Journal
JOURNAL OF CATALYSIS
Volume 204, Issue 1, Pages 64-70Publisher
ACADEMIC PRESS INC
DOI: 10.1006/jcat.2001.3352
Keywords
epoxidation; styrene; styrene oxide; urea-hydrogen peroxide; TS-1; UV-Vis; EPR
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The use of anhydrous urea-hydrogen peroxide adduct as an oxidizing agent in the epoxidation of styrene catalyzed by a titanium-silicate (TS-1) molecular sieve resulted in very high selectivity (similar to 85%) for styrene oxide. When aqueous hydrogen peroxide (H2O2) was used for styrene epoxidation, the styrene oxide selectivity was very poor (5-10%) mainly due to its isomerization into phenylacetaldehyde. The formation of different types of Ti-superoxo complexes was also observed by the solid-solid interaction with anhydrous urea-hydrogen peroxide and TS-1. It was confirmed by the characteristic continuous absorption band in the UV-Vis region (300-500 nm) and also by an intense and anisotropic EPR spectrum for the superoxide radical ion stabilized on Ti (IV) centers of TS-1 samples. (C) 2001 Academic Press.
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