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KMID : 1059519890330020177
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Journal of the Korean Chemical Society
1989 Volume.33 No. 2 p.177 ~ p.184
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Acidic Properties of ZSM-5 Zeolite Catalyst
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Ahn Byoung-Joon
Park Joon-Ryeo
Chon Hak-Ze
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Abstract
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Acidic properties of ZSM-5 zeolite catalysts were investigated by temperature-programmed desorption technique and ir spectroscopy. Ammonia t.p.d. pattern of HZSM-5 showed three different states, designated as α,β and γ. The amount of γ-state decreased with increasing SiO2/Al2O3 ratio, and upon cation-exchanging with alkali cations. From the ir adsorption spectra of absorbed pyridine and the reaction study of toluene alkylation, the γ-state could be explained to be due to the strong Bronsted acid sites of H-ZSM-5. Also they showed that the interaction between alkali cation-exchanged ZSM-5 and bases, i.e. NH3 and pyridine, was increasing with decreasing the size of cations.
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