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On the basis of the characterization of typical catalysts by activityevaluation,TPR,XRD and TEM,the effects of nickel content and promoterssuch as MgO,La_2O_3,and MnO_2 were discussed.Formation of MgNiO_2 by thecombination of promoter MgO with NiO increases the catalyst stability.Promot-er La_2O_3 is found well-distributed on the catalyst surface in the form of La_2O_3without any interaction with uther components.With physically scattering ef-fect,La_2O_3 can prohibit active component Ni from sintreing at high temperatureand then improve its thermal stability.It also affects the catalyst activity andreducibility.Introduction of La_2O_3 decreases the content of small Ni crystallite,and is helpful to the prohibition of carbon deposition.A new Ni-based town gasmethanation catalyst of low Ni content with high activity and high carbon depo-sition resistance is successfully developed in the laboratory.
On the basis of the characterization of typical catalysts by activity evaluation, TPR, XRD and TEM, the effects of nickel content and promoters as MgO, La 2 O 3, and MnO 2 were discussed. Formation of MgNiO 2 by thecombination of promoter MgO with NiO increases the catalyst stability. Promoter Er 2 O 3 is found to be well-distributed on the catalyst surface in the form of La_2O_3without any interaction with uther components. Wrap physically scattering ef-fect, La_2O_3 can prohibit active component Ni from sintreing at high temperatureand then improve its thermal stability. affects the catalyst activity and predisibility. Introduction of La 2 O 3 decreases the content of small Ni crystallite, and is helpful to the prohibition of carbon deposition. A new Ni-based town gasmethanation catalyst of low Ni content with high activity and high carbon depo-sition resistance is successfully developed in the laboratory.