A mechanistic study of the oxygen insertion into MoO sub 3 crystals as revealed by SIMS and TPSR techniques

Static secondary ion mass spectroscopy (SIMS) and temperature-programmed surface reaction (TPSR) probes were used to characterize the nature and participation of oxygen species of MoO{sub 3} crystals in the selective oxidation of propylene. The SIMS analysis of the oxygen-18-containing fragments of...

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Bibliographic Details
Published in:Journal of catalysis 1992-10, Vol.137:2
Main Authors: Ruiz, A. Guerrero, Blanco, J.M., Aguilar, M., Ramos, I. Rodriguez, Fierro, J.L.G.
Format: Article
Language:English
Subjects:
02 PETROLEUM
020400 > Petroleum-- Processing
10 SYNTHETIC FUELS
100200 > Synthetic Fuels-- Production-- (1990-)
ALKENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMISORPTION
CONTROL
CRYSTAL STRUCTURE
EVEN-EVEN NUCLEI
HYDROCARBONS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
ION MICROPROBE ANALYSIS
ISOTOPES
LIGHT NUCLEI
MASS SPECTROSCOPY
MICROANALYSIS
MICROSTRUCTURE
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONDESTRUCTIVE ANALYSIS
NUCLEI
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PROPYLENE
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
STABLE ISOTOPES
SURFACE PROPERTIES
TEMPERATURE CONTROL
TRANSITION ELEMENT COMPOUNDS 400201 > Chemical & Physicochemical Properties
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Description
Summary:Static secondary ion mass spectroscopy (SIMS) and temperature-programmed surface reaction (TPSR) probes were used to characterize the nature and participation of oxygen species of MoO{sub 3} crystals in the selective oxidation of propylene. The SIMS analysis of the oxygen-18-containing fragments of two MoO{sub 3} crystals, processing different exposed crystallographic planes and pretreated under the {sup 18}O{sub 2} + C{sub 3}H{sub 6} mixture, allowed monitoring of the directional {sup 18}O labeling within the crystals. Moreover, the insertion level of oxygen-18 into the acrolein reaction product has been evaluated by mass spectroscopy. TPRS of chemisorbed NO has been used to evaluate the reactivity of surface oxygen ions. From these results a simple model for explaining the observed structure-sensitive partial oxidation of propylene on well-defined MoO{sub 3} crystal structures is proposed.
ISSN:0021-9517
1090-2694