Improved reversible redox cycles on MTiOx (M = Fe, Co, Ni, and Cu) particles afforded by rapid and stable oxygen carrier capacity for use in chemical looping combustion of methane
作者： Byeong Sub Kwak , No-Kuk Park , Si Ok Ryu , Jeom-In Baek , Ho-Jung Ryu
DOI: 10.1016/J.CEJ.2016.10.040
关键词:
摘要: Abstract In this study, rutile TiO2 particles (MTiOx) incorporating 3d-metals, with their electrons more than half-filled, are synthesized for use in the chemical looping combustion of methane. The specific structures obtained by doping M-sites Fe, Co, Ni, and Cu (FeTiOx, CoTiOx, NiTiOx, CuTiOx), they have same M/Ti molar ratio 1.0. XRD, SEM, CH4-TPD, TGA, BET techniques were used to characterize prepared materials. XRD results confirmed that all materials possessed pure hexagonal phases case Co1Ti1Ox Ni1Ti1Ox mixed formations composed metal oxides Fe1Ti1Ox Cu1Ti1Ox. CH4-TPD H2-TPR analyses showed highest adsorption is on CuTiOx, particular Cu1.5Ti1Ox. oxygen carrier capacities samples measured H2 (FR)/air (AR) CH4-CO2 redox systems at 850 °C using TGA analysis. Their variability was shown be associated different elements concentrations. particular, Cu1.5Ti1Ox material system exhibits uncoupling behaviour, leading improved capture release compared other
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