Influence of heat treatment in an oxidizing medium on the properties of copper-zinc-chromium-aluminum oxide catalyst for dehydrogenation of cyclohexanol

Journal Article · Wed Jul 20 00:00:00 EDT 1988 · J. Appl. Chem. USSR (Engl. Transl.); (United States)

OSTI ID:6334335

Sapozhnikova, F Kh; Fridman, V Z; Petrov, I Ya; Polovkina, T S; Kriventsova, E A

The authors report the results of a study of changes in the structure and catalytic properties of a copper-zinc-chromium-aluminum (CuZnCrAl) oxide catalyst, used for dehydrogenation of cyclohexanol, under the influence of heat treatment in an oxidizing medium. A catalyst of the composition (mass %): CuO 54.0, ZnO 12.0, Cr/sub 2/O/sub 3/ 11.0, Al/sub 2/O/sub 3/ 20.0, the rest being graphite, was prepared by the wet mixing method for the investigation. The resultant mixture was dried at 110/sup 0/ and calcined at 350/sup 0/, after which the mass was mixed with graphite and tableted. The synthesized catalyst was then heated again. Heat treatment of copper-zinc-chromium-aluminum catalyst in an oxidizing medium at 400-550/sup 0/ leads, first, to change of its phase composition and formation of zinc(II) and copper(II) chromites and aluminum oxide in the system and, second, to decrease of the degree of dispersion of metallic copper after reduction of the catalyst. The combination of these factors tends to lower the activity of the catalyst and to raise the rate of by-product formation.

• OSTI ID: 6334335
• Journal Information: J. Appl. Chem. USSR (Engl. Transl.); (United States), Vol. 61:2; Other Information: Translated from Zh. Prikl. Khim.; 61: No. 2, 274-280(Feb 1988)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
CATALYTIC EFFECTS
CATALYSTS
TEMPERATURE EFFECTS
CHROMIUM OXIDES
COPPER OXIDES
CYCLOHEXANOL
DEHYDROGENATION
ZINC OXIDES
CALCINATION
CHROMATOGRAPHY
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CYCLOHEXANONE
DIFFERENTIAL THERMAL ANALYSIS
GRAPHITE
HEAT TREATMENTS
OXIDATION
REGENERATION
X-RAY DIFFRACTION
ALCOHOLS
ALUMINIUM COMPOUNDS
CARBON
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
COHERENT SCATTERING
COPPER COMPOUNDS
DECOMPOSITION
DIFFRACTION
ELEMENTAL MINERALS
ELEMENTS
HYDROXY COMPOUNDS
KETONES
MINERALS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PYROLYSIS
SCATTERING
SEPARATION PROCESSES
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
400201* - Chemical & Physicochemical Properties