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Citation: 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[J]. Acta Physico-Chimica Sinica, ;1994, 10(07): 628-634. doi: 10.3866/PKU.WHXB19940710 shu

Formation and Characterization of Ga Active Site in GaZSM-5 Zeolite

1.
Department of Chemistry, Peking University, Beijing 100871

Received Date: 9 March 1993
Available Online: 15 July 1994

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.
- GaZSM-5 zeolite,
- C₃H₈ aromatization,
- IR spectra of pyridine adsorption
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