期刊
JOURNAL OF CO2 UTILIZATION
卷 23, 期 -, 页码 1-9出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2017.10.022
关键词
Carbon dioxide; Hydrogen storage; Magnesium oxide catalyst; Methanation; Nickel catalyst; Power-to-gas
资金
- Austrian 'Klima- und Energiefonds'
- NAWI Graz program
Chemical hydrogen storage via conversion with carbon dioxide into methane is a promising technology in an energy system that relies on renewable energy resources. Robust heterogeneous catalysts are needed for this reaction to proceed at relevant levels. Ni/MgO is a promising catalyst in terms of activity and stability. Although several microscale catalyst studies exist, there is a lack of knowledge on catalyst performance and reactor control at larger scale for carbon dioxide methanation at ambient pressure and a technically relevant stoichiometric H-2:CO2 (4: 1) feed. Two catalysts with a loading of 11 and 17 wt.% nickel were prepared by wet impregnation, producing a Ni/MgO solid solution with a cubic lattice. Controlled increase ('scanning experiment') of the catalyst temperature to 500 degrees C for the highly exothermic CO2 methanation was compared to steady-state experiments. Scanning and steady-state experiments yield comparable results in terms of carbon dioxide conversion and methane selectivity, whereas scanning experiments lead to considerable time saving. At a moderate temperature of 325 degrees C and a feed flow consisting of H-2: CO2: N-2 = 4: 1: 5 at a flow rate of 250 cm(STP)(3)min(-1), CO2 conversion and CH4 selectivity near thermodynamic equilibrium are achievable. The long-term stability of Ni/MgO (17 wt.% Ni) at 330 degrees C was proven during reactor operation for several days.
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