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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Synthesis, characterization, and catalytic function of novel highly dispersed tungsten oxide catalysts on inesoporous silica

Cited 77 times inthomson ciCited 81 times inthomson ci
Title
Synthesis, characterization, and catalytic function of novel highly dispersed tungsten oxide catalysts on inesoporous silica
Other Titles
Synthesis, characterization, and catalytic function of novel highly dispersed tungsten oxide catalysts on inesoporous silica
Author
Herrera, JEKwak, JahunHu, JZWang, YPeden, CHFMacht, JIglesia, E
Keywords
tungsten oxide; SBA-15; methanol dehydration; 2-butanol dehydration; DRS UV-vis; TEM; H-1 NMR; XRD; TPO
Issue Date
2006-04
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation
JOURNAL OF CATALYSIS, v.239, no.1, pp.200 - 211
Abstract
The physical and chemical properties of tungsten oxide supported on SBA-15 rnesoporous silica prepared by a controlled grafting process through atomic layer deposition (ALD) were studied using complementary characterization methods. X-ray diffraction, optical absorption, and transmission electron microscopy showed that tungsten oxide species are highly dispersed on SBA-15 surfaces, even at 30 wt% WO, content (surface density, 1.33 WOx/nm(2)). ALD methods led to samples with much better thermal stability than those prepared via impregnation. Dehydration reactions of 2-butanol and methanol dehydration were used as probe reactions. Differences in reaction rates between the samples prepared by ALD and conventional impregnation may reflect the sintering resistance of catalysts prepared by ALD. Notably, temperature-programmed oxidation of spent catalysts showed that carbon formation was not responsible for the different dehydration rates in samples prepared by ALD and impregnation. (c) 2006 Elsevier Inc. All rights reserved
URI
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DOI
10.1016/j.jcat.2006.01.034
ISSN
0021-9517
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ECHE_Journal Papers
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