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THE USE OF THE COMBINATION OF FTIR, PYRIDINE ADSORPTION, 27Al AND 29Si MAS NMR TO DETERMINE THE BRÖNSTED AND LEWIS ACIDIC SITES. JT [Internet]. 2016 May 30 [cited 2024 Jul. 18];78(6). Available from: https://journals.utm.my/jurnalteknologi/article/view/8821