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

Malik Musthofa | Zendy; Ainul Hakimah Karim | Zendy; Nurrulhidayah Ahmad Fadzlillaah | Zendy; N.H.R. Annuar | Zendy; Aishah Abdul Jalil | Zendy; S. Triwahyono | Zendy

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

Author(s) -

Malik Musthofa,

Ainul Hakimah Karim,

Nurrulhidayah Ahmad Fadzlillaah,

N.H.R. Annuar,

Aishah Abdul Jalil,

S. Triwahyono

Publication year - 2014

Publication title -

malaysian journal of fundamental and applied sciences

Language(s) - English

Resource type - Journals

ISSN - 2289-599X

DOI - 10.11113/mjfas.v6n2.195

Subject(s) - pyridine , nitrogen , chemistry , catalysis , brønsted–lowry acid–base theory , lewis acids and bases , liquid nitrogen , nitrogen gas , analytical chemistry (journal) , chromatography , organic chemistry

Gas flow-injection technique pyridine-FTIR was studied for determination of Lewis and Bronsted 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.

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