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Acid properties of zeolites ZSM-5 desilicated in pure NaOH and in mixtures of NaOH/tetrabutylamine hydroxide (TBAOH) of various concentrations of basic solutions as well as of different proportions between NaOH and TBAOH were investigated. IR studies of pyridine sorption informed on the concentration of both Brønsted and Lewis acid sites and on the acid strength of SiOHAl groups. The nature of Lewis...
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