Thermodynamic evaluation during the reduction of MWO_4 (M = Fe, Mn, Ni) with methane for the production of hydrogen-syngas

摘要

In order to overcome one of the most important disadvantages of the partial oxidation of methane (POX) reaction, which deals with the use of pure oxygen as a gas feed, a mixed metal oxide (MWO4, M = Fe, Mn, Ni) is proposed as an oxygen carrier. The aim of this study is to evaluate the feasibility of these tungstates through the use of thermodynamic analyses and process simulations in an arrangement of two reactors. First reactor: CH4 + MWO4 = H-2 + CO + M + W; CH4 + MWO4 = H-2 + CO2 + M + W and possibly CH4 = C + 2H(2). While in the second reactor: M + W + H2O = MWO4 + H-2; C + H2O = H-2 + CO; C + 2H(2)O = 2H(2) + CO2. Then, the MWO4 is recycled back to the first reactor to make a continuous process. Simulation results of this process with the different MWO4 oxides are presented using Aspen Plus. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.