NICKEL AND COBALT-CONTAINING HETEROGENEOUS CATALYSTS CARBON DIOXIDE CONVERSION OF METHANE
Emin A. Majidov, Natalya K. Andrushenko, Rovshan B. Akhverdiev, Afina A. Aliyeva, Sara K. Faradjeva, Tarana S. Latifova
Pagini: 143-150
Publicat: 1 Jan 2008
Vizualizări: 114
Rezumat: The valent and coordination condition of nickel and cobalt ions in contents of catalysts carbon dioxide conversion of methane is investigated. At their low concentration (5 % mas.), as a result of chemical processes the phase of surface mixed spinel NiAl2O4 was formed, and at big quantities (10 and 15 %) along with it surface phase of NiO was also formed. Processing of nickel containing catalysts by methane results in practically complete reduction of Ni2+ nickel ions to Ni0 (or Niδ+) and to covering of surface with coke precipitations. In CH4 mediums + air; CH4 + CO2 the oxidation reduction processes Ni2+ ↔ Ni0 with shift of balance to the right in case of processing the catalyst by mix CH4 + CO2 proceed to. In this case on a surface of catalysts oxidizing [Ni2+ (Td and Oh) in structure NiAl2O4] and reduced [Ni0 (or Niδ+)] forms of nickel coexist. Processing cobalt containing catalysts in the reactive medium practically does not affect a condition of ions Co2+ (Td) and Co2+ (Oh). On a surface of cobalt oxide catalysts within the limits of concentration of cobalt 5 and 10 % mas., a phase normal spinel and CoAl2O4 and isolated surface ions Co2+ (Oh) are available.
Cuvinte cheie: carbon dioxide, methane, conversion
Citează acest articol: Emin A. Majidov, Natalya K. Andrushenko, Rovshan B. Akhverdiev, Afina A. Aliyeva, Sara K. Faradjeva, Tarana S. Latifova. NICKEL AND COBALT-CONTAINING HETEROGENEOUS CATALYSTS CARBON DIOXIDE CONVERSION OF METHANE. Journal of International Scientific Publications: Materials, Methods & Technologies 2, 143-150 (2008). https://www.scientific-publications.net/en/article/1003526/
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