Dehydrogenation of cyclohexane and isoamylenes on nickel and calcium-nickel phosphate catalysts

Journal Article · Fri Jan 01 04:00:00 EST 1982 · Pet. Chem. USSR (Engl. Transl.); (United States)

DOI:https://doi.org/10.1016/0031-6458(82)90001-6· OSTI ID:6948629

Sadykov, F F

In the dehydrogenation of C/sub 4/ and C/sub 5/ olefins on calcium-nickel-phosphate catalysts cracking and coke-formation take place, in addition to the main reaction. Reduction of the catalyst by the reaction medium increases the rate of secondary reactions and reduces diene yield in dehydrogenation of butylenes, which is due to the formation of zero-valent nickel on the surface of calcium-nickel phosphate catalyst. It was found possible in a number of studies to effect transition of Ni/sup 2 +/ ..-->.. Ni/sup 0/ during treatment of the catalyst with hydrogen. It may be assumed from these studies that to suppress cracking and coke-formation, it is necessary to introduce into the catalyst modifying additives, which prevent the reduction of bivalent nickel or block the reduced nickel. When studying dehydrogenation of cyclohexane on nickel catalysts it was found that the addition to the catalyst of zinc oxide and non-transition metal oxides results in the suppression of hydrogenolysis of cyclohexane. This paper presents results of an investigation of the transformation of cyclohexane and isoamylenes on calcium-nickel-phosphate catalysts modified by strontium and zinc cations. The effect of these modifiers on the reduction of calcium-nickel-phosphate catalysts was also studied. To compare the efficiency of modifiers, cyclohexane was dehydrogenated on alumino-nickel catalysts containing strontium and zinc cations.

• OSTI ID: 6948629
• Journal Information: Pet. Chem. USSR (Engl. Transl.); (United States), Journal Name: Pet. Chem. USSR (Engl. Transl.); (United States) Vol. 22:1; ISSN PECHA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
2-METHYLBUTANE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADDITIVES
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ALKANES
CALCIUM COMPOUNDS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CYCLOALKANES
CYCLOHEXANE
DATA
DEHYDROGENATION
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
IONS
METALS
NICKEL
NICKEL COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
REDUCTION
STRONTIUM
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZINC