Reforming of n-hexane over Pt-tin silicalite-1

Mal, N. K. ; Sasidharan, M. ; Matsukata, M. ; Sivasanker, S. ; Ramaswamy, A. V. (2004) Reforming of n-hexane over Pt-tin silicalite-1 Studies in Surface Science and Catalysis, 154 (3). pp. 2403-2410. ISSN 0167-2991

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The catalytic behavior of Pt supported on non-acidic silicalite-1 (MFI structure) and on the stannosilicate, Sn-sil-1 molecular sieves in the aromatization of n-hexane is investigated. The influence of Pt content, temperature, space velocity, H2/n-hexane ratio and time on stream (TOS) on the n-hexane conversion, aromatic selectivity and aromatic yield are presented. Aromatics are the main products and this suggests that the aromatization proceeds via dehydrocyclization and/or hydrogenolysis, dehydrogenation to C2-C4 olefins followed by oligomerization inside the pores of the molecular sieve into cyclic intermediates in presence of hydrogen. The incorporation of Pt during the synthesis of the stannosilicate (Sn-sil-1) yields a more active catalyst (42 wt% aromatic selectivity) without any deactivation than when Pt is loaded by impregnation on Sn-sil-1 because catalyst deactivation associate with platinum outside the zeolite pores. A formation mechanism is proposed.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Microporous; Tin-silicate; Reforming of n-hexane; Pt-containing Molecular Sieves
ID Code:47692
Deposited On:12 Jul 2011 14:44
Last Modified:12 Jul 2011 14:44

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