02019nab a2200205 4500 20260520000904.0 260224s2010 xxu Comparative investigation on chemical looping combustion of coal-derived synthesis gas containing H2S over supported NiO oxygen carriers jul./ago. 2010 23/11/2010 ; 23/11/2010 9 p. ; 4206–4214 Transcripción del resumen del autor. Chemical looping combustion (CLC) of simulated coal-derived synthesis gas was conducted with NiO oxygen carriers supported on SiO2, ZrO2, TiO2, and sepiolite. The effect of H2S on the performance of these samples for the CLC process was also evaluated. Five-cycle thermogravimetric analysis (TGA) tests at 800 °C indicated that all oxygen carriers had a stable performance at 800 °C, except NiO/SiO2. Full reduction/oxidation reactions of the oxygen carrier were obtained during the five-cycle test. It was found that support had a significant effect on reaction performance of NiO both in reduction and oxidation rates. The reduction reaction was significantly faster than the oxidation reaction for all oxygen carriers, while the oxidation reaction is fairly slow due to oxygen diffusion on NiO layers. The reaction profile was greatly affected by the presence of H2S, but there was no effect on the capacity due to the presence of H2S in synthesis gas. The presence of H2S decreased reduction reaction rates significantly, but oxidation rates of reduced samples increased. X-ray diffraction (XRD) data of the oxidized samples after a five-cycle test showed stable crystalline phases without any formation of sulfides or sulfites/sulfates. Increase in reaction temperature to 900 °C had a positive effect on the performance. 4 Energy & fuels 24 ARTICULO Ksepko, Ewelina 43797 Siriwardane, Ranjani V. 36889 Tian, Hanjing 42744 172051 172051 0 0 0 0 239870 BAAB BAAB 2026-03-05 200050021 0 200050021 2026-03-05 16:07:48 2026-03-05 ARTICULO