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

WANG Yong-zhao; FAN Li-yuan; WU Rui-fang; SHI Jing; LI Xiao; ZHAO Yong-xiang

Volume 43 Issue 09

Sep. 2015

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Article Navigation > Journal of Fuel Chemistry and Technology > 2015 > 43(09): 1076-1082

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(09): 1076-1082.

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(09): 1076-1082.

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(09): 1076-1082.

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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

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

Received Date: 2015-02-15
Rev Recd Date: 2015-06-01
Publish Date: 2015-09-30

Abstract

Abstract

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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References(24)

References

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