Primary reaction steps and active surface sites in the rhodium-catalyzed partial oxidation of methane to CO and H 2

摘要: The nature of surface sites responsible for methane activation and COx formation on Rh catalysts the partial oxidation to syngas was investigated. interaction H4 with Rh-black after oxidative reductive pretreatments studied applying (a) pulse experiments at reduced total pressure (10−4 Pa) 1013 K in temporal-analysis-of-product (TAP) reactor (b) situ DRIFTS 973 K. saturation metal oxygen found inhibit dissociation. Direct CO2 oxidized proposed earlier excluded. Methane is first dissociated sites; carbon species formed, then, react CO2. are neither related Rh2O3 nor Rh0. Probably partially (Rh+) or highly dispersed Rh3+ entities act as active centers dissociation methane. For supported catalyst, such stabilized by support, which other side acts a source involved hydrogen.