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Title: Comparison of the. cap alpha. -,. beta. -, and. gamma. -phases of bismuth molybdate for the selective oxidation of propylene

Abstract

The study was based on experimental data published elsewhere, which showed that at above approx. 410/sup 0/C, the rate of allyl formation was rate-determining, and that at lower temperatures, the reoxidation of the reduced catalyst was the slowest step. A comparison of the propylene oxidation rates at high temperatures suggested that the differences between the rates obtained on the three catalytic phases depended only on the intrinsic difference in the concentration of sites active for allyl formation. In the temperature region controlled by catalyst reoxidation, the over-all activation energy was composed of the activation energy for dissociative oxygen adsorption (36.8, 30.4, and 31.6 kcal/mole for the ..cap alpha..-, ..beta..-, and ..gamma..-phases, respectively) plus the activation energy for diffusion of oxide vacancies (16.2, 10.6, and 11.4 kcal/mole for the ..cap alpha..-, ..beta..-, and ..gamma..-phases, respectively), where the higher value for the (ALPHA)-phase diffusion activation energy is attributed to the more ''closed'' structure of this phase.

Authors:
;
Publication Date:
Research Org.:
Univ. of Wisconsin, Milwaukee
OSTI Identifier:
7139050
Alternate Identifier(s):
OSTI ID: 7139050
Report Number(s):
CONF-790415-
Journal ID: CODEN: ACPCA
Resource Type:
Conference
Journal Name:
Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)
Additional Journal Information:
Journal Volume: 24:1; Conference: 177. national meeting of the American Chemical Society, Honolulu, HI, USA, 1 Apr 1979
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BISMUTH COMPOUNDS; CATALYTIC EFFECTS; PHASE STUDIES; MOLYBDATES; PROPYLENE; OXIDATION; ACTIVATION ENERGY; CATALYSTS; CHEMICAL REACTION KINETICS; COMPARATIVE EVALUATIONS; HIGH TEMPERATURE; PHASE TRANSFORMATIONS; TEMPERATURE EFFECTS; ALKENES; CHEMICAL REACTIONS; ENERGY; HYDROCARBONS; KINETICS; MOLYBDENUM COMPOUNDS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; REACTION KINETICS; TRANSITION ELEMENT COMPOUNDS 400201* -- Chemical & Physicochemical Properties; 400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)

Citation Formats

Monnier, J.R., and Keulks, J.W. Comparison of the. cap alpha. -,. beta. -, and. gamma. -phases of bismuth molybdate for the selective oxidation of propylene. United States: N. p., 1979. Web.
Monnier, J.R., & Keulks, J.W. Comparison of the. cap alpha. -,. beta. -, and. gamma. -phases of bismuth molybdate for the selective oxidation of propylene. United States.
Monnier, J.R., and Keulks, J.W. Thu . "Comparison of the. cap alpha. -,. beta. -, and. gamma. -phases of bismuth molybdate for the selective oxidation of propylene". United States.
@article{osti_7139050,
title = {Comparison of the. cap alpha. -,. beta. -, and. gamma. -phases of bismuth molybdate for the selective oxidation of propylene},
author = {Monnier, J.R. and Keulks, J.W.},
abstractNote = {The study was based on experimental data published elsewhere, which showed that at above approx. 410/sup 0/C, the rate of allyl formation was rate-determining, and that at lower temperatures, the reoxidation of the reduced catalyst was the slowest step. A comparison of the propylene oxidation rates at high temperatures suggested that the differences between the rates obtained on the three catalytic phases depended only on the intrinsic difference in the concentration of sites active for allyl formation. In the temperature region controlled by catalyst reoxidation, the over-all activation energy was composed of the activation energy for dissociative oxygen adsorption (36.8, 30.4, and 31.6 kcal/mole for the ..cap alpha..-, ..beta..-, and ..gamma..-phases, respectively) plus the activation energy for diffusion of oxide vacancies (16.2, 10.6, and 11.4 kcal/mole for the ..cap alpha..-, ..beta..-, and ..gamma..-phases, respectively), where the higher value for the (ALPHA)-phase diffusion activation energy is attributed to the more ''closed'' structure of this phase.},
doi = {},
journal = {Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)},
number = ,
volume = 24:1,
place = {United States},
year = {1979},
month = {2}
}

Conference:
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