Presentation Information
[2B13]Low-temperature catalytic chemical looping dry reforming of methane over Ru/La2Ce2O7
○Naoki Kayama1, Keke Kang1, Takuma Higo1, Clarence Sampson1, Yasushi Sekine1 (1. Waseda Univ.)
Keywords:
Chemical looping,Methane dry reforming,Ru catalyst
Chemical looping dry reforming of methane (DRCL) is a promising method that utilizes the two major carbon-based greenhouse gases, methane and carbon monoxide, producing syngas which can be applied to produce an alternative to fuel. Ruthenium has the potential as a suitable promoter for the activation of methane. Moreover, La2Ce2O7 has shown a great performance at the oxidation step. Screening of different ruthenium doping amounts by weight has revealed that 0.5wt% and 1wt% doping of ruthenium were the most effective, with around 65% CH4 conversion with little CO2 and 95% CO2 conversion at 925 K. TPR test suggested that the reaction onset temperature was at 545 K. The stability test showed stable reactivity due to its efficient Boudouard reaction that removes the deposited carbon on the catalyst and regeneration of oxygen carrier support. The overall great performance is ascribed to the strong metal-support interaction (SMSI) effect between the oxygen carrier and the doped metal, resulting in Ru-O-Ce bonds at the interface. SMSI effect acts on fixing the ruthenium particles on the La2Ce2O7 surface and provides the stability of the system. In addition, these Ru-O-Ce bonds foster ionic conduction and, thus, enhance the methane reactivity.