Synthesis, Characterization, and Catalytic Function of Novel Highly Dispersed Tungsten Oxide Catalysts on Mesoporous Silica

Journal Article · Sat Apr 01 00:00:00 EST 2006 · Journal of Catalysis, 239(1):200-211

DOI:https://doi.org/10.1016/j.jcat.2006.01.034· OSTI ID:881683

Herrera, Jose E; Kwak, Ja Hun; Hu, Jian Zhi; Wang, Yong; Peden, Charles HF; Macht, Josef; Iglesia, Enrique

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 Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 881683
• Report Number(s): PNNL-SA-46575; JCTLA5; 13490; 10601; 10895; 9103; KC0302010; TRN: US200613%%70
• Journal Information: Journal of Catalysis, 239(1):200-211, Vol. 239, Issue 1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
ABSORPTION
CARBON
CATALYSTS
CHEMICAL PROPERTIES
DEHYDRATION
DEPOSITION
IMPREGNATION
METHANOL
OXIDATION
PROBES
REACTION KINETICS
SILICA
SINTERING
STABILITY
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
TUNGSTEN OXIDES
X-RAY DIFFRACTION
Atomic layer deposition
tungsten oxide
methanol dehydration
2-butanol dehydration
UV-Vis DRS
1H-NMR
Environmental Molecular Sciences Laboratory