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Aerobic Oxidation of Styrene over Indium‐Impregnated Mesoporous Silica: Distinctive Effect of Supports on Epoxidation Activity
Author(s) -
Das Prangya Paramita,
Chowdhury Biswajit
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202003328
Subject(s) - styrene , selectivity , catalysis , mesoporous material , indium , mesoporous silica , dispersion (optics) , materials science , chemical engineering , oxide , oxygen , inorganic chemistry , chemistry , copolymer , organic chemistry , metallurgy , composite material , polymer , physics , optics , engineering
Liquid phase oxidation of styrene was performed over a series of indium impregnated mesoporous silica materials In‐KIT‐6, In‐HMS‐X and In‐TUD‐1 of different morphologies with a constant indium loading of 1 wt % using molecular oxygen as an oxidant. Among these catalysts, In‐HMS‐X showed superior catalytic activity in terms of styrene conversion of 57 % and In‐TUD‐1 in terms of styrene oxide selectivity of 90 % . Larger surface area, larger pore diameter, more surface hydrophobicity, more surface acidity were found to be the deciding factors for better conversion. More oxygen uptake, higher reducibility of In species and well dispersion of metal over support were found to be the key enablers for better selectivity. All the catalysts were recyclable up to 5 th cycle.