Abstract The sorption enhanced chemical looping gasification (SECLG) of rice husk (RH) with NixCa1−xO particles was studied in this work. NixCa1−xO particles were prepared by the sol-gel method. The experimental results showed that the ratio of Ni/Ca in NixCa1−xO had a great effect on the SECLG of RH. NixCa1−xO in a Ni/Ca ratio of 1 exhibited the best catalytic activity for the production of H2 and CO. The SECLG process could be interpreted by a sorption enhanced in situ reduction reaction mechanism, showing that Ni was the real active center for SECLG of RH to hydrogen. NiO was firstly reduced by CO released from SECLG of RH to Ni metal with a side product of CO2, and CO2 reacted with CaO to form CaCO3. These coupled reactions significantly enhanced the generation rate of metallic Ni, the real catalytic active center, which accelerated the reaction rate.

中文翻译：

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多功能Ni Ca1−O颗粒对生物质废弃物稻壳吸附增强化学循环气化制氢还原机理研究

摘要 本工作研究了 NixCa1−xO 颗粒对稻壳 (RH) 的吸附增强化学循环气化 (SECLG)。NixCa1-xO 颗粒通过溶胶-凝胶法制备。实验结果表明 NixCa1−xO 中 Ni/Ca 的比例对 RH 的 SECLG 有很大影响。Ni/Ca 比为 1 的 NixCa1−xO 对 H2 和 CO 的产生表现出最好的催化活性。 SECLG 过程可以通过吸附增强的原位还原反应机制来解释，表明 Ni 是 SECLG 的真正活性中心RH 到氢气。NiO首先被RH的SECLG释放的CO还原为Ni金属，副产物为CO2，CO2与CaO反应生成CaCO3。这些耦合反应显着提高了真正的催化活性中心金属 Ni 的生成率，