Surface Acidic and Catalytic Properties of H(M=Al, Ga, Fe)ZSM-5 Zeolite

Abstract

Abstract: The surface acidities and catalytic activities of some trivalent heteroatom-containing H(M)ZSM-5 (M=A1, Ga, Fe) zeolite have been studied by means of TPD, IRand cracking of n-pentadecane.The results indicate that Bronsted and Lewis acidic sites are present in these zeolites but the C_L/C_B on the surfaces of H(Ga)ZSM-5 and H(Fe)ZSM-5 are more higher than that on the surface of H(Aj)ZSM-5. Besides, there exist in the order of the acidic strength H(Al)ZSM-5>H(Ga)ZSM-5>H(Fe)ZSM-5. Cracking activities have been found to be dependent on the heteroatom in the framework of the zeolite. The normalized activity and the selectivity of gas-oil increase in the order as H(Ga)ZSM-5>H(Al)ZSM-5>H(Fe)ZSM-5. These results suggest that the Lewis acidic site play an important part in the cracking of n-pentadecane.

Key words: Heteroatom zeolites, Surface acid, Cracking

TrendMD:

Jiang Dazhen, Xiao Fengshou, Liu Ziyang, Xu Ruren . Surface Acidic and Catalytic Properties of H(M=Al, Ga, Fe)ZSM-5 Zeolite[J]. Chem. J. Chinese Universities, 1988, 9(5): 475.

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Surface Acidic and Catalytic Properties of H(M=Al, Ga, Fe)ZSM-5 Zeolite

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