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Determination of Lewis and Brönsted acid sites by gas flow-injection technique

Musthofa, M. and Karim, A. H. and Fadzlillaah, N. A. and Annuar, N. H. R. and Jalil, A. and Triwahyono, S. (2010) Determination of Lewis and Brönsted acid sites by gas flow-injection technique. Journal of Fundamental Science, 6 (2). pp. 127-131. ISSN 1823-626X

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Abstract

Gas flow-injection technique pyridine-FTIR was studied for determination of Lewis and Brönsted acid sites on the solid super acid catalysts. The system consists of stainless steel gas cell which can be heated up to 623 K, CaF2 windows, pyridine injection port and double liquid nitrogen trap for removal of moisture. Pure nitrogen gas and pyridine were used as a carrier and probe molecule. Pyridine was injected to the sysem at 423 K followed by flushing of N2 gas through double liquid nitrogen trap at 423 for 1 h and at 573 K for 30 min. All spectra were recorded at room temperature. This technique gave similar results to those of taken by vacuum system for HZSM-5, Pt/SO4 2--ZrO2, Al2O3 catalysts.

Item Type:Article
Uncontrolled Keywords:gas flow, pyridine, lewis acid sites, bronsted acid sites, HZSM-5, Pt/SO42--ZrO2, AI2O3
Subjects:Q Science > QD Chemistry
ID Code:25907
Deposited By: Liza Porijo
Deposited On:15 Jun 2012 08:56
Last Modified:27 Mar 2014 16:23

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