CaxLa1鈥?i>xMn1鈥?i>yMyO3鈭捨?/sub> (M = Mg, Ti, Fe, or Cu) as Oxygen Carriers for Chemical-Looping with Oxygen Uncoupling (CLOU)

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• 作者：Mehdi Arjmand ; Ali Hedayati ; Abdul-Majeed Azad ; Henrik Leion ; Magnus Ryd茅n ; Tobias Mattisson
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：August 15, 2013
• 年：2013
• 卷：27
• 期：8
• 页码：4097-4107
• 全文大小：604K
• 年卷期：v.27,no.8(August 15, 2013)
• ISSN：1520-5029

文摘

Perovskite materials of the type Ca<sub>xsub>La<sub>1鈥?i>xsub>Mn<sub>1鈥?i>ysub>M<sub>ysub>O<sub>3鈭捨?/sub> (M = Mg, Ti, Fe, or Cu) have been investigated as oxygen carriers for the chemical-looping with oxygen uncoupling (CLOU) process. The oxygen carrier particles were produced by mechanical homogenization of primary solids in a rotary evaporator, followed by extrusion and calcination at 1300 掳C for 6 h. The chemical-looping characteristics of the substituted perovskites developed in this work were evaluated in a laboratory-scale fluidized-bed reactor in the temperature range of 900鈥?000 掳C during alternating reducing and oxidizing conditions. The oxygen carriers showed oxygen releasing behavior (CLOU) in an inert atmosphere between 900 and 1000 掳C. In addition, their reactivity with methane was high, approaching complete gas yield for all of the materials at 950 掳C, with the exception being the Cu-doped perovskite, which defluidized during reduction. The rates of oxygen release were also investigated using devolatilized wood char as solid fuel and were found to be similar. The required solids inventory in the fuel reactor for the perovskite oxygen carriers is estimated to be 325 kg/MW<sub>thsub>. All of the formulations exhibited high rates of oxidation and a high degree of stability, with no particle fragmentation or agglomeration. The high reactivity and favorable oxygen uncoupling properties make these oxygen carriers promising candidates for the CLOU process.