Jump to main content
Jump to site search

Issue 12, 2014
Previous Article Next Article

Towards highly selective ethylene epoxidation catalysts using hydrogen peroxide and tungsten- or niobium-incorporated mesoporous silicate (KIT-6)

Author affiliations

Abstract

Significant 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.

Graphical abstract: Towards highly selective ethylene epoxidation catalysts using hydrogen peroxide and tungsten- or niobium-incorporated mesoporous silicate (KIT-6)

Back to tab navigation

Supplementary files

Publication details

The article was received on 06 Jul 2014, accepted on 02 Aug 2014 and first published on 05 Aug 2014


Article type: Paper
DOI: 10.1039/C4CY00877D
Author version available: Download Author version (PDF)
Citation: Catal. Sci. Technol., 2014,4, 4433-4439
  •   Request permissions

    Towards highly selective ethylene epoxidation catalysts using hydrogen peroxide and tungsten- or niobium-incorporated mesoporous silicate (KIT-6)

    W. Yan, A. Ramanathan, M. Ghanta and B. Subramaniam, Catal. Sci. Technol., 2014, 4, 4433
    DOI: 10.1039/C4CY00877D

Search articles by author

Spotlight

Advertisements