Journal
CHEMCATCHEM
Volume 9, Issue 6, Pages 1076-1083Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201601127
Keywords
alkylation of phenols; bifunctional heterogeneous catalysis; green chemistry; shape selectivity; zeolites
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Funding
- National Natural Science Foundation of China [21136005, 21303084, 21476109]
- Jiangsu Provincial Science Foundation for Youths [BK20130921]
- Specialized Research Fund for the Doctoral Program of Higher Education [20133221120002]
- PAPD
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Novel Mg-bearing BEA zeolites are synthesized to simultaneously endow significantly enhanced basicity without compromising acidity over the zeolite framework. Serving as efficient solid acid-base bifunctional catalysts, they achieve the liquid-phase selective methylation of phenol with methanol to produce o- and p-cresol (o/p=2) under mild conditions. The method is readily extendable to the alkylation of phenols with various alcohols. Stereo-and regioselectivity (>95% for p-product) was attained on the alkylation of phenol with bulky tert-butyl alcohol, rendering the first acid-base cooperative shape-selective catalysis relying on the basicity of zeolites. A preliminary mechanistic analysis reveals that the remarkable activity and shape-selectivity come from the superior special acidic-basic synergetic catalytic sites on the uniform microporous channels of the BEA zeolite.
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