Catalyst for carbon monoxide oxidation in hydrogen and preparation method thereof

A carbon monoxide and catalyst technology, which is applied to a catalyst for selective oxidation of carbon monoxide in hydrogen at low temperature and its preparation field, can solve the problems of high raw material price, reduced fuel utilization efficiency, low catalyst selectivity, etc., and achieves low price, reduced preparation cost, and improved The effect of energy efficiency

Inactive Publication Date: 2007-10-31
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

Metal oxide supported metal catalysts are catalysts of choice for low temperature elimination of carbon monoxide, Au / Al 2 o 3 Catalyst has the selectivity of 50% carbon monoxide oxidation at 100 ℃, and the particle size of gold is about at 5-10nm [G.K.Bethke, H.H.Kung, Appl.Catal.A 194(2000) 43] its weak point is: raw material price is relatively low High Catalyst Low Selectivity
Because the amount of oxygen increases, although the conversion rate of carbon monoxide can be increased, hydrogen is consumed at the same time, and the selectivity also decreases, which will reduce the utilization efficiency of fuel; silver, as a better oxidation catalyst, has been successfully used in ethylene Epoxidation reaction, and also shows good activity for low-temperature oxidation of carbon monoxide [G.G.Xia, Y.G.Yin, WS.Willis etal J.Catal.185(1999)91]
However, until now, silver catalysts have not worked well for the selective oxidation of carbon monoxide in hydrogen gas

Method used

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  • Catalyst for carbon monoxide oxidation in hydrogen and preparation method thereof
  • Catalyst for carbon monoxide oxidation in hydrogen and preparation method thereof
  • Catalyst for carbon monoxide oxidation in hydrogen and preparation method thereof

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Experimental program
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Embodiment 1

[0026] The silver catalyst supported by active carbon is prepared by equal volume impregnation method, and the silver nitrate of 0.189g is dissolved in 3 milliliters of deionized water according to the total amount ratio of active component and carrier, and 1 gram of active carbon carrier is added thereto, placed at room temperature after stirring Dry at 60° C. for two days to obtain a supported catalyst with a silver loading amount of 12%. After it was treated at 500°C under raw material gas for 2 hours, the active components mainly existed in the form of metallic silver.

Embodiment 2

[0028] The catalyst is prepared by impregnation method using chloroplatinic acid hexahydrate as precursor and carbon black as carrier. Take by weighing 1.048g of an aqueous solution with a platinum concentration of 1.909%, add 6 milliliters of ethanol and 7 milliliters of ionized water, then add 1g of carbon black therein, leave it at room temperature for two days after stirring, and dry at 120°C to obtain the loading capacity of platinum. 2% loaded catalyst. The catalyst was treated with hydrogen at 500°C for 2 hours before the reaction.

Embodiment 3

[0030] According to the weight ratio of silver and platinum, weigh a certain amount of aqueous solution with a platinum concentration of 1.909%, add 1g of carbon black to it, stir and place it at room temperature for two days, dry it at 120°C, and then impregnate 0.094g of silver nitrate aqueous solution , drying at 120°C. The catalyst was treated with hydrogen at 500°C for 2 hours before the reaction. The mass ratio of silver to platinum is 6:2, 1:2, 2:2, 2:3. Bimetallic silver and platinum catalysts can be impregnated in stages, such as first impregnating silver and then impregnating platinum, or first impregnating platinum and then impregnating silver, or co-impregnating. Experiments have confirmed that the catalyst prepared by impregnating platinum first and then silver has good catalytic activity. .

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Abstract

The invention relates to a CO catalyst made of the carrier and the active carbon. The active carbon, carbon black, middle hole carbon, carbon nanometer tube as the carrier, metal platinum, silver and iron in single or compound form to be the active element, with metal weighing 0. 5-25%, silver or iron percentage to platinum being 16:1-16, and platinum: iron: Nickel being 10:1-5:1-5 in weight. It has excellent activity and selectivity, easy for manufacturing, low in cost, unnecessary for extra oxygen, safe in CO and O2 reaction, improved in catalyst energy utilization.

Description

technical field [0001] The invention relates to a catalyst for selective oxidation of carbon monoxide in hydrogen, in particular to a catalyst for selective oxidation of carbon monoxide in hydrogen at low temperature and a preparation method thereof. Background technique [0002] In recent years, hydrogen-fueled fuel cells (PEMFCs) have been widely researched and applied because of their light weight, small size, no secondary pollutants, and high energy utilization at low temperatures. It is increasingly considered as an ideal energy source for motor vehicles and small factories in the future. In order to avoid storing high-pressure hydrogen on the car, the hydrogen used to produce energy mainly comes from methanol and hydrocarbons; fuel cells need platinum electrode catalysts to catalyze low-temperature hydrogen oxidation and oxygen reduction, but platinum electrodes are very slow at lower temperatures It is easily poisoned by a small amount of incomplete combustion produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/38B01J23/745B01J32/00B01J37/02C01B3/50
Inventor 包信和陈礼敏马丁
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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