Methane dehydro-aromatization over a Mo/phosphoric rare earth-containing penta-sil type zeolite in the absence of oxygen

Authors: Shu Y.; Ma D.; Bao X.; Xu Y.

Source: Catalysis Letters, Volume 66, Number 3, 2000 , pp. 161-167(7)

Publisher: Springer

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Abstract:

The dehydro-aromatization of methane over a Mo-modified penta-sil type high-silica zeolite containing phosphoric and rare earth oxide (abbreviated as Mo/HZRP-1) was investigated. As a modification of HZSM-5, HZRP-1 is also a good support for the preparation of Mo-based zeolite catalysts, and is active for methane dehydro-aromatization. Mo/HZRP-1 catalysts are more active at high Mo loadings compared with Mo/HZSM-5 catalysts. ^{27}Al MAS NMR spectra of Mo/HZRP-1 reveal that there are two kinds of framework Al in HZRP-1. It is suggested that only the tetrahedral coordinated Al atoms in the form of Al–O–Si species in the zeolite, in the proton forms, are responsible for the formation of aromatics.

Keywords: methane dehydro-aromatization; Mo/HZRP-1 catalyst; NH-TPD; Al MAS NMR

Language: English

Document Type: Regular paper

Affiliations: 1: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, PO Box 110, Dalian 116023, PR China E-mail: xuyd@ms.dicp.ac.cn

Publication date: 2000-01-01