| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 106 === As the extration of shale gas and discovery of methane ice and hydrogen is promosing energy carrier in near future, producing hygrogen from methane deserves to be gained increasing attention. Nickel-based catalysts have been extensively investigated for methane reaction but the catalytic mechanism is still a debate. In this study, nickel supported on LaZrCeOx was used to do methane reaction by changing the catalyst synthesis parameter and reaction condition. The result shows that even using different systhesis method (coprecipitation, combustion) but control metal oxide ratio to La:Zr:Ce = 1:1:1 (mole), Ni/LZC have good activity in SRM, then we change the co reactant form water to carbon dioxide do dry reforming, which retains a good stability operating continuously up to 100 hours and the catalyst characteristic with different onstream time would. Kinetic analyst result show that CH4 with the different co-reactant would influence the rate determining step. We further examine the DRM using a looping operation. The result show that CH4 pyrolysis and reverse boudouard reaction occur, respectively, in the two-step operation and the CO2 regeneration at 973K can effectively restore the initial methane pyrolysis activity and also prolong the catalyst life, speculating the extension of catalyst life due to the change of carbon formation mechanism.
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