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

Journal Article · Mon Oct 15 00:00:00 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), Vol. 59:3
• Country of Publication: United States
• Language: English

Related Subjects

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