Thermodynamic evaluation during the reduction of MWO4 (M = Fe, Mn, Ni) with methane for the production of hydrogen-syngas

NiO / Sr doped Ce0.85Pr0.10 Er0.05O2-δ mesoarchitectured catalyst for partial oxidation of CH4 and anode fueled by H2

“…Structural evaluation by XRD and Raman spectroscopy revealed a mainly cubic fluorite phase with some traces of Pr2O3 and Sr cerates. The textural assessment confirmed the formation of the mesoporous structures at 900 • C with the average pore size in the range (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) nm. The XPS investigation on surface chemistry reveals the presence of Er 3+ , Pr 3+ oxidation states in the ceria containing only Ce 4+ ions, leading to oxygen vacancies and enhancing the oxygen mobility.…”

“…For the total conversion of CH4, high temperatures (>750 • C) [19] are required to achieve high selectivity to CO. During last years, different strategies have been followed to reduce the operation temperature by the using different heterogenous catalysts. For instance, transition metals like Ni, Co and Fe, perovskites or noble metals are widely studied [15,16,20,21]. Zhao et al [22] optimized a Ni-CeAl2O3-Al2O3/FeCrAl-fiber catalyst with enhanced carbon tolerance for the catalytic oxy-methane reforming (COMR).…”

Reduction and oxidation kinetics of NiWO4 as an oxygen carrier for hydrogen storage by a chemical looping process

“…At this stage, it is important to notice that metallic Ni is not thermodynamically possible to be oxidized with steam towards NiO. 47 Furthermore, Fig. 3(d) shows the XRD pattern of the sample after being exposed to seventeen redox cycles in a TGA ( Fig.…”

“…While reaction (3) was reported by Ahmed et al , 46 reaction (4) is proposed in the present research. According to recent studies by Lopez-Ortiz et al , 47 who performed a thermodynamic analysis on NiWO 4 , it was determined this material is able to react in a methane-steam redox cycle at a temperature range of 700–1000 °C. Furthermore, it is quite remarkable that the theoretical VSD of this material is 496 g L −1 .…”

Selection of Desulfurizer and Control of Reaction Products on Flue-Gas Desulfurization Using Chemical-Looping Technology

“…11 Lopez-Ortiz et al employed thermodynamic analysis using HSC Chemistry software to find reaction temperatures between cobalt tungstate and methane, and feasible reaction products at equilibrium state were formed in the studied condition. 75 Jerndal et al performed the thermal analysis using HSC Chemistry 5.0 software to simulate reactions of numerous oxygen carriers for chemical looping combustion. The result showed the metal oxides of copper, manganese, and iron could convert the fuel gas completely.…”