Structure and reactivity of vanadium oxide catalysts supported on anatase TiO2

Article Abstract:

A study was conducted to characterize a series of TiO2 supported vanadia catalysts with V2O5 loadings. Temperature-programmed reduction, x-ray diffraction, electron spin resonance and oxygen chemisorption techniques were used to analyze the catalysts. Results indicated that vanadium is highly dispersed on titania support. Findings also showed that the catalytic activity during 3-picoline ammoxidation correlated with the dispersion of vanadia.

Titanium dioxide, Vanadium

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Characterization of MoO3/TiO2 (anatase) catalysts by ESR, 1H MAS NMR, and oxygen chemisorption

Article Abstract:

1H magic angle spinning (MAS) nuclear magnetic resonance (NMR), X-ray diffraction (XRD), oxygen chemisorption and ESR were used to study a series of MoO3/TiO2 catalysts. The 1H MAS NMR spectra suggest the presence of two types of OH groups in T1O2. Oxygen chemisorption revealed that molybdenum oxide is present in high dispersed state at low molybdenum loadings. ESR results revealed the presence of Mo5+ in the reduced catalysts.

Usage, Nuclear magnetic resonance spectroscopy, Molybdenum compounds

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Characterization and reactivity of molybdenum oxide catalysts supported on niobia

Article Abstract:

A series of MoO3/Nb2O5 catalysts with Mo loadings varying from 2.5 to 15 wt percentage are prepared and characterized by X-ray diffraction, temperature-programmed reduction, temperature-programmed desorption of ammonia. The catalytic properties are evaluated for the vapor-phase ammoxidation of 3-picoline to nicotinonitrile and related to oxygen chemisorption sites.

Science & research, Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Columbium, Optical properties, Molybdenum oxides, Niobium

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