Uncatalyzed and MoO sub 3 -catalyzed carbon-oxygen reaction: A kinetic study

A kinetic study was made of the reaction of activated carbon with oxygen, uncatalyzed and catalyzed by MoO{sub 3}, using a microbalance to record the loss of weight as a function of time. Orders and activation energies were measured. MoO{sub 3} was found to be a moderate catalyst for this reaction....

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Bibliographic Details
Published in:Journal of catalysis 1990-12, Vol.126:2
Main Authors: Silva, I.F., Lobo, L.S.
Format: Article
Language:English
Subjects:
01 COAL, LIGNITE, AND PEAT
010404 - Coal, Lignite, & Peat- Gasification
ACTIVATED CARBON
ACTIVATION ENERGY
ADSORBENTS
BALANCES
CARBON
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COAL GASIFICATION
COMPARATIVE EVALUATIONS
DIFFUSION
ELEMENTS
ENERGY
GASIFICATION
KINETICS
LOADING RATE
LOSSES
MEASURING INSTRUMENTS
MICROBALANCES
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
WEIGHT
WEIGHT INDICATORS
WEIGHT MEASUREMENT
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Summary:A kinetic study was made of the reaction of activated carbon with oxygen, uncatalyzed and catalyzed by MoO{sub 3}, using a microbalance to record the loss of weight as a function of time. Orders and activation energies were measured. MoO{sub 3} was found to be a moderate catalyst for this reaction. The effect of loading on reactivity is linear for low loadings and shows saturation above 2.5 wt%. It is proposed that this type of reaction, involving three phases and two interfaces, can be explained by surface catalysis at the gas/catalyst interface with continuous diffusion of carbon atoms through the catalyst.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(90)90015-C