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곽자훈

Kwak, Ja Hun
Molecular Catalysis Lab.
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Synthesis, characterization, and catalytic function of novel highly dispersed tungsten oxide catalysts on inesoporous silica

Alternative Title
Synthesis, characterization, and catalytic function of novel highly dispersed tungsten oxide catalysts on inesoporous silica
Author(s)
Herrera, JEKwak, JahunHu, JZWang, YPeden, CHFMacht, JIglesia, E
Issued Date
2006-04
DOI
10.1016/j.jcat.2006.01.034
URI
https://scholarworks.unist.ac.kr/handle/201301/12433
Fulltext
http://www.sciencedirect.com/science/article/pii/S002195170600042X
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
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
ISSN
0021-9517
Keyword (Author)
tungsten oxideSBA-15methanol dehydration2-butanol dehydrationDRS UV-visTEMH-1 NMRXRDTPO
Keyword
MESOPOROUS MOLECULAR-SIEVESBRONSTED ACID SITESSKELETAL ISOMERIZATIONISOBUTANE DEHYDROGENATIONSELECTIVE ISOMERIZATIONACTIVATED CARBONSURFACE-ACIDITYMETAL-OXIDESPROTON NMRDEHYDRATION

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