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Acta Physico-Chimica Sinica  1994, Vol. 10 Issue (07): 628-634    DOI: 10.3866/PKU.WHXB19940710
Article     
Formation and Characterization of Ga Active Site in GaZSM-5 Zeolite
She Li-Qin, Zhu Gao-Zhong, Wen Rui-Wu, Zhang Chang-Jun,  Li Xuan-Wen, Liu Xing-Yun
Department of Chemistry, Peking University, Beijing 100871
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Abstract  

The process of the formation of the Ga active site in GaZSM-5 zeolite (prepared by impregnation) and the enhancement of the aromatization activity following successive increasing extent of reduction of Ga species were observed by the IR spectra of pyridme adsorption and pulse microreaction system respectively. The results show that absorbance of the band near 1458 cm~(-1) can be correlated with the aromatization activity and Ga content of GaZSM-5 zeolite, so it can be assigned to a pyridine complex with Ga active site. The effect of SiO_2/Al_2O_3 ratio on the formation of Ga active site was also studied. It was found that the sample with lower SiO_2/Al_2O_3 ratio could form more Ga active sites. After measuring the aromatzation activity by pulse microreaction and determining the valence state of Ga sites by TPR, the authors suggest that both the high and the low valence Ga active sites can play the role of the active sites in C_3H_8 aromatization.



Key wordsGaZSM-5 zeolite      C3H8 aromatization      IR spectra of pyridine adsorption     
Received: 09 March 1993      Published: 15 July 1994
Corresponding Authors: She Li-Qin   
Cite this article:

She Li-Qin, Zhu Gao-Zhong, Wen Rui-Wu, Zhang Chang-Jun, Li Xuan-Wen, Liu Xing-Yun. Formation and Characterization of Ga Active Site in GaZSM-5 Zeolite. Acta Physico-Chimica Sinica, 1994, 10(07): 628-634.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB19940710     OR     http://www.whxb.pku.edu.cn/Y1994/V10/I07/628

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