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• W2034772796 abstract "Surface sites on a series of dealuminated zeolitic catalysts of the H-ZSM-5 and mordenite types have been investigated using Fourier-transform-infrared spectroscopy (FT-ir). Three types of H-ZSM-5 surface site have been considered in detail: dealumination-associated Brønsted-silanol sites, aluminum-associated Brønsted-silanol sites, and Lewis sites. Sequences of populations of these sites have been identified using three methods: silanol stretching mode absorbance changes, relative changes in absorbance of adsorbed pyridine modes, and analytical data from X-ray fluorescence (XRF) characterizing the extracted surface layer. In the case of the method based on adsorbed pyridine a novel treatment has been developed which permits Brønsted (B)/Lewis(L) site ratios to be calculated as a function of temperature. This method reveals that the [B][L] ratio exhibits a maximum at ca. 473 K which is associated with the dealumination Brønsted sites. Comparison of sequences of site populations with observed reactivities suggests that Lewis sites are the origin of catalytic activity in the conversion of CH3OH to (CH3)2O. Similar comparisons indicate that dealumination Brønsted sites are the principal source of reactivity for the conversion of (CH3)2O to hydrocarbons. The migration of aluminum atoms away from the surfaces of ZSM-5 during calcination is invoked to explain the resistance of precalcined catalysts to acid dealumination." @default.
• W2034772796 created "2016-06-24" @default.
• W2034772796 creator A5028312425 @default.
• W2034772796 date "1984-07-01" @default.
• W2034772796 modified "2023-09-30" @default.
• W2034772796 title "A Fourier-transform infrared spectral study of H-ZSM-5 surface sites and reactivity sequences in methanol conversion" @default.
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• W2034772796 doi "https://doi.org/10.1016/0021-9517(84)90059-9" @default.
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