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

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Journal of Catalysis; (United States)

OSTI ID:7241375

Ruiz, A Guerrero ^[1]; Blanco, J M; Aguilar, M ^[2]; Ramos, I Rodriguez; Fierro, J L.G. ^[3]

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1. Facultad de Ciencias, Madrid (Spain)
2. ETSI, Telecomunication, Madrid (Spain)
3. Inst. de Catalisis y Petroleoquimica, Contoblanco, Madrid (Spain)

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.

• OSTI ID: 7241375
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 137:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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ALKENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMISORPTION
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CRYSTAL STRUCTURE
EVEN-EVEN NUCLEI
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MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
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NITROGEN COMPOUNDS
NITROGEN OXIDES
NONDESTRUCTIVE ANALYSIS
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ORGANIC COMPOUNDS
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PROPYLENE
REFRACTORY METAL COMPOUNDS
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STABLE ISOTOPES
SURFACE PROPERTIES
TEMPERATURE CONTROL
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