Solar Upgrade of Methane Using Dry Reforming In Direct Contact Bubble Reactor

摘要: The reforming behavior of a direct contact bubbling CH4-CO2 mixture, was quantitatively investigated, in an alkali carbonate based molten salt system containing suspended Ni-Al2O3 catalyst. A thermodynamical process solar reformer dry methane proposed to operate temperature range 600-800oC. selectivity the thermal fluid have been validated according specific requirements including lower melting point, and chemical stability, acting simultaneously as heat transport sensible storage. ternary mixture carbonates Na2CO3, K2CO3 Li2CO3 ratio 1:2:2 fulfills our for bubble reactor reformer, which CO2-rich reformed produce synthesis gas. experimentally investigated quantify product compositions, pursuing maximize conversion H2 yield, while minimizing coke depositions carbonization effects. Three types Ni-loading (10%, 15% & 20 wt. %) - Al2O3 catalysts were prepared by impregnation using nickel nitrate solution. results exhibited that 15%Ni-Al2O3 catalyst showed highest activity with respect % yield (or H2:CO production ratio) carbon deposition rates. thermodynamic analysis positive effect excess CO2 on CH4 salts; higher CO2/CH4 ratio, reaction can be achieved; subsequently, decomposition carbonates. However, experimental expressed increase terms conversion, whereas significantly decreasing, attributed water formation result Reverse Water Gas Shift (RWGS) reaction. While, is decreasing per theoretical results.