Citation: WANG Yong-zhao, FAN Li-yuan, WU Rui-fang, SHI Jing, LI Xiao, ZHAO Yong-xiang. Effect of ammonia concentration on the catalytic activity of Pd-Cu supported on attapulgite clay prepared by ammonia evaporation in CO oxidation at room temperature[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(9): 1076-1082. shu

Effect of ammonia concentration on the catalytic activity of Pd-Cu supported on attapulgite clay prepared by ammonia evaporation in CO oxidation at room temperature

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School of Chemistry and Chemical Engineering, Engineering Research Center for Fine Chemicals of Ministry of Education, Shanxi University, Taiyuan 030006, China

Corresponding author: WANG Yong-zhao, ZHAO Yong-xiang,
Received Date: 15 February 2015
Available Online: 1 June 2015
Fund Project: 国家自然科学基金(21073114) (21073114) 国际合作项目(2013DFA40460) (2013DFA40460) 山西省科技创新重点团队项目(2012021007)。 (2012021007)

With attapulgite clay (APT) as support, the Pd-Cu/APT catalysts were prepared by an ammonia evaporation method and characterized by N₂-physisorption, XRD, FT-IR, TEM and H₂-TPR. The effect of ammonia concentration on the catalytic performance of Pd-Cu/APT in CO oxidation at room temperature was investigated in a fixed-bed continuous flow microreactor. The results showed that CuO appears as the main Cu species in the Pd-Cu/APT catalysts prepared with over low or over high ammonia concentration, whereas the quantity of Cu₂(OH)₃Cl phase is much less. However, a proper concentration of ammonia is of benefits to forming stable Cu₂(OH)₃Cl species in Pd-Cu/APT; owing to its high dispersion, nano-platelet morphology and strong interaction with Pd species, the presence of stable Cu₂(OH)₃Cl can significantly promote the catalytic performance of Pd-Cu/APT in CO oxidation. Under a gas hourly space velocity (GHSV) of 6 000 h^-1 for a feed stream containing 1.5% CO and 3.3% water, the Pd-Cu/APT catalyst exhibits excellent activity and stability in CO oxidation even at room temperature.
- Pd-Cu/APT,
- attapulgite clay,
- ammonia evaporation,
- ammonia concentration,
- room-temperature CO oxidation
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