Records with Keyword: Steam Reforming
Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors
Junjie Chen, Baofang Liu, Xuhui Gao, Deguang Xu
September 21, 2018 (v1)
Keywords: catalytic combustion, Computational Fluid Dynamics, hydrogen production, Process Intensification, process optimization, Steam Reforming, thermal management, thermally integrated microchannel reactors
This paper addresses the issues related to the rapid production of hydrogen from methane steam reforming by means of process intensification. Methane steam reforming coupled with catalytic combustion in thermally integrated microchannel reactors for the production of hydrogen was investigated numerically. The effect of the catalyst, flow arrangement, and reactor dimension was assessed to optimize the design of the system. The thermal interaction between reforming and combustion was investigated for the purpose of the rapid production of hydrogen. The importance of thermal management was discussed in detail, and a theoretical analysis was made on the transport phenomena during each of the reforming and combustion processes. The results indicated that the design of a thermally integrated system operated at millisecond contact times is feasible. The design benefits from the miniaturization of the reactors, but the improvement in catalyst performance is also required to ensure the rapid pr... [more]
Effects of Catalysts and Membranes on the Performance of Membrane Reactors in Steam Reforming of Ethanol at Moderate Temperature
Manabu Miyamoto, Yuki Yoshikawa, Yasunori Oumi, Shin-ichi Yamaura, Shigeyuki Uemiya
July 30, 2018 (v1)
Keywords: amorphous alloy membranes, Ethanol, membrane reactor, Steam Reforming
Steam reforming of ethanol in the membrane reactor using the Pd77Ag23 membrane was evaluated in Ni/CeO₂ and Co/CeO₂ at atmospheric pressure. At 673 K, the H₂ yield in the Pd77Ag23 membrane reactor over Co/CeO₂ was found to be higher than that over Ni/CeO₂, although the H₂ yield over Ni/CeO₂ exceeded that over Co/CeO₂ at 773 K. This difference was owing to their reaction mechanism. At 773 K, the effect of H₂ removal could be understood as the equilibrium shift. In contrast, the H₂ removal kinetically inhibited the reverse methane steam reforming at low temperature. Thus, the low methane-forming reaction rate of Co/CeO₂ was favorable at 673 K. The addition of a trace amount of Ru increased the H₂ yield effectively in the membrane reactor, indicating that a reverse H₂ spill over mechanism of Ru would enhance the kinetical effect of H₂ separation. Finally, the effect of membrane performance on the reactor performance by using amorphous alloy membranes with different compositions was evalua... [more]
Biomass-Gas-and-Nuclear-To-Liquids Aspen Plus Simulations
Leila Hoseinzade, Thomas A. Adams II
June 12, 2018 (v1)
Aspen Plus simulation for eight different chemical processes. Each simulation corresponds to a process which convert biomass, natural gas, and in some cases, nuclear energy, into either dimethyl ether (DME) or Fischer-Tropsch liquids (synthetic gasoline and diesel). Some processes contain carbon capture and sequestration (CCS) steps.

The processes may include various technologies such as biomass gasification, steam methane reforming, integrated gasification and natural gas reforming, integrated high temperature gas-cooled reactors and natural gas reforming, water gas shift reaction, FT synthesis, DME synthesis, MEA or MDEA based carbon capture, gas combustion turbines, gas cleaning, and other processing steps. Nuclear energy, when used, is integrated into the system via a high temperature helium coolant as an energy carrier from certain kinds of Gen IV nuclear reactors.

The eight processes are: BGNTL-FT (biomass-gas-nuclear-to-liquids with FT synthesis), BGNTL-FT-CCS (the same w... [more]
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