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The kinetics of selective oxidation of propene on bismuth vanadium molybdenum oxide catalysts

Journal Article · · Journal of Catalysis
 [1];  [1];  [1]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Chemical Engineering
In this study, we report the results of a systematic investigation of the kinetics of propene oxidation to acrolein over Bi1-$$x$$/3V1-$$x$$Mo$$x$$O4. BET isotherms were measured to determine catalyst surface area, and powder X-ray diffraction was used to characterize the bulk structure. Further characterization by X-ray absorption near-edge spectroscopy (XANES) was used to determine the oxidation states of Bi, Mo, and V before and after exposure of the catalyst to propene at 713 K. We find that, contrary to previous discussions of the mechanism of propene oxidation on Bi1-$$x$$/3V1-$$x$$Mo$$x$$O4, Bi remains in the 3+ state and only V and Mo undergo reduction and oxidation during reaction. The kinetics of propene oxidation were examined to establish the activation barrier for acrolein formation, and how the partial pressure dependences on propene and oxygen change with the value of $$x$$. The data obtained from this study were then used to propose a generalized model for the kinetics of propene oxidation over Bi1-$$x$$/3V1-$$x$$Mo$$x$$O4 that is consistent with our findings about the reducibility of the three metallic elements in the oxide. According to this model, vanadium and molybdenum are randomly distributed to form three types of sites each associated with its own rate parameters. MoV sites are found to exhibit the highest activity. The proposed model provides a good description of the experimental data for all catalyst formulations examined, for a range of propene and oxygen partial pressures, and for temperatures above 653 K.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1570979
Alternate ID(s):
OSTI ID: 1110432
Journal Information:
Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: C Vol. 308; ISSN 0021-9517
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Bismuth Molybdate Catalysts Prepared by Mild Hydrothermal Synthesis: Influence of pH on the Selective Oxidation of Propylene journal September 2015
Simple soluble Bi( iii ) salts as efficient catalysts for the oxidation of alkanes with H 2 O 2 journal January 2015
Catalytic oxidative coupling promoted by bismuth TEMPOxide complexes journal January 2018
Glycerol as a potential renewable raw material for acrylic acid production journal January 2017
Pathways, mechanisms, and kinetics: a strategy to examine byproduct selectivity in partial oxidation catalytic transformations on reducible oxides journal January 2019
Photoelectrocatalytic degradation of emerging contaminants at WO 3 /BiVO 4 photoanodes in aqueous solution journal January 2019
Catalytic Oxidation of Propene over Pd Catalysts Supported on CeO2, TiO2, Al2O3 and M/Al2O3 Oxides (M = Ce, Ti, Fe, Mn) journal April 2015
Structural Evolution of Highly Active Multicomponent Catalysts for Selective Propylene Oxidation journal August 2018
Structural evolution of highly active multicomponent catalysts for selective propylene oxidation text January 2018

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