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Effect of iridium loading on HZSM-5 for isomerization of n-heptane

Setiabudi, H. D. and Triwahyono, Sugeng and Abdul Jalil, Aishah and Kamarudin, N. H. N. and Aziz, M. A. A. (2011) Effect of iridium loading on HZSM-5 for isomerization of n-heptane. Journal of Natural Gas Chemistry, 20 (5). pp. 477-482. ISSN 1003-9953

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Official URL: http://dx.doi.org/10.1016/S1003-9953(10)60227-7

Abstract

The effect of iridium loading on the properties and catalytic isomerization of n-heptane over Ir-HZSM-5 is studied. Ir-HZSM-5 was prepared by impregnation method and subjected to isomerization process in the presence of flowing hydrogen gas. XRD and BET studies show that the presence of iridium stabilizes the crystalline structure of HZSM-5, leading to more ordered framework structure and larger surface area. TGA and FTIR results substantiate that iridium species interacts with OH group on the surface of HZSM-5. Pyridine FT-IR study verifies the interaction between iridium and surface OH group slightly increased the Brönsted and Lewis acid sites without changing the lattice structure of HZSM-5. The presence of iridium and the increase of strong Lewis acid sites on HZSM-5 were found to bring an increase about 4.1, 33.2 and 11.8 in conversion, selectivity and yield of n-heptane isomerization, respectively.

Item Type:Article
Uncontrolled Keywords:Ir-HZSM-5, lewis acid sites, n-heptane isomerization, protonic acid sites
Subjects:Q Science
Divisions:Science
ID Code:28987
Deposited By: Liza Porijo
Deposited On:07 Dec 2012 00:32
Last Modified:07 Dec 2012 00:32

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