Synthesis, Characterization, and Catalytic Function of Novel Highly Dispersed Tungsten Oxide Catalysts on Mesoporous Silica
The physical and chemical properties of tungsten oxide supported on SBA-15 mesoporous 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.% WOx contents (surface density: 1.33 WOx/nm2). 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 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..
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 881683
- Report Number(s):
- PNNL-SA-46575; 13490; 10601; 10895; 9103; KC0302010
- Journal Information:
- Journal of Catalysis, 239(1):200-211, Journal Name: Journal of Catalysis, 239(1):200-211 Journal Issue: 1 Vol. 239; ISSN JCTLA5; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
1H-NMR
2-butanol dehydration
ABSORPTION
Atomic layer deposition
CARBON
CATALYSTS
CHEMICAL PROPERTIES
DEHYDRATION
DEPOSITION
Environmental Molecular Sciences Laboratory
IMPREGNATION
METHANOL
OXIDATION
PROBES
REACTION KINETICS
SILICA
SINTERING
STABILITY
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
TUNGSTEN OXIDES
UV-Vis DRS
X-RAY DIFFRACTION
methanol dehydration
tungsten oxide