在表面形貌控制增强铁基载氧体Fe_2O_3(104)化学链燃烧反应活性研究的基础上,进一步研究了TiO_2,ZrO_2载体协同作用下Fe_2O_3(104)与CO化学链燃烧的反应特性.采用X射线衍射(XRD),扫描电子显微镜(SEM)和比表面积(BET)等方法对所制备的载...在表面形貌控制增强铁基载氧体Fe_2O_3(104)化学链燃烧反应活性研究的基础上,进一步研究了TiO_2,ZrO_2载体协同作用下Fe_2O_3(104)与CO化学链燃烧的反应特性.采用X射线衍射(XRD),扫描电子显微镜(SEM)和比表面积(BET)等方法对所制备的载氧体Fe_2O_3(104)/TiO_2和Fe_2O_3(104)/ZrO_2进行表征.研究了700,800和900℃下载氧体与CO化学链燃烧反应特性.结果表明,不同载体对Fe_2O_3(104)与CO发生化学链燃烧反应活性的影响程度不同,ZrO_2作为载体明显促进Fe_2O_3(104)与CO的反应速率.动力学分析结果显示,Fe_2O_3(104)/TiO_2与CO反应模型属于一级反应,反应活化能为153.6 k J/mol;Fe_2O_3(104)/ZrO_2与CO反应模型属于抽缩球体模型,反应活化能为118.9 k J/mol.展开更多
Two-step steam reforming of methane (SRM) is a novel chemical looping process towards the production of pure hydrogen and syngas (synthesis gas), consisting of a syngas production step and a water-splitting step. Rene...Two-step steam reforming of methane (SRM) is a novel chemical looping process towards the production of pure hydrogen and syngas (synthesis gas), consisting of a syngas production step and a water-splitting step. Renewable energy can be used to drive this process for hydrogen production, especially solar energy. CeO2-Fe2O3 complex oxide oxygen carrier was prepared by the impregnation method and characterized by means of X-ray diffractometer (XRD), Raman spectroscopy (Raman) and hydrogen programmed reduction (H2-TPR). CH4 temperature programmed and isothermal reactions were adopted to test syngas production reactivity, and water splitting reaction was employed to investigate water-splitting activity. Moreover, two-step SRM performance was evaluated by a successive redox cycle. The results showed that CO-uncontaminated H2 and highly selective syngas (with H2/CO ratio close to 2) could be respectively obtained from two steps, and CeFeO3 formation was found in the first redox cycle and proved to be enhanced by the redox treatment. After 10 successive cycles, obvious CeFeO3 phase was detected, which may be responsible for favorable successive redox cycle performances.展开更多
文摘在表面形貌控制增强铁基载氧体Fe_2O_3(104)化学链燃烧反应活性研究的基础上,进一步研究了TiO_2,ZrO_2载体协同作用下Fe_2O_3(104)与CO化学链燃烧的反应特性.采用X射线衍射(XRD),扫描电子显微镜(SEM)和比表面积(BET)等方法对所制备的载氧体Fe_2O_3(104)/TiO_2和Fe_2O_3(104)/ZrO_2进行表征.研究了700,800和900℃下载氧体与CO化学链燃烧反应特性.结果表明,不同载体对Fe_2O_3(104)与CO发生化学链燃烧反应活性的影响程度不同,ZrO_2作为载体明显促进Fe_2O_3(104)与CO的反应速率.动力学分析结果显示,Fe_2O_3(104)/TiO_2与CO反应模型属于一级反应,反应活化能为153.6 k J/mol;Fe_2O_3(104)/ZrO_2与CO反应模型属于抽缩球体模型,反应活化能为118.9 k J/mol.
基金Project support by the National Natural Science Foundation of China (50574046, 50774038)the Natural Science Foundation of Yunnan Prov-ince (2008E030M)+1 种基金the Research Fund for the Doctoral Program of Higher Education of China (20095314120005)2010 Innovation Fund of Kunming University of Science and Technology
文摘Two-step steam reforming of methane (SRM) is a novel chemical looping process towards the production of pure hydrogen and syngas (synthesis gas), consisting of a syngas production step and a water-splitting step. Renewable energy can be used to drive this process for hydrogen production, especially solar energy. CeO2-Fe2O3 complex oxide oxygen carrier was prepared by the impregnation method and characterized by means of X-ray diffractometer (XRD), Raman spectroscopy (Raman) and hydrogen programmed reduction (H2-TPR). CH4 temperature programmed and isothermal reactions were adopted to test syngas production reactivity, and water splitting reaction was employed to investigate water-splitting activity. Moreover, two-step SRM performance was evaluated by a successive redox cycle. The results showed that CO-uncontaminated H2 and highly selective syngas (with H2/CO ratio close to 2) could be respectively obtained from two steps, and CeFeO3 formation was found in the first redox cycle and proved to be enhanced by the redox treatment. After 10 successive cycles, obvious CeFeO3 phase was detected, which may be responsible for favorable successive redox cycle performances.