Acidity properties of CHA-zeolites (SAPO-34 and SSZ-13): an FTIR spectroscopic study
作者： Laura Regli , Silvia Bordiga , Adriano Zecchina , Morten Bjergen , Karl Petter Lillerud
DOI: 10.1016/S0167-2991(05)80174-0
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摘要: Abstract Zeolite structures based on the chabazite topology, such as H-SAPO-34, possess unique shape-selectivity properties for converting methanol into light olefins. In addition to zeolite acidity is inherently linked catalyst activity and selectivity. The acidic of high silica Chabazite (H-SSZ-13) have attracted much attention last decade conclusions drawn so far essentially been founded quantum chemical methods. An experimental benchmark H-SSZ-13 has hitherto not available. this work, transmission FTIR spectroscopy provides a description different sites H-SAPO-34 by using water probe molecules compare results with those obtained zolitic homologue: H-SSZ-13. demonstrate that both materials are strongly acidic, having two distinct sets Bronsted show accessibility. However all interact bases forming strong H-bonded adducts; moreover, in presence or loadings, clear evidences protonation found only case
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