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- W1483587793 abstract "In the oxidative coupling of methane to ethane, ethylene, and minor amounts of higher hydrocarbons (i.e., C2+ hydrocarbons) a large variety of solid metal oxide materials has been applied as catalysts; they may be loosely categorized as reducible and nonreducible ones. Only the former solids can be applied in the redox type of operation: Methane and oxygen are intermittently passed over the solid; first, methane reacts with the reducible oxide (“reagent”), which also catalyzes the desired reaction, and then the reduced metal oxide is reoxidized by gas-phase oxygen (cf., e.g., Keller and Bhasin 1982). Both types of catalysts, however, can be applied in the cofeed method in which the oxidant (most commonly oxygen) and methane flow simultaneously through the bed of solid material acting as the catalyst (Hinsen and Baerns 1982, 1983, 1986). Already in the early stages of the research on oxidative methane coupling it became apparent that doping reducible metal oxides, for example, alumina-supported PbO, with alkali compounds, or applying alkali and alkaline-earths compounds of high basicity as well as their mixtures as catalysts, or using supports of different acidity and basicity, respectively, affect the selectivity of the oxidative coupling reaction (Hinsen, Bytyn, and Baerns 1985; Baerns and Bytyn 1984; Ito and Lunsford 1985; Ito et al. 1985; Otsuka, Jinno, and Morikawa 1985; Baerns, Carreiro, and Bytyn 1985; Carreiro and Baerns 1989a, 1989b). As a general rule it has been observed that decreasing acidity and/or increasing basicity of the catalyst improves C2+ selectivity and reduces the formation of the undesired carbon oxides. The present contribution deals with these experimental findings, their interpretations, and some preliminary conclusions that might be derived from these results with respect to the catalysis of the reaction and to further catalyst improvement." @default.
- W1483587793 created "2016-06-24" @default.
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- W1483587793 date "1992-01-01" @default.
- W1483587793 modified "2023-09-26" @default.
- W1483587793 title "Basic Solids as Catalysts for the Oxidative Coupling of Methane" @default.
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- W1483587793 doi "https://doi.org/10.1007/978-94-015-7449-5_11" @default.
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