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CO selective oxidation catalyst in hydrogen-enriched atmosphere, as well as preparation and application thereof

A technology of selective oxidation and hydrogen-rich atmosphere, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve poor catalytic activity, unfriendly environment, raw material price Advanced problems, to achieve the effect of improving utilization rate, improving catalyst activity, and small scale

Active Publication Date: 2013-09-18
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

The disadvantages are that the price of raw materials is high, and the optimal reaction temperature of the catalyst is high.
At present, there are few reports on the application of Ir catalysts in selective oxidation of CO
year 2004, CeO 2 , CeO 2 -ZrO 2 Composite oxide supported Ir catalysts are used for this reaction (Appl.Catal.B, 2004, 54, 59), but these Ir catalysts are expensive Ir[CH(COCH 3 ) 2 ] 3 As a precursor, organic acetone solution is used as solvent, which is not friendly to the environment, and shows poor catalytic activity at low temperature (CO conversion rate is less than 50% at 60 °C)
At present, the Ir catalyst can only show good CO selective oxidation performance at a relatively high reaction temperature, and cannot be applied to the elimination of trace CO in reformed gas.
So far, no Ir catalysts have been reported for the selective oxidation of CO at low temperatures

Method used

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  • CO selective oxidation catalyst in hydrogen-enriched atmosphere, as well as preparation and application thereof
  • CO selective oxidation catalyst in hydrogen-enriched atmosphere, as well as preparation and application thereof
  • CO selective oxidation catalyst in hydrogen-enriched atmosphere, as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 3.78g of Fe(NO 3 ) 3 9H 2 O with 0.16 wt% H 2 IrCl 6 Add 1.25g of the solution to 100ml of deionized water and mix well, then add dropwise into 100ml of 0.3mol / L NaOH solution under strong stirring to form a coprecipitate, adjust the pH value to 9, continue stirring at 80°C for 3h, and let it stand for 1h. Filter, wash with hot water, and place at 80° C. for 16 h to dry the catalyst to obtain a 0.2% Ir / Fe(OH)x catalyst.

Embodiment 2

[0032] 3.78g of Fe(NO3 ) 3 9H 2 O with 0.16 wt% H 2 IrCl 6 Add 3.75g of the solution to 100ml of deionized water and mix well, then add dropwise into 100ml of 0.3mol / L NaOH solution under strong stirring to form a coprecipitate, adjust the pH value to 9, continue stirring at 80°C for 3h, and let it stand for 1h. Filter, wash with hot water, and place at 80°C for 16 hours to dry the catalyst to obtain a 0.7% Ir / Fe(OH)x catalyst.

Embodiment 3

[0034] 3.78g of Fe(NO 3 ) 3 9H 2 O with 0.16 wt% H 2 IrCl 6 Add 6.25g of the solution to 100ml of deionized water and mix well, then add it dropwise into 100ml of 0.3mol / L NaOH solution under strong stirring to form a co-precipitation, adjust the pH value to 9, continue stirring at 80°C for 3h, and let it stand for 1h. Filter, wash with hot water, and place at 80° C. for 16 h to dry the catalyst to obtain a 1.2% Ir / Fe(OH)x catalyst.

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Abstract

The invention relates to a CO selective oxidation catalyst in a hydrogen-enriched atmosphere, in particular to a ferric hydroxide and iridium (Ir) dual-component catalyst, as well as preparation and application thereof. In the catalyst taking ferric hydroxide and noble metal Ir as dual active components, the noble metal Ir is highly dispersed on the ferric hydroxide, wherein the content of the Iraccounts for 0.1 to 5 percent of the total mass of the catalyst. The catalyst is suitable for CO selective oxidation at lower temperature in the hydrogen-enriched atmosphere, can completely convert trace CO into CO2 in the hydrogen-enriched atmosphere in a wide temperature range (20 to 60 DEG C), and can be applied to a proton exchange membrane fuel cell power generation system taking reformed gas as a hydrogen source to remove trace CO in the reformed gas, which is toxic to fuel cell electrocatalyst.

Description

technical field [0001] The invention relates to a catalyst for selective oxidation of CO in a hydrogen-rich atmosphere, in particular to an iron hydroxide and iridium two-component catalyst for eliminating trace CO in a hydrogen source used in a fuel cell at a low temperature, and its preparation and application. Background technique [0002] Fuel cell is currently one of the most important technologies for utilizing hydrogen energy. It has the advantages of high efficiency and low environmental pollution, and is an environmentally friendly energy utilization technology. Among various fuel cell technologies, the proton exchange membrane fuel cell (PEMFC) has the characteristics of low emission, convenient start-up, high specific power, and mild working conditions, and is expected to become one of the most competitive power sources to replace current automobile power. The fuel hydrogen used in it is generally obtained by water vapor reforming, partial oxidation and thermal re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J37/03C01B3/58
Inventor 林坚张涛王晓东乔波涛王爱琴李林黄延强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI