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Catalyst Au/MnOx-CeO2 used for preferential oxidation of carbon monoxide and preparation method thereof

A technology of oxidation catalyst and carbon monoxide, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. It can solve the problems of low CO selectivity and low catalyst PROX activity, etc. To achieve the effect of improved catalytic activity and thermal stability

Inactive Publication Date: 2012-11-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst produced by the traditional deposition-precipitation method has low PROX activity and relatively low selectivity to CO.

Method used

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  • Catalyst Au/MnOx-CeO2 used for preferential oxidation of carbon monoxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1 g of chloroauric acid (HAuCl 4 4H 2 O) be placed in 250mL volumetric flask, add deionized water, be mixed with the active component precursor solution (solution A) that Au concentration is 1.30g / L. Weigh 5.361g Ce(NO 3 ) 3 ·6H 2 O and 3.026gMn(CH 3 COO) 2 4H 2 O was placed in a beaker, and 200 mL of deionized water was added, stirred and dissolved to form a carrier precursor solution (solution B). Under mechanical stirring, add 0.5M Na 2 CO 3 Make it precipitate, adjust the pH = 10.50, keep it constant and stir continuously for 4.5h, then age in a water bath at 50°C for 2h, obtain a precipitate, filter, and dry at a constant temperature of 120°C for 12h, then at 5°C / min The heating rate was increased to 400 ° C, and the constant temperature was roasted for 4 hours to obtain MnO x -CeO 2 Composite oxide support (MnO x for Mn 2 o 3 and MnO 2 mixture). Weigh 3.0g of the obtained carrier and put it in a beaker, add 150mL of deionized water, stir to dissolv...

Embodiment 2

[0019] Weigh 5.361g Ce(NO 3 ) 3 ·6H 2 O and 3.026g Mn(CH 3 COO) 2 4H 2 O was placed in a beaker, and 200 mL of deionized water was added, stirred and dissolved to form a carrier precursor solution (solution B). Under mechanical stirring, add 0.5M Na 2 CO 3 Make it precipitate, adjust the pH = 10.50, keep it constant and stir continuously for 4.5h, then age in a water bath at 50°C for 2h, obtain a precipitate, filter, and dry at a constant temperature of 120°C for 12h, then at 5°C / min The heating rate was increased to 400 ° C, and the constant temperature was roasted for 4 hours to obtain MnO x -CeO 2Composite oxide carrier. Weigh 3.0g of the obtained carrier and put it in a beaker, add 150mL of deionized water, stir to dissolve, and use an ultrasonic cleaner with a power of 100W and a frequency of 40KHz to assist in dissolving for 5 minutes; measure 23.1mL of solution A, put it in a beaker, add Prepare 152mL of 1.0mmol / L Au solution with deionized water, and then add...

Embodiment 3

[0022] Weigh 5.361g Ce(NO 3 ) 3 ·6H 2 O and 3.026g Mn(CH 3 COO) 2 4H 2 O was placed in a beaker, and 200 mL of deionized water was added, stirred and dissolved to form a carrier precursor solution (solution B). Under mechanical stirring, add 0.5M Na 2 CO 3 Make it precipitate, adjust the pH = 10.50, keep it constant and stir continuously for 4.5h, then age in a water bath at 50°C for 2h, obtain a precipitate, filter, and dry at a constant temperature of 120°C for 12h, then at 5°C / min The heating rate was increased to 400 ° C, and the constant temperature was roasted for 4 hours to obtain MnO x -CeO 2 Composite oxide carrier. Weigh 3.0g of the obtained carrier and put it in a beaker, add 150mL of deionized water, stir to dissolve, and use an ultrasonic cleaner with a power of 100W and a frequency of 40KHz to assist in dissolving for 5 minutes; measure 23.1mL of solution A, put it in a beaker, add Prepare 152mL of 1.0mmol / L Au solution with deionized water, and then ad...

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Abstract

The invention relates to a catalyst Au / MnOx-CeO2 used for the preferential oxidation of carbon monoxide and a preparation method thereof. Au serves as an active component and compound oxide MnOx-CeO2 serves as a carrier. The mass ratio of the compound oxide and Au is 100:0.5-5.0. The contents of compound oxide MnOx and compound oxide CeO2 are based on Ce / Mn mole ratio of 1:1. Cerous nitrate, manganese acetate and chloroauric acid are taken as raw materials to prepare MnOx-CeO2 compound oxide carrier. After the carrier is dispersed by ultrasound, the precipitation product obtained by taking chloroauric acid as the raw material and sodium hydroxide as a precipitator is roasted to obtain Au / MnOx-CeO2 compound oxide load gold catalyst. By introducing ultrasound assisting dispersion technology, the active component is evenly dispersed on the surface of the carrier in the deposition-precipitation process. Therefore, the enrichment phenomenon of Au particles in deposition and precipitation is avoided when using the traditional deposition-precipitation method to prepare the catalyst. The sintering agglomeration of the Au particles is unlikely to happen during roasting, thereby greatly improving PROX catalytic activity and thermostability and better satisfying the requirement of reducing the CO concentration to below 10ppm in proton exchange membrane fuel cells (PEMFCs).

Description

technical field [0001] The present invention relates to the preparation technology of CO preferential oxidation catalyst, especially a kind of highly active carbon monoxide preferential oxidation catalyst Au / MnO x -CeO 2 and its preparation method. Background technique [0002] In recent years, in order to alleviate the increasingly tense energy demand and promote the development of proton exchange membrane fuel cells (PEMFCs) fueled by high-purity hydrogen, it is necessary to eliminate the small amount of CO produced during steam reforming to below 10 ppm. Therefore, the development of high-efficiency catalysts with high CO oxidation activity and selectivity under hydrogen-rich conditions has important theoretical significance and application prospects. Nano-Au has been used as an active component of CO preferential oxidation (PROX) catalysts due to its excellent CO oxidation activity, good water resistance, stability, and humidity enhancement effect, with good storage / re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/68B01J37/34B01J37/03C01B3/58H01M8/06H01M8/0606H01M8/0668
CPCY02E60/50Y02P70/50
Inventor 孟明涂云宝查宇清
Owner TIANJIN UNIV
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