Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 245, Issue -, Pages 118-125Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2017.03.001
Keywords
EISA; Mesoporous; Molybdenum; Metathesis
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Funding
- National Science Foundation and Environmental Protection Agency [NSF-EPA 1339661]
- NSF [OIA-1539105]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1339661] Funding Source: National Science Foundation
- Office of Integrative Activities
- Office Of The Director [1539105] Funding Source: National Science Foundation
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Molybdenum-incorporated mesoporous silicates with different Si/Mo ratios were synthesized via the Evaporation Induced Self-Assembly (EISA) method. SAXS and nitrogen physisorption results confirm the ordered mesoporosity. The BET surface area, pore volume and pore size distribution generally decrease with Mo loading while preserving the mesoporosity. Highly dispersed monomeric and oligomeric MoOx species (Mo6+ oxidation state) were evident from diffuse reflectance UV-Vis and XPS spectra. H-2-TPR results confirm the existence of polymeric MoOx and bulk crystalline MoO3 species. At lower loadings, Mo exits in both tetrahedral and octahedral symmetry as established by Mo L-3-edge XANES studies. Mo-EISA catalysts with highly dispersed isolated MoOx sites display stable activity for 2-butene+ethylene metathesis that is comparable to those reported for WO3/SiO2 catalysts. (C) 2017 Elsevier Inc. All rights reserved.
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