Modified Co-Ce core-shell structure catalyst for carbon monoxide (CO) low-temperature oxidation

A carbon monoxide, core-shell structure technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, air quality improvement, etc., can solve the problem of large mass transfer diffusion resistance and low porosity mass transfer diffusion and adsorption activation to achieve the effect of increasing the contact interface, improving the oxygen transfer capacity, and increasing the porosity

Inactive Publication Date: 2015-12-16
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is, for the existing core-shell structure Co 3 o 4 CeO 2 In the low-temperature oxidation reaction of CO, the reactant gas molecules CO and O 2 The shell structure of CeO 2 On the problem of large mass transfer diffusion resistance, and Co 3 o 4 The low porosity of the core structure has adverse effects on the mass transfer diffusion and adsorption activation of the reactants. The present invention prepares the core-shell structure material Co by self-assembly method 3 o 4 CeO 2 , modified by formic acid treatment to prepare a core-shell structure catalyst with high specific surface area, large contact interface, and high porosity, which effectively improves the mass transfer, diffusion, and adsorption and activation capabilities of the reactants. At the same time, the CeO 2 Oxygen storage capacity and oxygen transfer capacity, thus improving its CO low-temperature oxidation activity

Method used

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  • Modified Co-Ce core-shell structure catalyst for carbon monoxide (CO) low-temperature oxidation
  • Modified Co-Ce core-shell structure catalyst for carbon monoxide (CO) low-temperature oxidation

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Embodiment 1

[0026] Weigh 14.50 g of Co(NO 3 ) 2 .6H 2 O and 26.90 g CO(NH 2 ) 2 , add 50 ml of deionized water and mix to form a solution, place it in a constant temperature water bath at 70°C for 30 minutes under magnetic stirring, then transfer it to a hydrothermal reaction kettle, keep it at 180°C for 12 hours, take it out, filter and wash; transfer the obtained filter cake to into a mixture of 25ml of water and 25ml of ethanol, and stirred to obtain suspension #1. Weigh 5.72 grams of Ce(NO 3 ) 3 .9H 2 O, dissolved in 13 ml of deionized water to form solution #2; slowly drop solution #2 into suspension #1 and form a homogeneous mixture under stirring, then add 0.96 g of CTAB and ultrasonically stir in a 70°C water bath 12h to form a core-shell structure precursor. After filtering and washing the obtained precursor, weigh 4 grams, transfer to 50ml of 0.5mol / L formic acid solution, stir at room temperature for 30min, then filter, wash, dry at 105°C for 12h, and roast at 500°C Af...

Embodiment 2

[0029] Weigh 14.50 g of Co(NO 3 ) 2 .6H 2 O and 26.90 g CO(NH 2 ) 2 , add 50 ml of deionized water and mix to form a solution, place it in a constant temperature water bath at 70°C for 30 minutes under magnetic stirring, then transfer it to a hydrothermal reaction kettle, keep it at 180°C for 12 hours, take it out, filter and wash; transfer the obtained filter cake to into a mixture of 25ml of water and 25ml of ethanol, and stirred to obtain suspension #1. Weigh 5.72 grams of Ce(NO 3 ) 3 .9H 2 O, dissolved in 13 mL of deionized water to form solution #2. Slowly drop solution #2 into suspension #1, and form a homogeneous mixture under stirring, then add 0.96 g of CTAB, and ultrasonically stir for 12 h in a water bath at 70°C to form a core-shell structure precursor. After filtering and washing the obtained precursor, weigh 4 grams, transfer to 50ml of 1.0mol / L formic acid solution, stir at room temperature for 30min, then filter, wash, dry at 105°C for 12h, and roast at...

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Abstract

The invention relates to a modified Co-Ce core-shell structure catalyst for carbon monoxide (CO) low-temperature oxidation, and aims to solve the problems that when the conventional core-shell structure Co3O4-CeO2 catalyst is utilized for a CO low-temperature oxidation reaction, the porosity rate of a Co3O4 core material is relatively low, an adverse effect is caused on CO and O2 mass transfer diffusion to a reactant, and the mass transfer diffusion resistance of the conventional core-shell structure is relatively high. The modified Co-Ce core-shell structure catalyst being large in specific surface area, high in porosity rate and large in contact interface is obtained by preparing a core-shell structure material Co3O4-CeO2 through self-assembly and carrying out modification through formic acid treatment; through adoption of the modified Co-Ce core-shell structure catalyst, the capabilities of mass transfer diffusion to the reactant and adsorption-activation are effectively improved; through utilization of the oxygen storage and transfer capabilities of CeO2, the activity of the CO low-temperature oxidation reaction is effectively improved. The modified Co-Ce core-shell structure catalyst comprises 35-55wt% of Co3O4 and 45-65wt% of CeO2.

Description

technical field [0001] The present invention relates to a modified cobalt-cerium core-shell structure catalyst for low-temperature oxidation of carbon monoxide, more specifically, to a self-assembled cobalt-cerium oxide and a core-shell structure catalyst modified by formic acid, The invention belongs to the technical field of low-temperature oxidation of carbon monoxide. Background technique [0002] Carbon monoxide (CO) is a common flammable gas. In fuel cell research, starting from low-carbon alcohols and hydrocarbon raw materials, the hydrogen-rich feed gas obtained through partial oxidation or steam reforming often contains about 0.5-3% (mol) of CO, which will not only cause fuel The battery electrode is poisoned, and it will also interact with H 2 The reaction between competition and oxygen leads to a significant reduction in the efficiency of fuel cells, and CO must be selectively eliminated; on the other hand, motor vehicle exhaust emissions and incomplete combusti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J35/02B01D53/86B01D53/62
CPCY02A50/20
Inventor 黄利宏尚锐淑段义平钟心燕谢伟周庆杨浩牛飞兴
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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