0.005 mol: 0.005 mol: 0.02 mol: 1.2 mL.

[0008] Preferably, the molar amount of phosphorus in the phosphorus source is 1.5-10% of the molar amount of manganese in the manganese source; more preferably, 3-5%.

[0009] Preferably, the lanthanum source is a soluble lanthanum salt; more preferably lanthanum nitrate.

[0010] Preferably, the manganese source is a soluble manganese salt; more preferably, it is manganese nitrate.

[0011] Preferably, the phosphorus source is hydroxyethylidene diphosphoric acid or ammonium dihydrogen phosphate; more preferably, it is hydroxyethylidene diphosphoric acid.

[0012] Preferably, the temperature of the heating reaction is 80° C. and the time is 6 hours; the temperature of calcining the phosphorus-modified perovskite oxide precursor is 700° C. and the holding time is 2 hours.

[0013] Preferably, the noble metal source is a platinum source, a palladium source or a ruthenium source; the mass of the noble metal in the noble metal source is 0.1 to 1%, more preferably 0.3 to 0.5%, of the mass of the phosphorus-modified perovskite oxide.

[0014] The platinum source may be platinum nitrate, chloroplatinic acid or platinum acetylacetonate, with platinum nitrate being more preferred.

[0015] Preferably, the calcination temperature after the noble metal source and the phosphorus-modified perovskite oxide are mixed is 300 to 500°C; more preferably 300 to 400°C.

[0016] Preferably, the noble metal source and the phosphorus-modified perovskite oxide are blended by grinding for 10 to 30 minutes; more preferably, the grinding time is 10 to 20 minutes.

[0017] The second technical solution of the present invention is to provide a phosphorus-modified perovskite oxide-loaded precious metal catalyst prepared according to the preparation method of the above-mentioned phosphorus-modified perovskite oxide-loaded precious metal catalyst.

[0018] The third technical solution of the present invention is to provide an application of the above-mentioned phosphorus-modified perovskite oxide loaded with precious metal catalyst in the catalytic combustion of VOCs.

[0019] Preferably, the VOCs include toluene, ethyl acetate or propane.

[0020] The present invention selects phosphorus-modified perovskite oxide as a carrier for supporting precious metal catalysts, and utilizes the fact that the outer electron orbital of the phosphorus element has 5 electrons. When it is bonded to the precious metal, it triggers electronic interaction by hybridization with the unoccupied d(f) orbital of the precious metal atom, changes the outer electron distribution of the precious metal, thereby reducing the valence state of the precious metal, and improving its low-temperature activation ability for molecular oxygen. At the same time, it specifically anchors the precious metal to improve its dispersibility and thermal stability, thereby significantly improving the catalytic performance of the supported precious metal catalyst.

[0021] The beneficial technical effects of the present invention are as follows:

[0022] The present invention provides noble metal-specific anchoring sites through phosphorus-modified perovskite oxides, promotes the dispersion of noble metal nanoparticles, and stabilizes the noble metal nanoparticles. In addition, the electron-rich characteristics of the outer layer of phosphorus are utilized to reduce the electron density of the noble metal, thereby enhancing its ability to activate molecular oxygen at low temperatures. Ultimately, the catalytic activity and stability of the supported noble metal catalyst are significantly improved, and it is suitable for phosphorus-modified different perovskite oxides to load different noble metal catalysts. The processing method is simple, and the catalytic combustion performance of the catalyst for VOCs (especially toluene) is significantly improved, and the performance is stable. Moreover, during the entire reaction process of the present invention, no toxic or harmful substances are used or produced, which fully meets the requirements of clean production.

[0023] The present invention doped perovskite metal oxide with phosphorus and then loaded with platinum catalyst to obtain a composite catalyst with significantly improved catalytic oxidation performance for VOCs. Compared with the untreated catalyst, the catalytic activity of the optimal embodiment was greatly improved, and the T 90 Compared with the untreated catalyst (Comparative Example 1), the temperature is reduced by nearly 120° C. At the same time, the phosphorus-modified perovskite oxide-supported noble metal catalyst prepared according to the preparation method of the present invention has good heat resistance and stable structure.

[0024] The preparation method provided by the invention has simple reaction equipment, short reaction time, convenient reaction operation and is conducive to large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The catalysts prepared in Example 1, Comparative Example 1 and Comparative Example 2 of the present invention and the intermediate product LaMnP of Example 1 0.05 Performance comparison chart of O3 catalytic oxidation of toluene.

[0026] Figure 2 This is a performance comparison chart of the catalysts prepared in Example 1 and Example 2 of the present invention for catalytic oxidation of toluene.

[0027] Figure 3 This is a performance comparison chart of the catalysts prepared in Example 1 and Example 3 of the present invention for catalytic oxidation of toluene.

[0028] Figure 4 This is a performance comparison chart of the catalytic oxidation of toluene by the catalysts prepared in Examples 1, 4 and 5 of the present invention.

[0029] Figure 5 This is a performance comparison chart of the catalysts prepared in Examples 1, 6 and 7 of the present invention for catalytic oxidation of toluene.

[0030] Figure 6 This is a performance comparison chart of the catalytic oxidation of toluene by the catalysts prepared in Examples 1, 8 and 9 of the present invention.

[0031] Figure 7 This is a performance comparison chart of the catalysts prepared in Example 1 of the present invention and Comparative Example 2 for catalytic oxidation of ethyl acetate.

[0032] Figure 8 This is a performance comparison chart of the catalysts prepared in Example 1 of the present invention and Comparative Example 2 for catalytic oxidation of propane.

[0033] Fig. 9 The catalysts prepared in Example 1, Comparative Example 1 and Comparative Example 2 of the present invention and the intermediate product LaMnP of Example 1 0.05 XRD pattern of O3.

[0034] Fig.10 This is a performance comparison chart of the catalytic oxidation of toluene by the catalysts prepared in Example 1 of the present invention and Comparative Example 2 before and after secondary high-temperature calcination. DETAILED DESCRIPTION

[0035] Now, various exemplary embodiments of the present invention are described in detail, and this detailed description should not be considered as a limitation of the present invention, but should be understood as a more detailed description of certain aspects, characteristics and embodiments of the present invention. It should be understood that the terms described in the present invention are only for describing specific embodiments and are not used to limit the present invention.

[0036] In addition, for the numerical range in the present invention, it is understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0037] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the invention pertains. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention.

[0038] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0039] Taking platinum as an example of precious metal, the catalytic oxidation effect of the precious metal catalyst supported by phosphorus-modified perovskite oxide as a carrier of the present invention was verified.

[0040] The VOCs conversion rate described in the embodiments and comparative examples of the present invention is defined as the volume percentage of VOCs entering the reactor that are converted, that is, the difference in volume percentage of VOCs in the inlet and outlet gases relative to the volume percentage of VOCs in the inlet gas, in %.

[0041] In the present invention, T 90 Indicates the temperature at which the VOCs conversion rate is 90%.

[0042] Example 1

[0043] Preparation of phosphorus-modified perovskite oxide supported platinum catalyst (optimal conditions):

[0044] Dissolve 0.005mol lanthanum nitrate and 0.005mol manganese nitrate in 20mL of deionized water, add 0.02mol citric acid and 1.2mL ethylene glycol, and then add 5% hydroxyethylidene diphosphonic acid with a molar amount of manganese nitrate. After stirring evenly, place the beaker in an 80℃ oil bath and heat for 6h. After the sample is completely gelled, dry it at 80℃ overnight to obtain a catalyst precursor. Place the precursor in a muffle furnace, heat it to 700℃ at a heating rate of 2℃ / min, and keep it warm for 2h. Calcinate to obtain a phosphorus-modified perovskite catalyst (denoted as LaMnP 0.05 O3). Platinum nitrate and phosphorus-modified perovskite catalyst (the amount of platinum in platinum nitrate is 0.5% of the mass of phosphorus-modified perovskite catalyst) were put into a mortar and ground for 10 minutes, then transferred to a porcelain boat and calcined at 400°C for 2 hours to obtain the final phosphorus-modified perovskite oxide-supported platinum catalyst (denoted as Pt 0.005 / LaMnP 0.05 O3).

[0045] The prepared Pt 0.005 / LaMnP 0.05 O3 powder was pressed into tablets and ground into 40-60 mesh particles, and then the catalytic combustion performance of toluene was evaluated. The evaluation conditions were: 100 mg of catalyst was loaded into the reactor, and synthetic air with a toluene concentration of 1000 ppm, 20 vol% O2, and 80 vol% N2 was introduced at 100 mL / min. WHSV = 60000 mL·g -1 ·h -1 The toluene catalytic combustion effect of the catalyst is shown in Table 1.

[0046] The catalytic combustion performance of ethyl acetate was evaluated under the following conditions: 100 mg of catalyst was loaded into the reactor, and synthetic air with a concentration of 1000 ppm of ethyl acetate, 20 vol% O2, and 80 vol% N2 was introduced at a rate of 100 mL / min. WHSV = 60000 mL·g -1 ·h -1 The catalytic combustion effect of ethyl acetate of the catalyst is shown in Table 1.

[0047] The propane catalytic combustion performance was evaluated under the following conditions: 100 mg of catalyst was loaded into the reactor, and synthetic air with a propane concentration of 1000 ppm, 20 vol% O2, and 80 vol% N2 was introduced at a rate of 100 mL / min. WHSV = 60000 mL·g -1 ·h -1 The propane catalytic combustion effect of the catalyst is shown in Table 1.

[0048] WHSV stands for mass space velocity, which is the standard volume flow rate of the reaction gas entering the reaction system per hour divided by the mass of the catalyst, in mL·g -1 ·h -1 .

[0049] Example 2 investigates the effects of different phosphorus sources on the catalytic combustion of the catalyst.

[0050] Example 2

[0051] Preparation of phosphorus-modified perovskite oxide supported platinum catalyst:

[0052] The method of Example 1 is referred to, except that the phosphorus source is replaced by sodium dihydrogen phosphate in an equal molar amount of phosphorus from hydroxyethylidene diphosphoric acid, and the prepared phosphorus-modified perovskite oxide-supported platinum catalyst is denoted as Pt 0.005 / LaMnP 0.05 O3-monobasic sodium phosphate.

[0053] Verify the prepared Pt 0.005 / LaMnP 0.05 The catalytic combustion performance of O3-sodium dihydrogen phosphate on toluene, the method is shown in Example 1, and the toluene catalytic combustion effect of the catalyst is shown in Table 1.

[0054] Example 3 investigates the effects of different phosphorus doping amounts on the catalytic combustion of the catalyst.

[0055] Example 3

[0056] Preparation of phosphorus-modified perovskite oxide supported platinum catalyst:

[0057] The method of Example 1 is referred to, except that the amount of hydroxyethylidene diphosphoric acid is adjusted to 8% of the molar amount of manganese nitrate. The prepared phosphorus-modified perovskite oxide-supported platinum catalyst is denoted as Pt 0.005 / LaMnP 0.08 O3.

[0058] Verify the prepared Pt 0.005 / LaMnP 0.08 The catalytic combustion performance of O3 on toluene, the method is shown in Example 1, and the catalytic combustion effect of toluene on the catalyst is shown in Table 1.

[0059] Examples 4-5 investigate the effects of different platinum sources on the catalytic combustion of the catalyst.

[0060] Example 4

[0061] Preparation of phosphorus-modified perovskite oxide supported platinum catalyst:

[0062] The method of Example 1 is referred to, except that the platinum source is replaced by chloroplatinic acid with the same mass of platinum instead of platinum nitrate. The prepared phosphorus-modified perovskite oxide-supported platinum catalyst is denoted as Pt 0.005 / LaMnP 0.05 O3-Chloroplatinic acid.

[0063] Verify the prepared Pt 0.005 / LaMnP 0.05 The catalytic combustion performance of O3-chloroplatinic acid on toluene, the method is shown in Example 1, and the toluene catalytic combustion effect of the catalyst is shown in Table 1.

[0064] Example 5

[0065] Preparation of phosphorus-modified perovskite oxide supported platinum catalyst:

[0066] The method of Example 1 is referred to, except that the platinum source is replaced by platinum acetylacetonate of the same mass of platinum instead of platinum nitrate, and the prepared phosphorus-modified perovskite oxide-supported platinum catalyst is denoted as Pt 0.005 / LaMnP 0.05 O3-platinum acetylacetonate.

[0067] Verify the prepared Pt 0.005 / LaMnP 0.05 The catalytic combustion performance of O3-acetylacetonate platinum on toluene, the method is shown in Example 1, and the toluene catalytic combustion effect of the catalyst is shown in Table 1.

[0068] Examples 6-7 investigate the effect of platinum loading on the catalytic combustion of the catalyst.

[0069] Example 6

[0070] Preparation of phosphorus-modified perovskite oxide supported platinum catalyst:

[0071] The method of Example 1 is referred to, except that the platinum content in platinum nitrate is adjusted to 0.2% of the mass of the phosphorus-modified perovskite catalyst. The prepared phosphorus-modified perovskite oxide-supported platinum catalyst is denoted as Pt 0.002 / LaMnP 0.05 O3.

[0072] Verify the prepared Pt 0.002 / LaMnP 0.05 The catalytic combustion performance of O3 on toluene, the method is shown in Example 1, and the catalytic combustion effect of toluene on the catalyst is shown in Table 1.

[0073] Example 7

[0074] Preparation of phosphorus-modified perovskite oxide supported platinum catalyst:

[0075] The method of Example 1 is referred to, except that the platinum content in platinum nitrate is adjusted to 0.8% of the mass of the phosphorus-modified perovskite catalyst. The prepared phosphorus-modified perovskite oxide-supported platinum catalyst is denoted as Pt 0.008 / LaMnP 0.05 O3.

[0076] Verify the prepared Pt 0.008 / LaMnP 0.05 The catalytic combustion performance of O3 on toluene, the method is shown in Example 1, and the catalytic combustion effect of toluene on the catalyst is shown in Table 1.

[0077] Examples 8-9 investigate the effect of different calcination temperatures of a ground mixture of platinum nitrate and phosphorus-modified perovskite catalyst on the catalytic combustion of the catalyst.

[0078] Example 8

[0079] Preparation of phosphorus-modified perovskite oxide supported platinum catalyst:

[0080] The method of Example 1 is referred to, except that the calcination temperature of the mixture of the ground platinum nitrate and the phosphorus-modified perovskite catalyst is adjusted to 300° C. The prepared phosphorus-modified perovskite oxide-supported platinum catalyst is denoted as Pt 0.005 / LaMnP 0.05 O3-300.

[0081] Verify the prepared Pt 0.005 / LaMnP 0.05 The catalytic combustion performance of O3-300 on toluene, the method is shown in Example 1, and the toluene catalytic combustion effect of the catalyst is shown in Table 1.

[0082] Example 9

[0083] Preparation of phosphorus-modified perovskite oxide supported platinum catalyst:

[0084] The method of Example 1 is referred to, except that the calcination temperature of the mixture of the ground platinum nitrate and the phosphorus-modified perovskite catalyst is adjusted to 500° C. The prepared phosphorus-modified perovskite oxide-supported platinum catalyst is denoted as Pt 0.005 / LaMnP 0.05 O3-500.

[0085] Verify the prepared Pt 0.005 / LaMnP 0.05The catalytic combustion performance of O3-500 on toluene, the method is shown in Example 1, and the toluene catalytic combustion effect of the catalyst is shown in Table 1.

[0086] Comparative Example 1

[0087] Preparation of perovskite oxide catalysts:

[0088] The preparation method of Example 1 is referred to, except that the addition of hydroxyethylidene diphosphonic acid and the loading of precious metals are omitted, and the obtained perovskite oxide catalyst is recorded as LaMnO3.

[0089] Comparative Example 2

[0090] Preparation of perovskite oxide supported platinum catalyst

[0091] The preparation method of Example 1 was followed, except that the addition of hydroxyethylidene diphosphonic acid was omitted. The prepared perovskite oxide-supported platinum catalyst was denoted as Pt 0.005 / LaMnO3.

[0092] Verify the prepared Pt 0.005 / LaMnO3 is used to test the catalytic combustion performance of toluene. The method is shown in Example 1, and the toluene catalytic combustion effect of the catalyst is shown in Table 1.

[0093] Verify the prepared Pt 0.005 / LaMnO3's catalytic combustion performance on ethyl acetate, the method is shown in Example 1, and the catalytic combustion effect of the catalyst on ethyl acetate is shown in Table 1.

[0094] Verify the prepared Pt 0.005 / LaMnO3 catalytic combustion performance of propane, the method is shown in Example 1, and the propane catalytic combustion effect of the catalyst is shown in Table 1.

[0095] Table 1 VOCs catalytic oxidation efficiency of each catalyst

[0096]

[0097]

[0098] It can be seen from the data in Table 1 that Example 1 is the optimal condition.

[0099] Embodiment 1 of the present invention (Pt 0.005 / LMP 0.05 O), Comparative Example 1 (LaMO) and Comparative Example 2 (Pt 0.005 / LMO) and the intermediate product LaMnP of Example 1 0.05 O3(LMP 0.05 O) Performance comparison of catalytic oxidation of toluene is shown in Figure 1 .

[0100] The performance comparison of the catalysts prepared in Example 1 and Example 2 of the present invention for catalytic oxidation of toluene is shown in FIG. Figure 2 .

[0101] The performance comparison of the catalysts prepared in Example 1 and Example 3 of the present invention for catalytic oxidation of toluene is shown in FIG. Figure 3 .

[0102] The performance comparison of the catalysts prepared in Examples 1, 4 and 5 of the present invention for catalytic oxidation of toluene is shown in FIG. Figure 4 .

[0103] The performance comparison of the catalysts prepared in Examples 1, 6 and 7 of the present invention for catalytic oxidation of toluene is shown in FIG. Figure 5 .

[0104] The performance comparison of the catalysts prepared in Examples 1, 8 and 9 of the present invention for catalytic oxidation of toluene is shown in FIG. Figure 6 .

[0105] Embodiment 1 of the present invention (Pt 0.005 / LMP 0.05 O) and Comparative Example 2 (Pt 0.005 The performance comparison of the catalyst prepared by using 1% mol / LMO for catalytic oxidation of ethyl acetate is shown in the figure. Figure 7 .

[0106] Embodiment 1 of the present invention (Pt 0.005 / LMP 0.05 O) and Comparative Example 2 (Pt 0.005 The performance comparison of the catalyst prepared by using 2-Hydroxy-1-nitropropane (LMO) catalyst for catalytic oxidation of propane is shown in Figure 8 .

[0107] Embodiment 1 of the present invention (Pt 0.005 / LMP 0.05 O), Comparative Example 1 (LaMO) and Comparative Example 2 (Pt 0.005 / LMO) and the intermediate product LaMnP of Example 1 0.05 O3(LMP 0.05 O) is shown in the XRD pattern Fig. 9 .

[0108] Embodiment 1 of the present invention (Pt 0.005 / LMP 0.05 O), and Comparative Example 2 (Pt 0.005 The performance comparison of the catalyst prepared by using 100 μmol / LMO) and 100 μmol / LMO before and after secondary high-temperature calcination is shown in the figure. Fig.10 .

[0109] like Fig.10As shown in FIG. 1 , the catalyst prepared according to the technical solution of the present invention and the catalyst not modified with phosphorus were subjected to secondary high-temperature calcination (600° C.) and then the catalytic performance was tested. The T 90 The temperature only dropped by 2-3°C, while that of the catalyst not modified by phosphorus dropped by 20°C, indicating that the phosphorus-modified perovskite oxide-loaded precious metal catalyst prepared according to the preparation method of the present invention has good heat resistance and stable structure.

[0110] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for preparing a phosphorus-modified perovskite oxide-supported noble metal catalyst, characterized in that: The following steps are involved: A lanthanum source, a manganese source, citric acid, ethylene glycol and a phosphorus source are mixed in water, heated for reaction, and the product obtained after the reaction is dried to obtain a phosphorus-modified perovskite oxide precursor; the phosphorus-modified perovskite oxide precursor is then calcined to obtain a phosphorus-modified perovskite oxide; and finally a noble metal source is mixed with the phosphorus-modified perovskite oxide and calcined to obtain the phosphorus-modified perovskite oxide-loaded noble metal catalyst; The usage ratio of the lanthanum source, manganese source, citric acid and ethylene glycol is 0.005 mol: 0.005 mol: 0.02 mol: 1.2 mL; The molar amount of phosphorus in the phosphorus source is 5% of the molar amount of manganese in the manganese source; The lanthanum source is lanthanum nitrate; the manganese source is manganese nitrate; The phosphorus source is hydroxyethylidene diphosphonic acid; The heating reaction temperature is 80°C and the time is 6 hours; the calcination temperature of the phosphorus-modified perovskite oxide precursor is 700°C and the holding time is 2 hours; The noble metal source is platinum nitrate; the mass of the noble metal in the noble metal source is 0.5% of the mass of the phosphorus-modified perovskite oxide; The calcination temperature after the noble metal source and the phosphorus-modified perovskite oxide are mixed is 400°C.

2. A phosphorus-modified perovskite oxide-supported noble metal catalyst obtained according to the method for preparing a phosphorus-modified perovskite oxide-supported noble metal catalyst according to claim 1.

3. Use of the phosphorus-modified perovskite oxide-supported noble metal catalyst according to claim 2 in the catalytic combustion of VOCs.

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