Study of metal oxide catalysts in the olefin oxidation from their reduction behavior--2. Reduction of ZnO with propylene

Journal Article · Mon Oct 15 04:00:00 EDT 1979 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/S0021-9517(79)80006-8· OSTI ID:6463223

Aso, I; Abe, S; Yamazoe, N; Seiyama, T

The reduction of zinc oxide with 0.15 atm propylene at 500/sup 0/C and 0.5 g sec/cc contact time produced decreasing amounts of carbon dioxide, benzene, and acetone during the initial 20 min of the reaction, and 1,5-hexadiene for about 100 min with a large maximum at 15-20 min The reactions involved only surface oxygens and did not produce a change in zinc oxide that could be detected by X-ray diffraction. Addition of water to the propylene feed increased the production of acetone in proportion to the water pressure. At 0.06-0.21 atm propylene pressure, the hexadiene and benzene formation was second order, acetone formation was first order, and carbon dioxide formation was zero order in propylene; the reaction period remained unchanged. The results were consistent with the existence of two types of oxygen, of which one was a very reactive surface species that formed carbon dioxide, and the other a lattice oxygen associated with lattice defects that was involved in the formation of the other products. The mechanism and the kinetics of the zinc oxide surface reduction are discussed.

• Research Organization: Kyushu Univ.
• OSTI ID: 6463223
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 59:3; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACETONE
ALKENES
AROMATICS
BENZENE
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIENES
ELEMENTS
HIGH TEMPERATURE
HYDROCARBONS
KETONES
KINETICS
LOW PRESSURE
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLYENES
PROPYLENE
REACTION KINETICS
REDUCTION
SURFACE PROPERTIES
SURFACES
TIME DEPENDENCE
YIELDS
ZINC COMPOUNDS
ZINC OXIDES