Temperature Programmed Decomposition of NO over Er2O3/Bi2O3 Catalysts

Chem. J. Chinese Universities ›› 1998, Vol. 19 ›› Issue (6): 961.

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Temperature Programmed Decomposition of NO over Er₂O₃/Bi₂O₃ Catalysts

ZHANG Wei-De¹, LI Ji-Tao¹, GU Ping-Ying¹, WAN Hui-Lin¹, AU Chak-Tong²

1. Department of Chemistry, State Key Laboratory for Physical Chemistry of Solid Surface and Institute of Physical Chemistry, Xiamen University, Xiamen, 361005;
2. Department of Chemistry, Hong Kong Baptist University, Kowloon, Hong Kong

Received:1997-12-30 Online:1998-06-24 Published:1998-06-24

Abstract

Abstract: The face centered cubic(fcc) phases of n (Er₂O₃)/ n (Bi₂O₃)=5%～40%, molar fraction) which is an oxygen ion conductor were prepared. The decomposition of NOover these Er₂O₃/Bi₂O₃ catalysts was examined by means of temperature programmed surface reaction. The results showed that the surface adsorbed NO decomposed to N₂ and O₂ at ca. 600 ℃. The plot of NO conversion and Er composition showed that there was an optimum decomposition rate at ca. 23%(molar fraction). Comparing to the data of conductivity, one can conclude that the rate of NO decomposition increases with the increase in the number of oxygen vacancies. This has been contributed to the similar electronic structure between O₂ and NO.

Key words: NO, Er₂O₃/Bi₂O₃ catalyst, Temperature programmed surface decomposition

CLC Number:

O643.1

TrendMD:

ZHANG Wei-De, LI Ji-Tao, GU Ping-Ying, WAN Hui-Lin, AU Chak-Tong. Temperature Programmed Decomposition of NO over Er₂O₃/Bi₂O₃ Catalysts[J]. Chem. J. Chinese Universities, 1998, 19(6): 961.

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Temperature Programmed Decomposition of NO over Er₂O₃/Bi₂O₃ Catalysts

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