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CN-122006702-A - Cerium-manganese catalyst for low-temperature propane catalytic combustion and preparation method and application thereof

CN122006702ACN 122006702 ACN122006702 ACN 122006702ACN-122006702-A

Abstract

The invention discloses a cerium-manganese catalyst for low-temperature propane catalytic combustion, and a preparation method and application thereof; the method utilizes a continuous method under stirring, takes ammonium oxalate as a precipitator, manganese sulfate as a main catalytic active component and cerium sulfate as a trace auxiliary agent, and aims to provide a stable and efficient preparation method of a cerium-manganese catalyst and realize efficient degradation of propane catalytic combustion under low temperature conditions; the technical scheme is as follows: (1) preparing manganese sulfate and cerium sulfate mixed solution A; (2) preparing an ammonium oxalate aqueous solution B; (3) Uniformly stirring the uniform solution at normal temperature for 15min; (4) Pumping the obtained solutions A, B into peristaltic pumps A, B respectively, and mixing with a pipeline to obtain a product; (5) Centrifuging, washing with deionized water and alcohol, and drying at 60 degrees to obtain a solid product; (6) Further calcining the solid product in a muffle furnace to obtain a finished product; relates to petrochemical engineering, thermal catalytic material and environmental protection technology.

Inventors

  • WANG XUYU
  • JI HONGBING
  • ZHANG XIAOMING

Assignees

  • 江苏科技大学
  • 江苏中江材料技术研究院有限公司

Dates

Publication Date
20260512
Application Date
20260326

Claims (10)

  1. 1. The cerium-manganese catalyst for low-temperature propane catalytic combustion and the preparation method and the application thereof are characterized by comprising the following steps in sequence: (1) Preparing a manganese sulfate and cerium sulfate mixed solution A; (2) Preparing an ammonium oxalate aqueous solution B; (3) Uniformly stirring the uniform solution at normal temperature for 15min; (4) Pumping the obtained solutions A, B into peristaltic pumps A, B respectively, and mixing with a pipeline to obtain a product; (5) Centrifuging, washing with deionized water and alcohol, and drying at 60 degrees to obtain a solid product; (6) The solid product is further calcined in a muffle furnace to obtain a finished product, which relates to the technical fields of petrochemical industry, thermocatalytic materials and environmental protection.
  2. 2. The method for preparing a cerium-manganese catalyst according to claim 1, wherein the molar ratio of cerium sulfate to manganese sulfate in the step (1) is 1:50 (mmol).
  3. 3. The method for preparing a cerium-manganese catalyst according to claim 1, wherein the aqueous ammonium oxalate solution in the step (2) is saturated ammonium oxalate.
  4. 4. The method for preparing a cerium-manganese catalyst according to claim 1, wherein the stirring rotation speed in the step (3) is 800r/min.
  5. 5. The method for preparing a cerium-manganese catalyst according to claim 1, wherein the peristaltic pump flow rate in the step (4) is 30-50 ml/min.
  6. 6. The method for preparing the cerium-manganese catalyst according to claim 1, wherein the centrifugation parameter in the step (5) is 8000 r/min for 5min, the washing conditions are deionized water and ethanol for 3 times, and the drying temperature is 60 ℃ and the time is 12h.
  7. 7. The method for preparing a cerium manganese catalyst according to claim 1, wherein the calcination temperature in the step (6) is 300 ℃ and the calcination time is 2 hours.
  8. 8. A cerium-manganese catalyst prepared by the method of any one of claims 1 to 7.
  9. 9. The method for catalyzing the complete oxidation of propane at low temperature by adopting the cerium-manganese catalyst as claimed in claim 8, wherein the catalysis conditions are that the raw material gas comprises 5% of propane, 20% of oxygen and the balance nitrogen, and the airspeed is 30000 mL/(g.h), and the reaction temperature is 100-300 ℃.
  10. 10. The cerium-manganese catalyst provided by the invention is applied to the field of thermocatalysis. The catalyst can be efficiently degraded by catalytic combustion of low-temperature propane.

Description

Cerium-manganese catalyst for low-temperature propane catalytic combustion and preparation method and application thereof Technical Field The invention relates to a catalyst, in particular to a cerium-manganese catalyst for catalytic combustion of low-temperature propane, and also relates to a preparation method of the cerium-manganese catalyst, belonging to the technical fields of petrochemical industry, thermal catalytic materials and environmental protection. Background Propane is one of the most stable and difficult components to remove from alkanes as a mass-produced substance in industrial waste gas and automobile exhaust gas. The direct discharge of the catalyst is easy to cause atmospheric photochemical pollution, greenhouse effect and human health hazard, and the realization of efficient purification of propane becomes an important research direction in the fields of industrial waste gas treatment and environmental catalysis. Catalytic complete oxidation is the mainstream technology of harmless treatment of propane, and can directionally convert propane into CO 2 and H 2 O at a lower temperature. At present, the propane oxidation catalyst is mainly divided into a noble metal catalyst and a non-noble metal catalyst, wherein the noble metal catalyst has the problems of high raw material cost, easiness in sintering at high temperature, poor poisoning resistance and the like, and is difficult to meet the requirements of large-scale industrial application although the noble metal catalyst has excellent low-temperature activity. In recent years, cerium-based materials in transition metals are often used as an auxiliary agent to be compounded with manganese-based oxides to improve catalytic performance due to excellent oxygen storage and release capacity, oxygen vacancy regulation effect and structure stabilization, however, the conventional intermittent preparation process is mostly adopted by the conventional cerium-manganese catalyst, and the problems of uneven distribution of metal components, weak interface bonding strength, easy sintering of crystal grains in the roasting process and the like exist, so that the Ce-O-Mn synergistic effect is not outstanding, the surface active oxygen species generation and circulation efficiency are limited, and the low-temperature propane oxidation activity and stability still cannot meet the requirements of practical working conditions. Meanwhile, the existing preparation process is difficult to realize accurate doping of active components and uniform precipitation of precursors, and further limits optimization of oxygen transmission capacity and catalytic dynamics of the catalyst. Therefore, the cerium-manganese bimetallic catalyst which is simple and convenient in preparation process, uniform in component dispersion, high in low-temperature activity and good in stability is developed, the efficient and complete oxidation of propane under mild conditions is realized, and the cerium-manganese bimetallic catalyst has important practical significance and application value for improving the treatment efficiency of industrial VOCs and reducing the catalytic purification cost. Disclosure of Invention In view of the above problems, the present invention aims to provide a preparation method of a cerium-manganese catalyst and a catalyst with high catalytic activity for catalytic combustion of propane at low temperature based on the problems faced by transition metal-based catalysts. In order to achieve the above object, the first technical solution provided by the present invention is as follows: The preparation method of the cerium-manganese catalyst sequentially comprises the following steps: (1) Preparing a manganese sulfate and cerium sulfate mixed solution A; (2) Preparing an ammonium oxalate aqueous solution B; (3) Uniformly stirring the uniform solution at normal temperature for 15min; (4) Pumping the obtained solutions A, B into peristaltic pumps A, B respectively, and mixing with a pipeline to obtain a product; (5) Centrifuging, washing with deionized water and alcohol, and drying at 60 degrees to obtain a solid product. (6) The solid product is further calcined in a muffle furnace to obtain a finished product, which relates to the technical fields of petrochemical industry, thermocatalytic materials and environmental protection. Further, in the preparation method of the cerium-manganese catalyst, the molar ratio of cerium sulfate to manganese sulfate in the step (1) is 1:50 (mmol). Further, in the preparation method of the cerium-manganese catalyst, the ammonium oxalate aqueous solution in the step (2) is saturated ammonium oxalate. Further, in the preparation method of the cerium-manganese catalyst, the stirring rotating speed in the step (3) is 800r/min. Further, in the preparation method of the cerium-manganese catalyst, the flow of the peristaltic pump in the step (4) is 30-50 ml/min. Further, in the preparation method of the cerium-manganese catalyst, the ce