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Noble metal catalyst and preparation method and application thereof

A noble metal catalyst and noble metal technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as limited catalytic activity and complicated preparation process, and achieve increased Effects of activity, high catalytic activity and sintering resistance

Active Publication Date: 2018-10-12
吉林晟航科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the defects of complex preparation process and limited catalytic activity of noble metal catalysts in the prior art, and further provide a noble metal catalyst with simple preparation, high catalytic activity and sintering resistance

Method used

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  • Noble metal catalyst and preparation method and application thereof
  • Noble metal catalyst and preparation method and application thereof
  • Noble metal catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 100mg KBr in 20ml deionized water, then heat the solution to 60°C for tens of minutes to accelerate the dissolution, PdCl 2 And NaCl preparation concentration is 5×10 -4 mol / L Na 2 PdCl 4 aqueous solution, then mixed with 1 x 10 -3 mol / L of SnCl 2 The aqueous solution was sequentially added to the above KBr solution. The above mixed solution was heated at 60° C. for 1 hour. Centrifuge after cooling, wash the obtained solid twice with water and once with ethanol, and then dry it.

[0032] Carry out XRD and TEM test to the catalyst that present embodiment makes, its result is as follows figure 1 with figure 2 It can be seen from the lattice fringe changes observed by the transmission electron microscope that part of the noble metal has entered the various substituted divalent tin ions of tin dioxide. EDS analysis was carried out, and the results are shown in Table 1. Among them, the Cu and Si elements come from the self-contained elements of the instrume...

Embodiment 2

[0036] 100 mg of KBr was dissolved in 20 ml of deionized water, and the solution was heated to 60 °C for tens of minutes. Using PdCl 2 And NaCl preparation concentration is 5×10 -5 mol / L Na 2 PdCl 4 aqueous solution, then mixed with 1 x 10 -4 mol / L SnCl 2The aqueous solution was sequentially added to the above KBr solution. The above mixed solution was heated at 60° C. for 1 hour. Centrifuge after cooling, wash the obtained solid twice with water and once with ethanol, and then dry it.

Embodiment 3

[0038] Dissolve 50mg KBr in 20ml deionized water, add 5×10 -3 K in mol / L 2 PtCl 4 aqueous solution, then mixed with 1 x 10 -2 mol / L of SnCl 2 The aqueous solution was sequentially added to the above KBr solution. The above mixed solution was heated at 100°C for 0.5 hours. Centrifuge after cooling, wash the obtained solid twice with water and once with ethanol, and then dry it.

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Abstract

The invention provides a noble metal catalyst, which employs noble metal as a first active component and stannic oxide as a second active component, and a methane combustion catalyst having high catalytic activity and sintering-resistant performance is obtained. The stannic oxide can protect the noble metal component from sintering, contains abundant and active surface oxygen vacancy, the latticeoxygen in a body phase has certain activity, at the same time, the surface of the stannic oxide has Lewis acid center, realizes effective catalysis, and is in favor of a catalytic combustion reactionof methane. A part of the noble metal is introduced into lattice of stannic oxide to substitute the divalent tin ions, and can increase the cavity concentration, so that the free electron concentration is reduced, adsorbed oxygen ions can be formed at the surface of the catalyst, the noble metal catalyst is in favor of generation of an oxidation reaction by the reductibility gas methane at the surface of the catalyst through oxygen ion adsorption, and the activity of the catalyst is increased.

Description

technical field [0001] The invention belongs to the field of noble metal catalysts, in particular to a catalyst capable of catalyzing methane combustion. Background technique [0002] Methane is a greenhouse gas whose greenhouse effect is 25 times that of carbon dioxide with the same number of molecules. In recent years, with the development of industry, the content of methane in the atmosphere has been increasing day by day, and its man-made sources are mainly the exploitation and use of coal mines and natural gas. Coal mine exhaust air contains low concentration of methane, although its concentration is generally less than 0.75%, but due to the large air volume of coal mine exhaust air, the greenhouse effect caused by the methane brought into the atmosphere cannot be ignored. Methane in coal mine exhaust air cannot be removed by direct combustion because its concentration is too low, so researchers have developed catalysts that catalyze the combustion of low-concentration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62F23G7/07
CPCB01J23/626F23G7/07
Inventor 刘大鹏冯锡岚李强
Owner 吉林晟航科技发展有限公司
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