Title: Novel mesoporous composites of gallia nanoparticles and silica as catalysts for the epoxidation of alkenes with hydrogen peroxide
Authors: Lueangchaichaweng, Warunee
Li, Li
Wang, Quan-Yi
Su, Bao-Lian
Aprile, Carmela
Pescarmona, Paolo # ×
Issue Date: 2013
Publisher: Elsevier Science Publishers
Series Title: Catalysis Today vol:203 pages:66-75
Article number: doi:10.1016/j.cattod.2012.02.037
Abstract: A new class of structured mesoporous materials consisting of gallium oxide nanoparticles embedded and
stabilised in a silica matrix was designed, synthesised and tested as catalysts for the epoxidation of various
alkenes with aqueous hydrogen peroxide. The structure and texture of the mesoporous gallia–silica composites
were elucidated by powder X-ray diffraction, isothermal N2 sorption and TEM. The most active
epoxidation catalysts are the materials containing 80 and 90% of Ga2O3 nanoparticles. These materials
give much higher epoxide yields compared to the parent nanoparticles, thus demonstrating the positive
effect of structuring on the catalytic performance. The synthesis of the mesoporous gallia-silica composite
catalysts was optimised by investigating the effect of the calcination conditions. Finally, different
methods for recycling the catalysts were studied. Mild calcination at 250 ◦C for 3 h under controlled N2
flow was identified as the most suitable treatment to retain the catalytic activity upon reuse.
ISSN: 0920-5861
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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