The role of mobile oxygen species in the selective oxidation of isobutene

Conference · Sat Aug 01 00:00:00 EDT 1987 · American Chemical Society, Division of Petroleum Chemistry, Preprints; (USA)

OSTI ID:5334974

Ruiz, P; Delmon, B ^[1]

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1. Univ. Catholique de Louvain (Belgium)

A simple experiment can introduce this contribution: SB{sub 2}O{sub 4} particles on the one hand, and SnO{sub 2} particles on the other hand, are prepared independently, and then mixed at room temperature. A comparison of the methacrolein yields in isobutene oxidation over identical weights of mixtures of different compositions indicates a dramatic synergy: for adequate proportions (Sb{sub 2}O{sub 4}/(Sb{sub 2}O{sub 4} + Sno{sub 2}) = 0.3-0.6) the yield is multiplied by a factor of ten, compared to the added yields which would be reached with the corresponding weights of the simple oxides, if isolated. There is no indication of formation of any mixed phase during the catalytic experiments. All industrial oxide catalysts used for selective catalytic oxidation are composed of more than one phase. The above mentioned results suggest that there is a fundamental reason for that. But the majority of the fundamental studies have dealt with single phases and all the published mechanisms consider phenomena taking place in a single phase. The factors influencing activity and selectivity which are considered are those corresponding to the characteristics of this single phase. Our objective was to investigate the role of external phases.

• OSTI ID: 5334974
• Report Number(s): CONF-8708314-; CODEN: ACPCA
• Journal Information: American Chemical Society, Division of Petroleum Chemistry, Preprints; (USA), Vol. 32:3; Conference: Symposium on hydrocarbon oxidation, New Orleans, LA (USA), 30 Aug - 4 Sep 1987; ISSN 0569-3799
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
2-METHYLPROPENE
OXIDATION
ANTIMONY OXIDES
CATALYTIC EFFECTS
MOLYBDENUM OXIDES
TIN OXIDES
CATALYSIS
CATALYSTS
CHEMICAL REACTION YIELD
EXPERIMENTAL DATA
OXYGEN
PHASE STUDIES
SYNERGISM
ALKENES
ANTIMONY COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
ELEMENTS
HYDROCARBONS
INFORMATION
MOLYBDENUM COMPOUNDS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
TIN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YIELDS
020400* - Petroleum- Processing
400201 - Chemical & Physicochemical Properties