Promotion effect of adsorbed water/OH on the catalytic performance of Ag/activated carbon catalysts for CO preferential oxidation in excess H2

能源化学(英文) ›› 2013, Vol. 22 ›› Issue (4): 591-598.

Promotion effect of adsorbed water/OH on the catalytic performance of Ag/activated carbon catalysts for CO preferential oxidation in excess H₂

Yuanyuan Guo^a, Limin Chen^a,b, Ding Ma^b,c, Daiqi Ye^a, Bichun Huang^a

a. Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, Guangdong, China;
b. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
c. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

收稿日期:2012-10-13 修回日期:2012-11-27 出版日期:2013-07-20 发布日期:2013-07-27
通讯作者: Limin Chen
基金资助:
This work was supported by the National Natural Science Foundation of China (No. 21207039), the Natural Science Foundation of Guangdong Province, China (Grant No. S2011010000737), the Doctoral Fund of Ministry of Education of China (20110172120017), the Fundamental Research Funds for the Central Universities (Grant No. 2011zm 0048), and the Key Laboratory of Renewable Energy and Gas Hydrate, Chinese Academy of Sciences (No. Y007K1).

Promotion effect of adsorbed water/OH on the catalytic performance of Ag/activated carbon catalysts for CO preferential oxidation in excess H₂

Yuanyuan Guo^a, Limin Chen^a,b, Ding Ma^b,c, Daiqi Ye^a, Bichun Huang^a

a. Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, Guangdong, China;
b. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
c. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Received:2012-10-13 Revised:2012-11-27 Online:2013-07-20 Published:2013-07-27
Supported by:
This work was supported by the National Natural Science Foundation of China (No. 21207039), the Natural Science Foundation of Guangdong Province, China (Grant No. S2011010000737), the Doctoral Fund of Ministry of Education of China (20110172120017), the Fundamental Research Funds for the Central Universities (Grant No. 2011zm 0048), and the Key Laboratory of Renewable Energy and Gas Hydrate, Chinese Academy of Sciences (No. Y007K1).

摘要/Abstract

摘要： Activated carbon (AC) supported silver catalysts were prepared by incipient wetness impregnation method and their catalytic performance for CO preferential oxidation (PROX) in excess H₂ was evaluated. Ag/AC catalysts, after reduction in H₂ at low temperatures (≤200 ℃) following heat treatment in He at 200 ℃ (He200H200), exhibited the best catalytic properties. Temperature-programmed desorption (TPD), X-ray diffraction (XRD) and temperature-programmed reduction (TPR) results indicated that silver oxides were produced during heat treatment in He at 200 ℃ which were reduced to metal silver nanoparticles in H₂ at low temperatures (≤200 ℃), simultaneously generating the adsorbed water/OH. CO conversion was enhanced 40% after water treatment following heat treatment in He at 600 ℃. These results imply that the metal silver nanoparticles are the active species and the adsorbed water/OH has noticeable promotion effects on CO oxidation. However, the promotion effect is still limited compared to gold catalysts under the similar conditions, which may be the reason of low selectivity to CO oxidation in PROX over silver catalysts. The reported Ag/AC-S-He catalyst after He200H200 treatment displayed similar PROX of CO reaction properties to Ag/SiO₂. This means that Ag/AC catalyst is also an efficient low-temperature CO oxidation catalyst.

关键词: promotion effect, adsorbed water/OH, Ag/activated carbon (Ag/AC) catalysts, CO preferential oxidation (PROX)

Abstract: Activated carbon (AC) supported silver catalysts were prepared by incipient wetness impregnation method and their catalytic performance for CO preferential oxidation (PROX) in excess H₂ was evaluated. Ag/AC catalysts, after reduction in H₂ at low temperatures (≤200 ℃) following heat treatment in He at 200 ℃ (He200H200), exhibited the best catalytic properties. Temperature-programmed desorption (TPD), X-ray diffraction (XRD) and temperature-programmed reduction (TPR) results indicated that silver oxides were produced during heat treatment in He at 200 ℃ which were reduced to metal silver nanoparticles in H₂ at low temperatures (≤200 ℃), simultaneously generating the adsorbed water/OH. CO conversion was enhanced 40% after water treatment following heat treatment in He at 600 ℃. These results imply that the metal silver nanoparticles are the active species and the adsorbed water/OH has noticeable promotion effects on CO oxidation. However, the promotion effect is still limited compared to gold catalysts under the similar conditions, which may be the reason of low selectivity to CO oxidation in PROX over silver catalysts. The reported Ag/AC-S-He catalyst after He200H200 treatment displayed similar PROX of CO reaction properties to Ag/SiO₂. This means that Ag/AC catalyst is also an efficient low-temperature CO oxidation catalyst.

Key words: promotion effect, adsorbed water/OH, Ag/activated carbon (Ag/AC) catalysts, CO preferential oxidation (PROX)

Yuanyuan Guo, Limin Chen, Ding Ma, Daiqi Ye, Bichun Huang. Promotion effect of adsorbed water/OH on the catalytic performance of Ag/activated carbon catalysts for CO preferential oxidation in excess H₂[J]. 能源化学(英文), 2013, 22(4): 591-598.

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Promotion effect of adsorbed water/OH on the catalytic performance of Ag/activated carbon catalysts for CO preferential oxidation in excess H₂

Promotion effect of adsorbed water/OH on the catalytic performance of Ag/activated carbon catalysts for CO preferential oxidation in excess H₂

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