Reforming of Methane with Carbon Dioxide to Synthesis Gas over Supported Rhodium Catalysts: I. Effects of Support and Metal Crystallite Size on Reaction Activity and Deactivation Characteristics

摘要: The effects of carrier and metal particle size on the catalytic performance (initial intrinsic activity deactivation characteristics) Rh in reaction reforming methane with carbon dioxide were investigated. specific catalysts was found to strongly depend employed disperse metal, decreasing order yttria-stabilized zirconia (YSZ) > Al2O3> TiO2> SiO2> La2O3> MgO, a result which correlates directly acidity characteristics carrier. initial rate also be sensitive size, range 1 ∼ 6 nm. Both decrease increasing size. However, degree these dependences largely affected by nature carrier, suggesting that dependence is likely related metal–support interactions. While relatively high rates observed over supported TiO2and lower YSZ, Al2O3, La2O3, SiO2. Evidence at least three kinds factors contribute catalyst deactivation, namely, deposition, sintering, poisoning surface sites species originating from importance each determined