Redox investigation of some oxides of transition-state metals, Ni, Cu, Fe, and Mn Supported on SiO2
Redox investigation of some oxides of transition-state metals, Ni, Cu, Fe, and Mn Supported on SiO2
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DOI：
10.1021/ef0501389
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发表时间：
2005
期刊：
影响因子：
5.3
通讯作者：
Q. Zafar;T. Mattisson;B. Gevert
中科院分区：
文献类型：
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作者：
Q. Zafar;T. Mattisson;B. Gevert
化学链燃烧（CLC）和化学链重整（CHR）涉及使用金属氧化物作为氧载体，其将氧从燃烧空气转移到燃料。两个相互连接的流化床，燃料反应器，和空气反应器中使用的两个过程。在燃料反应器中，燃料被金属氧化物氧化，在空气反应器中，还原的金属被氧化回原始相。在CLC中，在燃料反应器中需要燃料向CO2和H2O的高转化率，而在CLC中仅需要燃料的部分氧化。通过干法浸渍制备负载在SiO2和MgAl 2 O 4上的Ni、Cu、Fe和Mn的氧化物，并在800 - 1000 °C下在热重分析仪中在交替的还原和氧化条件下使用燃料（10%CH4、10%H2O和5%CO2）和氧化气体（5%O2）进行研究。NiO和CuO负载在SiO_2和MgAl_2O_4上都表现出很高的反应活性。在950 °C时，NiO/SiO2的反应活性随循环次数的增加而降低，但随循环次数的增加而降低。
Chemical-looping combustion (CLC) and chemical-looping reforming (CLR) involve the use of a metal oxide as an oxygen carrier which transfers oxygen from combustion air to the fuel. Two interconnected fluidized beds, a fuel reactor, and an air reactor are used in both processes. In the fuel reactor, the fuel is oxidized by a metal oxide, and in the air reactor, the reduced metal is oxidized back to the original phase. In CLC, a high conversion of the fuel to CO2 and H2O is required in the fuel reactor, whereas only a partial oxidation of the fuel is desired in CLR. Oxides of Ni, Cu, Fe, and Mn supported on SiO2 and MgAl2O4 were prepared by dry impregnation and investigated under alternating reducing and oxidizing conditions in a thermogravimetric analyzer at 800−1000 °C using fuel (10% CH4, 10% H2O, and 5% CO2) and oxidizing gas (5% O2). NiO and CuO supported on both SiO2 and MgAl2O4 showed very high reactivity. However, the reactivity of NiO/SiO2 decreased as a function of the cycle number at 950 °C but w...