Study of Coke Deposition on Ni Catalysts for Methane Reforming to Syngas

In this paper, the recent research progresses in carbon deposition on the Ni catalysts for conversion of CH4 to synthesis gas has been summarized. The thermodynamics, kinetics and type of coke, the mechanism of carbon deposition, and the impact factors of coke formation are discussed. The effects of nickel particles size, the alkali strength degree and redox properties of supports, the interaction between nickel and supports to the amount and the type of coke deposition have been substantially analyzed. By using modern characterization measures, the mechanism, type, and amount of carbon deposition in this methane reforming reaction and elements which influence the carbon deposition are reviewed in detail, which can provide a theoretical basis for the design and development of resistance to coke properties of nickel catalyst. The well anti-coke performance catalyst can be prepared by enhancing the interaction between Ni and supports, improving the degree of dispersion of Ni on the carrier, reducing the size of Ni particles (less than 20 nm). Less amount of coke formation can be achieved by using fluidized bed reactor than fixed bed, optimizing the process parameters, and seeking for the effective regeneration method of used carbon deposition catalyst.