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The High Dispersion of CuCl2 in ZSM-5 by Using Microwave Method

Published online by Cambridge University Press:  15 February 2011

Feng-Shou Xiao ,
Wenguo Xu ,
Shilun Qru  and
Ruren Xu
Feng-Shou Xiao
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China
Wenguo Xu
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China
Shilun Qru
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China
Ruren Xu
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023, People's Republic of China
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Abstract

Three preparation methods of ZSM-5 supported copper were studied. The first sample is the mechanical mixture of CuCl2·2H2O with NaZSM-5 (Cu+ZSM-5), the second sample is the mechanical mixture of CuCl2·2H2O with NaZSM-5 followed by microwave treatment (Cu/ZSM-5), and the third sample is copper ion exchanged with NaZSM-5 (CuZSM-5). All the samples were characterized by XRD, DTA, and n-hexane adsorption. Cu+ZSM-5 samples showed characteristic XRD peaks of both NaZSM-5 and CuCl2·2H2O and Cu/ZSM-5 samples showed only NaZSM-5 XRD peaks; these results suggest that CuCl2·2H2O no longer exists in the crystalline state in Cu/ZSM-5 samples, possibly in a highly dispersed state. DTA experiments showed that Cu+ZSM-5 samples did exhibit the melting point of CuCl2 and Cu/ZSM-5 did not. Furthermore, as compared with Cu+ZSM-5 and CuZSM-5, the n-hexane adsorption on Cu/ZSM-5 samples require higher n-hexane pressure to reach the saturated adsorption; these results suggest that the copper salt has entered the zeolite channels during microwave treatment, resulting in the change of channel circumstance for ZSM-5 zeolite. All these results suggest that microwave technique is a potential method for preparing highly dispersed metal salts in the channels or cages of zeolites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 344: Symposium I – Materials and Processes for Environmental Protection , 1994 , 139
Copyright
Copyright © Materials Research Society 1994

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