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Dealuminated ZSM-5 zeolite catalyst for ethylene oligomerization to liquid fuels

Saidina Amin, Nor Aishah and Anggoro, Didi Dwi (2002) Dealuminated ZSM-5 zeolite catalyst for ethylene oligomerization to liquid fuels. Journal of Natural Gas Chemistry , 11 (1-2). pp. 79-86. ISSN 1003-9953

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Abstract

Ethylene oligomerization using ZSM-5 zeolite was investigated to study the role of Bronsted acid sites in the formation of higher hydrocarbons. The oligomerization of olefins, dependent on the acidity of ZSM-5 zeolite, is an important step in the conversion of natural gas to liquid fuels. The framework Si/Al ratio reflects the number of potential acid sites and the acid strength of the ZSM-5 catalyst. ZSM-5 with the mole ratio SiO2/Al2O3 equal to 30 was dealuminated for different periods of time according to the acidic ion-exchange method to produce ZSM-5 with various Si/Al ratios. The FT-IR analysis revealed that the integrated framework aluminum band, non-framework aluminum band, and silanol groups areas of the ZSM-5 zeolites decreased after being dealuminated. The performance of dealuminated zeolite was tested for ethylene oligomerization. The result demonstrated that the dealumination of ZSM-5 led to higher ethylene conversion, but the gasoline selectivity was reduced compared to the performance of a ZSM-5 zeolite. The characterization results revealed that the amount of aluminum in the zeolitic framework, the crystallinity of the ZSM-5 zeolite and the Si/Al ratio affected the formation of Bronsted acid sites. The number of the Bronsted acid sites on the catalyst active sites is important in the olefin conversion to liquid hydrocarbons.

Item Type:Article
Uncontrolled Keywords:Dealumination, ethylene, liquid fuels, oligomerization, ZSM-5
Subjects:T Technology > T Technology (General)
Divisions:Chemical and Natural Resources Engineering (Formerly known)
ID Code:4662
Deposited By: Norhani Jusoh
Deposited On:17 Dec 2007 03:02
Last Modified:01 Jun 2010 03:19

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