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Noble metal catalyst for deeply removing CO from synthesis gas and preparation method thereof

A precious metal catalyst and catalyst technology, which can be used in the direction of catalytic treatment of combustible gas, etc., can solve problems such as inability to meet, and achieve the effects of low cost, good CO oxidation activity, and improved dispersion.

Inactive Publication Date: 2010-11-10
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve this problem, the Chinese patent CN1397485A has improved the above-mentioned technology, using γ-Al 2 o 3 As a carrier, Li, Na, K and other additives are added, so that the platinum catalyst can still reduce CO to below 100PPM when the content is less than 2%, but it cannot meet the requirement that the CO concentration of the PEMFC electrode is less than 10PPM. The selectivity of the catalyst is only 30-40%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method for a noble metal catalyst for CO deep removal in syngas: (1) Weigh 4.85g macroporous γ-Al 2 o 3 carrier, the water absorption is 4.85×1.06=5.14ml. Take 30mg / ml of H 2 PtCl 6 ·6H 2 O solution 2.2ml, add distilled water to 5.14ml. Pour impregnating solution into macroporous γ-Al 2 o 3 , stirred slowly for 1 hour, stood still for 24 hours, and dried at 115°C for 5-6 hours to constant weight. Calcined at 500°C for 3.5 hours in a muffle furnace using temperature programming, and took it out after cooling down to room temperature; macroporous γ-Al 2 o 3 The carrier adopts spherical macroporous γ-Al produced by Tianjin Research Institute of Chemical Industry 2 o 3 Carrier, specific surface area 270m 2 / g, the pore diameter is 7.3nm, the bulk density is 0.74g / ml, and the purity is 99.6%. Dry at 120°C until constant weight, screen 5g of 20-30 mesh particles and measure its saturated water absorption to be 5.3ml, then macroporous γ-Al 2 o 3 The...

Embodiment 2

[0029] A preparation method of a noble metal catalyst for the deep removal of CO in syngas: Weigh 9.64g of macroporous γ-Al 2 o 3 carrier, the water absorption is 9.64×1.06=10.2ml. Take 30mg / ml of H 2 PtCl 6 ·6H 2 O solution 4.4ml, add distilled water to 10.2ml. Pour impregnating solution into macroporous γ-Al 2 o 3 , stirred slowly for 1 hour, stood still for 24 hours, and dried at 120°C for 4 hours to constant weight. Calcined at 500° C. for 3.5 hours in a muffle furnace using a temperature program, and took it out after cooling down to room temperature. Macroporous γ-Al 2 o 3 The carrier adopts spherical macroporous γ-Al produced by Tianjin Research Institute of Chemical Industry 2 o 3 Carrier, specific surface area 272m 2 / g, the pore diameter is 7.4nm, the bulk density is 0.72g / ml, and the purity is 99.6%.

[0030] Take 3.24ml of 40mg / ml ferric nitrate solution, add distilled water to dilute to 10.2ml for use; take 80mg / ml potassium nitrate solution 2.9ml, ad...

Embodiment 3

[0034] A preparation method of a noble metal catalyst for the deep removal of CO in syngas: Weigh 7.64g of macroporous γ-Al 2 o 3 carrier, the water absorption is 7.64×1.06=8.1ml. Take 100mg / ml H 2 PtCl 6 ·6H 2 O solution 3.52ml, add distilled water to 8.1ml. Pour impregnating solution into macroporous γ-Al 2 o 3 , stirred slowly for 1 hour, stood still for 9 hours, and dried at 130°C for 5 hours to constant weight. Calcined at 600° C. for 2 hours in a muffle furnace using a temperature program, and took it out after cooling down to room temperature. Macroporous γ-Al 2 o 3 The carrier adopts spherical macroporous γ-Al produced by Tianjin Research Institute of Chemical Industry 2 o 3 Carrier, specific surface area 273m 2 / g, the pore diameter is 7.5nm, the bulk density is 0.71g / ml, and the purity is 99.6%.

[0035] Take 4.61ml of 30mg / ml copper nitrate solution, add distilled water to dilute to 8.1ml for use; take 6.19ml of 100mg / ml sodium nitrate solution, add dis...

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Abstract

The invention discloses a noble metal catalyst for deeply removing CO from a synthesis gas and a preparation method thereof. The catalyst is a supported catalyst with a single carrier and multiple activity components, wherein macropore gama-Al2O3 serves as a carrier; noble metal Pt serves as a main catalytic active ingredient; a cocatalyst A and a cocatalyst B are added; the cocatalyst A is one or more of Ag, Fe, Cu and Ni; and the cocatalyst B is one or more of K, Na and Li. When the noble metal catalyst is prepared, the carrier, namely the gama-Al2O3, is soaked with aqueous solution of H2PtCl6.6H2O and then the soaked product in equal volume is soaked with nitrate solution of the cocatalyst A and the cocatalyst B step by step. The noble metal catalyst has the advantages of simple preparation process, high reaction activity, wide temperature operation range, high selectivity and stability and the like. After being normally used, the noble metal catalyst does not need to be pre-reduced; the performance is not decayed after multiple times of starting; and the catalyst is suitable for purifying and removing trace CO from a distributed fuel cell hydrogen producing system.

Description

technical field [0001] The invention relates to natural gas reforming technology, in particular to a precious metal catalyst used for preferential oxidation and removal of trace CO in natural gas reforming gas and a preparation method thereof. Background technique [0002] Fuel cells have been recognized as an efficient energy conversion device that converts chemical energy into electrical energy, and the discharge is water, which will not cause harm to the environment. best way. Proton exchange membrane fuel cell (PEMFC) has the advantages of quick start, high efficiency and no pollution, and it is a kind of more research. The ideal fuel for PEMFC is pure hydrogen. However, due to the immature hydrogen storage technology, small-scale distributed hydrogen production has become the best way to supply hydrogen. At present, the active components of the anode materials of proton exchange membrane fuel cells are generally noble metals such as Pt and Ru, and a trace amount of CO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/66C10K3/04
Inventor 解东来李瑞军
Owner SOUTH CHINA UNIV OF TECH