Initial activity/selectivity of H-Gallosilicate (MFI) in propane aromatization: influence of H+ exchange and thermal/hydrothermal pretreatments

Choudhary, V. R. ; Kinage, A. K. ; Sivadinarayana, C. ; Sansare, S. D. ; Guisnet, M. (1995) Initial activity/selectivity of H-Gallosilicate (MFI) in propane aromatization: influence of H+ exchange and thermal/hydrothermal pretreatments Catalysis Letters, 33 (3-4). pp. 401-412. ISSN 1011-372X

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Official URL: http://www.springerlink.com/content/l7j76223w34776...

Related URL: http://dx.doi.org/10.1007/BF00814242

Abstract

Initial activity/selectivity of H-gallosilicate (MFI) zeolite with different degrees of H+ exchange and pretreated under different thermal and hydrothermal conditions in propane aromatization (at 500≠ C) has been determined using a pulse microreactor connected to GC. It is found to be strongly influenced by the degree of H+ exchange, calcination temperature and hydrothermal treatment at different temperatures and concentrations of steam. There exists a close relationship between the acidity (measured in terms of pyridine chemisorbed at 400≠C) of the gallosilicate and its initial propane conversion and aromatization activity. Presence of strong acidic sites (attributed to FW Ga) at high concentration is essential for the well dispersed non-FW Ga oxide species to be active for dehydrogenation in the propane aromatization over the zeolite.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
Keywords:H-gallosilicate (MFI) Zeolite; Propane Aromatization; Acidity of Zeolite; H+ Exchange of GaMFI; Thermal Pretreatments to H-GaMFI; Hydrothermal Treatments to H-GaMFI
ID Code:10486
Deposited On:03 Nov 2010 11:45
Last Modified:30 May 2011 04:38

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