Abstract：In order to solve the problem of catalyst which was easy to deposit carbon during dry reforming of methane, a series of CoxSnyNi7.5-x-yMg92.5O catalyst were prepared using CoxSnyNi7.5-x-yMg92.5(OH)(OCH3) as single precursor by methanol solvothermal method. The anti-deposit performance and reaction kinetics of the catalysts were studied. The double auxiliary effect of Co and Sn and their anti-deposit performance were also discussed. The results showed that Co0.075SnxNi7.425-xMg92.5O catalysts could keep high activity and stability length out to 100 hours. The kinetic study showed that the reforming reaction of CH4 and CO2 is the first-order reaction of CH4 and the zero-order reaction of CO2. For the different composition of Co0.075SnxNi7.425-xMg92.5O catalysts, Co could reduce the activation energy of the reaction and Sn could increase the activation energy of the reaction. For the double auxiliary effect of Co and Sn, it was found that: 1. Sn could reduce the rate of methane cracking and carbon deposition, and Co could increase the gasification rate of carbon species on the catalyst surface. 2. The introduction of Co and Sn could significantly reduce the content of gasified carbon and refractory carbon at the same time. Therefore, Co and Sn catalysts have great potential value for the design and application of CH4-CO2 reforming catalyst.
ZHANG Tingting,LIU Zhongxian,ZHU Kake et al. Study on Coke-Resistance and Kinetics of CH4-CO2 Dry Reforming on CoxSnyNi7.5-x-yMg92.5O Catalysts[J]. 化学反应工程与工艺, 2019, 35(4): 289-295.
