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Supported catalyst, and preparation method and application thereof

A technology of supported catalysts and combustion catalysts, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as environmental pollution, unfavorable industrialization, equipment corrosion, etc., achieve high activity and reduce consumption , good stability effect

Inactive Publication Date: 2020-05-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The disadvantages in the preparation methods of these catalysts disclosed above are that the acid or alkali used in the carrier treatment is likely to cause equipment corrosion and pollute the environment, which is not conducive to its industrialization

Method used

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  • Supported catalyst, and preparation method and application thereof
  • Supported catalyst, and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0079] For the preparation method of cerium-zirconium composite oxide, refer to patent CN106268856A.

[0080] For the preparation method of titanium-manganese composite oxide, refer to the patent CN104226233B.

[0081] For the preparation method of cerium-zirconium-copper composite oxide, refer to patent CN105727965B.

[0082] Analytic method is as follows in the embodiment of the application:

[0083] On-line chromatographic analysis was performed using an Agilent 7890A gas chromatograph equipped with a FID detector.

[0084] The conversion rate of this application is calculated as follows:

[0085]

[0086] where CH 4in and CH 4out CH for inlet and outlet respectively 4 concentration.

Embodiment 1

[0088] Accurately weigh 5.00 g of the cerium-titanium composite oxide carrier prepared by the homogeneous precipitation method, the cerium-titanium molar ratio is 1:1, the particle size is 40-60 mesh, and the solid particles are placed in the reaction tube with a hydrogen volume content of 10%. The hydrogen and nitrogen mixed gas is used for reduction, the reduction temperature is 400°C, and the reduction time is 2h. After cooling down to room temperature, inject 0.42mL of 13.0% Pd(NO 3 ) 2 Aqueous solution and 2mL deionized water, after standing for 6h, washed, filtered, and the obtained solid was placed in an oven at 120°C for 10h. The dried solid was calcined at 550 °C for 2 h under air atmosphere. A CeTi-Pd catalyst was obtained, marked as sample 1#. Wherein, the weight content of Pd in ​​sample 1# is 1%.

[0089] Using the same preparation method as sample 1#, the difference is that the volume content of hydrogen in the mixed gas is 3%, the reduction temperature is 50...

Embodiment 2

[0095] Accurately weigh 5.00 g of the cerium-zirconium oxide carrier prepared by the co-precipitation method, the cerium-zirconium molar ratio is 1:1, the particle size is 40-60 mesh, put the solid particles in a beaker, and add 60 mL of hydrazine hydrate with a mass concentration of 10%. Solution, after stirring for 180min, suction filter, wash 5 times with deionized water, inject 0.25mL mass fraction in the beaker and be 13.0% Pd(NO 3 ) 2 Aqueous solution and 2mL deionized water, after standing for 6h, washed, filtered, and the obtained solid was placed in an oven at 120°C for 10h. The dried solid was calcined at 550 °C for 2 h under air atmosphere. A CeZr-Pd catalyst was obtained, designated as sample 6#. Wherein, the weight content of Pd in ​​sample 6# is 0.6%.

[0096] Using the same preparation method as sample 6#, the difference is that the stirring time is 2h, to obtain a supported CeZr-Pd catalyst, labeled 7#. Using the same preparation method as sample 6#, the di...

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Abstract

The invention discloses a supported catalyst. The supported catalyst comprises an active component and a carrier; the active component comprises an active metal element, and the active metal element is selected from at least one of noble metal elements; the carrier comprises a metal oxide carrier subjected to reduction treatment; the metal oxide carrier comprises a carrier metal element; and the carrier metal element comprises at least one metal element which is subjected to reduction treatment and has a variable chemical valence. The prepared catalyst is suitable for the catalytic combustionprocess of CH4, CO and various volatile organic compounds (VOCs); and compared with supported catalysts prepared through a traditional loading method, the supported catalyst of the invention has highactivity and good stability, and reduces the use amount of the noble metal.

Description

technical field [0001] The application relates to a supported catalyst and its preparation method and application, belonging to the field of catalysts and its preparation. Background technique [0002] CH 4 , CO and various VOCs, as a pollution source that endangers human health and the natural environment, have attracted more and more attention. . Catalytic combustion treatment has a wide concentration of exhaust gas, no secondary pollution, and is the best choice for purifying CH at home and abroad. 4 , CO and various VOCs are the most effective methods; and with the improvement of corporate environmental awareness, everyone's requirements for environmental protection equipment have also increased accordingly, and the application of catalytic combustion in the field of pollutant purification will be further strengthened. [0003] Precious metal catalysts such as Pd and Pt are widely used in the catalytic combustion of CO, hydrocarbons and various VOCs and three-way cata...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J23/656B01J23/89B01J37/18B01J37/16F23G7/07
CPCB01J23/63B01J23/6562B01J23/894B01J37/16B01J37/18F23G7/07F23G2209/14
Inventor 王胜王树东丁亚袁中山汪明哲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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