Role of MgO and CaO promoters in Ni-catalyzed hydrogenation reactions of CO and carbon

摘要: Abstract The roles of Mg and Ca promoters in Ni-catalyzed hydrogasification carbon were investigated with emphasis on nickel dispersion nickel-carbon interactions during gasification. carbon, which was estimated by means XRD, H 2 -TPD, CO methanation test, (Ni + Mg)a(Ni Ca)>Ni. increased dispersions the added found to result enhanced NiC interaction, monitored through desorption from oxygen remaining and, therefore, promotions lower-temperature gasification at 400 ≈ 700°C. promoter likely give surface CaO(OOO) species upon heating up 550°C release above ≈650°C. released is efficiently converted adjacent CaO into create Ni(OC 700°C, resulting acceleration In situ transfer Ni/C reaction most important role played promoter.