Phenol alkylation with isobutene — influence of heterogeneous Lewis and/or Brønsted acid sites |
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| Authors: | Elena Modrogan Michael H Valkenberg Wolfgang F Hoelderich |
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| Affiliation: | 1. Key laboratory of Catalysis Science and Technology of Chongqing Education Commission, Chongqing Technology and Business University, Chongqing 400067, China;2. Shanghai Key Lab of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai 200062, China;3. Centre for Organic Electronics, School of Mathematical and Physical Sciences, Faculty of Science and IT, University of Newcastle, Callaghan, NSW 2308, Australia |
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| Abstract: | Acidic solid catalysts with different types of acidity were used to study the liquid-phase alkylation of phenol with isobutene. A phosphonium ionic liquid immobilized on silica type carrier exhibiting pure Lewis acidity, Amberlyst 15 with pure Brønsted acidity as well as WO3/ZrO2 with both types of acid sites were used for this study. The active sites are postulated based on pyridine-FT-IR and NH3-TPD studies, BET analyses, MAS NMR and XRD measurements. The different properties of the chosen catalysts are mirrored in the product distribution of the reaction mixture. It was found that WO3/ZrO2 is a very active and selective catalyst for the production of 2,4-di-tert-butylphenol under mild reaction conditions. |
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