Dry Reforming With CO₂Over TaskerⅢ MgO （111） Supported Ni Catalysts

Compared to the steam reforming of methane, CO2reforming provides lower energy consumption, a lower H2/CO ratio, and a higher CO selectivity. However, the stability and anti-carbon deposition performance of catalyst is a crucial problem at high temperature. In present it does not take into account that the crystal surface structure may affect the activity and anti-carbon deposition performance of the catalyst. There has been strong interaction between Ni particle and the carrier on (111) surface to prevent its growth. In addition, the alkaline basicity can absorb a large number of CO2to oxidize the carbon formed in the reaction. Thus, we contribute a unique bottom-up approach to synthesize NixMg1-xO-plate and Ni0.1X0.01Mg0.9O (X=Ce、Co、Sn、Mn) catalysts. We also investigate these catalysts’ anti-coking property and effect of the promoters in this system. The main results as follows:(1) A unique method can prepare NixMg1-xO-plate solid solutions that is covered by polar (111) surfaces. Both nickel and magnesium are found be to homogeneously distributed among the sample.(2) The catalytic dry reforming of CH4and CO2was conducted over reduced NixMg1-xO-plate. The reduced NixMg1-xO-plate solid solutions are stable towards methane dry reforming of carbon dioxide. During the course of the100hr test, CH4conversion for Ni0.0sMg0.95O-platelet decreases from an initial44.9%to41.9%at75hrs and stabilizes at this value later on, whereas a slow but continuous declination in activity are observed for conventionally synthesized Ni0.05Mg0.95O-con.(3) We can also use the unique method can prepare Ni0.10X0.01Mg0.90O (x=Ce、Co、Sn、 Mn) catalysts. All the metals are found to be homogeneously distributed among the sample.(4) The catalytic dry reforming of CH4and CO2was conducted over reduced Ni0.10X0.01Mg0.90O (x=Ce、Co、Sn、Mn) catalysts. It has been observed that the M-Ni0.10Mg0.90O is more stable than Ni0.10Mg0.90O. But the effects of the promoters on the activities are different. The conversion of the Ce-and Co-Ni0.10Mgo.90O catalysts has not remarkably changed. But the addition of Sn and Mn affect the CH4conversion more remarkably. (5) Promoters (Ce、Co、Sn、Mn) can improved stability of Ni0.10Mg0.90O, because the promoted metals can decrease the froming of C-(3.