Abstract
Alkali-exchanged zeolites have both Lewis acid and Lewis base centres. They provide an easy way to tune up the relative strengths of these two sites by controlling Si/Al ratio and electropositivity of the counter cation. These effects can be monitored both byFTIR and N1s XPS of chemisorbed pyrrole. A systematic study of the relationship between acid-base properties and the reactions of methylbutynol (MBOH) was performed over these alkali-exchanged zeolites. The results show that the Lewis base centres catalyze the cleavage reaction ofMBOH, which produces acetone and acetylene, while the strong Lewis acid centres catalyze the dehydration ofMBOH to 3-methyl-3-buten-1-yne (MBYNE). The strong basicity of alkaliexchangedX zeolites produces almost 100% selectivity to acetone and acetylene, whereas the strong Lewis acidity of alkali-exchangedZSM-5 zeolites results in a high selectivity toMBYNE. Compared with the catalytic results overH-ZSM-5 zeolites, it is further concluded that the catalytic conversion ofMBOH to 3-methyl-3-butene-2-one (MIPK) requires the presence of not Lewis acid but strong Brønsted acid sites. The reactions ofMBOH over acid-base catalysts are considered as standard reactions for the characterization of acid and base centres. A correlation between these reactions and theFTIR, andXPS of pyrrole data will be discussed. The deactivation mechanism duringMBOH conversion over alkali-exchanged zeolites is further discussed.
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Huang, M., Kaliaguine, S. Reactions of methylbutynol on alkali-exchanged zeolites. A Lewis acid-base selectivity study. Catal Lett 18, 373–389 (1993). https://doi.org/10.1007/BF00765284
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DOI: https://doi.org/10.1007/BF00765284