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Acta Physico-Chimica Sinica  1995, Vol. 11 Issue (08): 724-729    DOI: 10.3866/PKU.WHXB19950811
Article     
The Study of Propane Aromatization over ZnHZSM-5:Activation of Propane
Cheng Mo-Jie,Wang Jiang-Mai,Yang Ya-Shu,Li Can
State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Academic Sinica,Dalian 116023
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Abstract  

The IR spectra of hydroxyl and probe molecule CO and the aromatization of propane were investigated over HZSM-5, ZnHZSM-5 and ZnNaHZSM-5.The IR spectra showed that the relative band intensity of strong acidic hydroxyl groups at 3610cm-1 decreased by Zn2+ ion exchange and sodium hydroxide impregnatin, which indicated that Zn2+ and Na+ cations had occupied the cation centers in the zeolite. The band appearing at 2232cm-1 in CO IR spectra demonstrated that Zn2+ cations were a sort of strong lewis acid. The greatly improvement of propane conversion and aromatics selectivity after Zn2+ incorporation into HZSM-5, the decreasing of propane conversion and the increasing of propane selectivity and yield from sodium hydroxide impregnation depicted that zinc species directly participate in propane dehydrogenation. In conclusion, zinc lewis acid sites are the activation centers for propane dehydrogenation, on which propane could be hetero-cracking activated and directly dehydrogenated.



Key wordsZnHZSM-5      Propane;Aromatization      Dehydrogenation      Activation     
Received: 11 June 1994      Published: 15 August 1995
Corresponding Authors: Cheng Mo-Jie   
Cite this article:

Cheng Mo-Jie,Wang Jiang-Mai,Yang Ya-Shu,Li Can. The Study of Propane Aromatization over ZnHZSM-5:Activation of Propane. Acta Physico-Chimica Sinica, 1995, 11(08): 724-729.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB19950811     OR     http://www.whxb.pku.edu.cn/Y1995/V11/I08/724

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