Cataytic perofrmance and anaysis of carbon deposition in the production of synthesis gas by methane reforming with carbon dioxide -development of NiO-MgO solid solution catalysts-

摘要

Natural gas often contais considerable amounts of CO-2,and CO_2 reforming of methane is an effective emthod for the utilization of CH_4 and CO_2.Methane reforming with CO_2 produces synthesis gas with H_2/CO=1 from its stoichiometry.The composition of the synthesis gas can be changed by H_2O addition in the range of H_2/CO=3/1-1/1.However,carbon depositionis the problem in te reforming of methane with carbon dioxide.We have developed a catalyst with igh carbon dioxide.We have develoepd a catalytic perofrmance and carbon deposition behavior in methane reforming reaction under atmospheric and high pressurie conditions were investigated over NiO-MgO solid solution catalyst.Ni_(0.03)Mg_(0.97)O with highsurface area exhibited very high resistance to carbon deposition during methane reforming under atmospheric pressure.This resistance amy be due to CO_2 activation on the interface betweent eh metal particles and support surface.However,serious carbon deposition was observed under high pressure conditions.Carbon deposition was more effectively decreased on the NiO-MgO solid solutio catlayst with low surface area.The modification effect of Sn,Ge,and Ca were also investigated.Addition of Sn was very effective toinhibit carbon formation via methane decomposition.in addition,the fluidized bed reactor using NiO-MgO solid solutions is vry effective for the syngas production bymethane reforming with the internal heat supply.