Catalytic properties of simple Cu and Ni, as well as mixed Ni-Cu and Cu-Ni, silica gels in the oxidation of hydrocarbon gases
The dependence of the activity of catalysts, which were obtained on the basis of Silica Gel KSS and contains silicate layers of copper, nickel, or copper and nickel simultaneously, on the chemical composition of the active additive, its amount, the order of the arrangement of the silicate layers and the temperature were investigated. The simple silicate compounds of copper and nickel were synthesized on the basis of Silica Gel KSS, which contains 3.4 meq of structural hydroxyl groups per gram of SiO/sub 2/, by reacting the 1-2 mm silica gel fraction with solutions of copper and nickel ammoniates. The mixed silicate compounds, Ni-Cu and Cu-Ni silica gels, were obtained as a result of the further conversion of the Ni or Cu silica gels. Catalytic activity was investigated under dynamic conditions from a mixture of illuminating gas with air in a 1:200 ratio at a temperature of 300 to 500/sup 0/C. The activity of the catalysts in the oxidation of the hydrocarbon gases was evaluated from the amount of carbon dioxide formed as a result of the oxidation reaction and was expressed as the extent of the oxidation of methane. The results show that methane and the other saturated and unsaturated hydrocarbon gases(C/sub 1/-C/sub 5/) are oxidized to CO/sub 2/ and H/sub 2/O at a temperature above 300 to 350/sup 0/C on the silicate compounds of copper and nickel investigated. A series of polysilicic compounds of nickel, whose surface was coated with layers of copper silicate was tested. Their activity also increases with increasing total concentration of the active ions. The catalytic activity of the Cu-Ni silica gels in which layer of nickel hydrosilicate are arranged in the surface of copper hydrosilicate, and a comparison with the Cu and Ni silica gels showed that mutual enhancement of the catalytic activity occurs with this sequence of the hydrosilicates. 1 figure, 3 tables.
- OSTI ID:
- 5818723
- Journal Information:
- J. Appl. Chem. USSR (Engl. Transl.); (United States), Vol. 52:2; Other Information: Translated from Zh. Prikl. Khim.; 52: No. 2, 299-303(Feb 1979)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER
CATALYTIC EFFECTS
METHANE
OXIDATION
NICKEL
CARBON DIOXIDE
CATALYSTS
FUEL-AIR RATIO
HIGH TEMPERATURE
HYDROCARBONS
SILICA GEL
WATER
ADSORBENTS
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HYDROGEN COMPOUNDS
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENTS
090110* - Hydrocarbon Fuels- Properties- (1979-1989)