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Hydrogen spillover behavior of Zn/HZSM-5 showing catalytically active protonic acid sites in the isomerization of n-pentane

Triwahyono, Sugeng and Abdul Jalil, Aishah and Mukti, Rino R. and Musthofa, Malik and M. Razali, N. Aini and A. Aziz, M. Arif (2011) Hydrogen spillover behavior of Zn/HZSM-5 showing catalytically active protonic acid sites in the isomerization of n-pentane. Applied Catalysis A: General, 407 . pp. 91-99. ISSN 0926-860X

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Abstract

The impregnation of zinc particles into MFI zeolite (HZSM-5) caused the formation of catalytically active protonic acid sites for isomerizing n-pentane in the presence of hydrogen. An infrared (IR) study with preadsorbed pyridine revealed that these protonic acid sites originated from the spillover of molecular hydrogen from the zinc species onto the zeolite surface. The requirements for this spillover effect were further studied by IR spectroscopy of adsorbed ammonia and carbon monoxide. The presence of zinc species in HZSM-5 suggested the exchange of acidic character towards strong Lewis acids rather than Brønsted acid sites. The isomerization of n-pentane over the Zn/HZSM-5 catalyst resulted in high activity and stability and the conversion to iso-pentane depends on the promotive effect of hydrogen as a carrier gas.

Item Type:Article
Uncontrolled Keywords:active protonic acid
Subjects:Q Science > QC Physics
Divisions:Science
ID Code:44968
Deposited By: Haliza Zainal
Deposited On:21 Apr 2015 11:31
Last Modified:19 Sep 2017 15:51

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