Supported metal nano-cluster catalyst for CO oxidation

A metal nanocluster, catalyst technology, applied in physical/chemical process catalysts, catalyst activation/preparation, organic compound/hydride/coordination complex catalysts, etc., can solve the problems of decreased catalytic activity, poor stability, etc. Reaction stability, good stability, the effect of improving CO oxidation performance and stability

Inactive Publication Date: 2013-12-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, although traditional nano-gold catalysts have shown good low-temperature CO oxidation performance, many researchers have found that nano-gold catalysts have poor stability under low-temperature operation, and their catalytic activity shows a downward trend with the reaction time.

Method used

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  • Supported metal nano-cluster catalyst for CO oxidation
  • Supported metal nano-cluster catalyst for CO oxidation
  • Supported metal nano-cluster catalyst for CO oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to the literature description (Jin R. et al., J Am Chem Soc., 2008, 130, 5883-5885) kinetically controlled size concentration method synthesis (Au) 25 (SR) 18 Metal nanoclusters; where: S is sulfur, R=-CH 2 CH 2 Ph;

[0028] Take 490mg CeO 2 Soak the oxide powder carrier to 10mL (M 1 ) n (SR) m CH 2 Cl 2 solution (with Au 25 (SR) 18 10 mg) for 24 hours, dried to obtain 2% Au 25 (SR) 18 / CeO 2 Catalyst, denoted as catalyst A, the thermogravimetric analysis result of this catalyst shows, 160 ℃ of catalysts do not decompose in air, still keep the stable supported metal nano-cluster structure.

Embodiment 2

[0030] The preparation steps are the same as in Example 1, except that (Au) 25 (SR) 18 Metal nanoclusters changed to (Au) 38 (SR) 24 Metal nanoclusters; fabricated Au 38 (SR) 24 / CeO 2 Catalyst, denoted as catalyst B.

Embodiment 3

[0032] The preparation steps are the same as in Example 1, except that (Au) 25 (SR) 18 Metal nanoclusters changed to (Au) 144 (SR) 60 metal nanoclusters, made of Au 144 (SR) 60 / CeO 2 Catalyst, denoted as catalyst C.

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Abstract

The invention discloses a supported metal nano-cluster catalyst for CO oxidation. The formula of the supported metal nano-cluster catalyst for CO oxidation is (M1)n(SR)m/M'xOy, wherein (M1)n(SR)m is metal nano cluster, M1 is a metal such as Au, Ag or an alloy thereof, SR (R=CH2CH2Ph) is an organic thiol ligand of the metal nano cluster, and M'xOy is a metal oxide carrier such as CeO2, ZrO2 and the like. In the supported metal nano-cluster catalyst, the metal nano cluster composition (M1)n(SR)m has the characteristics that the thermal stability is good, the size distribution of active nano metal particles is controllable, and the like. The supported metal nano-cluster catalyst embodies an excellent CO oxidation performance, and especially shows a stable CO oxidation performance in the atmosphere of a raw material gas added with water vapor. When the supported metal nano-cluster catalyst such as Au25 (SR) 18/CeO2 catalyst is used, the CO conversion rate at 80 DEG C is 94%, and the CO conversion rate at 100 DEG C is 100%.

Description

technical field [0001] The present invention relates to supported type metal nanocluster catalyst, specifically relate to a kind of expression formula for CO oxidation is (M 1 ) n (SR) m / M' x o y supported metal nanocluster catalysts. Background technique [0002] Supported nano-gold catalysts are a new class of catalytic materials. Since Haruta et al. first reported supported nano-gold catalysts, supported nano-gold catalysts have been extensively studied. Super strong CO oxidation performance. CO oxidation is an important process that can be applied in many fields, such as the removal of trace CO impurities in hydrogen for fuel cells, the treatment of CO in automobile exhaust, and so on. Although a great deal of research has been done on supported nano-gold catalysts, the mechanism of nano-gold-catalyzed CO oxidation is still under debate. The gold catalyst prepared by the conventional impregnation method has residual gold ions or a small amount of atomic clusters ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J37/02C01B31/20C01B32/50
Inventor 葛庆杰聂晓涛徐恒泳金荣超
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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