Influence of synthesis methods on tungsten dispersion, structural deformation, and surface acidity in binary WO(sub 3)-ZrO(sub 2) system
Article Abstract:
WO(sub 3)-ZrO(sub 2) catalysts are synthesized by precipitating the aqueous solutions of zirconium oxynitrate and ammonium metatungstate with ammonium hydroxide. The catalyst obtained under hydrothermal condition exhibited the highest dispersion of tungsten species in the zirconia, which in turn causes strong structural deformation of the tetragonal ZrO(sub 2) phase responsible of the strongest surface acidity and consequently the optimum catalytic activity for n-hexane isomerization.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
User Contributions:
Comment about this article or add new information about this topic:
Oxygen-release/storage properties of [Ce.sub.0.5][M.sub.0.5][O.sub.2] (M = Zr, Hf) oxides: Interplay of crystal chemistry and electronic structure
Article Abstract:
Fluorite-type [Ce.sub.0.5][M.sub.0.5][O.sub.2] and [Ce.sub.0.5][Hf.sub.0.5][O.sub.2] are synthesized by a solution combustion route, and their oxygen release and reduction are investigated. The results have shown the unique role of zirconium, which is different from that of hafnium in the oxygen release/uptake of [Ce.sub.0.5][Zr.sub.0.5][O.sub.2] and [Ce.sub.0.5][Hf.sub.0.5][O.sub.2] solid solutions, as well as the possibility of the formation of highly reduced pyrochlore-II.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2007
User Contributions:
Comment about this article or add new information about this topic:
Spectroscopic characterization of heterogeneity and redox effects in zirconium-cerrium (1:1) mixed oxides prepared by microemulsion methods
Article Abstract:
A combination of physiochemical techniques is used to study two Zr-Ce (1:1 molar ratio) mixed oxide specimens. Heterogeneity differences are identified in these materials that can be detected only by the EPR and XPS/Ar(super +) etching experiments.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2003
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Influence of carbon-chloride surface complexes on the properties of tungsten oxide supported on activated carbons.2. Surface acidity and skeletal
- Abstracts: Influence of carbon-chloride surface complexes on the properties of tungsten oxide supported on activated carbons.2. Surface acidity and skeletal. part 2
- Abstracts: Enhanced dye-sensitized photoconversion efficiency via reversible production of UV-induced surface states in nanoporous TiO2
- Abstracts: The influence of N7 guanine modification on the strength of Watson-Crick base pairing and guanine N1 acidity: comparison of gas-phase and condensed-phase trends
- Abstracts: Glass transition of a synthetic phospholipid in the lamellar phase. Chain order in lipid bilayers: FTIR and solid state NMR studies on bilayer membranes from 1,2-dimyristoyl-sn-glycero-3-phosphoglucose