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dc.contributor.authorYan, Wenjuan
dc.contributor.authorRamanathan, Anand
dc.contributor.authorGhanta, Madhav
dc.contributor.authorSubramaniam, Bala
dc.identifier.citationYan, Wenjuan, Anand Ramanathan, Madhav Ghanta, and Bala Subramaniam. "Towards Highly Selective Ethylene Epoxidation Catalysts Using Hydrogen Peroxide and Tungsten- or Niobium-incorporated Mesoporous Silicate (KIT-6)." Catal. Sci. Technol. 4.12 (2014): p4433-439.
dc.descriptionThis is the published version. Copyright 2014 Royal Society of Chemistryen_US
dc.description.abstractSignificant ethylene epoxidation activity was observed over Nb- and W-incorporated KIT-6 materials with aqueous hydrogen peroxide (H2O2) as the oxidant and methanol as solvent under mild operating conditions (35 °C and 50 bar) where CO2 formation is avoided. The Nb-KIT-6 materials generally show greater epoxidation activity compared to the W-KIT-6 materials. Further, the ethylene oxide (EO) productivity observed with these materials [30–800 mg EO h−1 (g metal)−1] is of the same order of magnitude as that of the conventional silver (Ag)-based gas phase ethylene epoxidation process. Our results reveal that the framework-incorporated metal species, rather than the extra-framework metal oxide species, are mainly responsible for the observed epoxidation activity. However, the tetrahedrally coordinated framework metal species also introduce Lewis acidity that promotes their solvolysis (which in turn results in their gradual leaching) as well as H2O2 decomposition. These results and mechanistic insights provide rational guidance for developing catalysts with improved leaching resistance and minimal H2O2 decomposition.en_US
dc.publisherRoyal Society of Chemistryen_US
dc.titleTowards highly selective ethylene epoxidation catalysts using hydrogen peroxide and tungsten- or niobium-incorporated mesoporous silicate (KIT-6)en_US
kusw.kuauthorSubramaniam, Bala
kusw.kudepartmentChemical & Petroleum Engren_US
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kusw.oaversionScholarly/refereed, publisher version
kusw.oapolicyThis item meets KU Open Access policy criteria.

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