An oxygen carrier catalyst toward efficient chemical looping-oxidative coupling of methane
Sun, Weidong 1Zhao, Guofeng 1Gao, Ya 1Si, Jiaqi 1Liu, Ye 1Lu, Yong1
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作者信息
1. East China Normal Univ
折叠
Abstract
Chemical looping concept paves way toward intrinsically safe and efficient oxidative coupling of methane (CL-OCM) process, because it permits the reaction to proceed via repeating reduction-oxidation cycle in two reactors. It is calling for a ground-breaking catalyst with enough high selective CH4-converting lattice-oxygen carrying capacity but represents a grand challenge. Herein, we report an efficient catalyst obtainable by decorating an oxygen carrier FeMnO3 with Na2WO4, with good cycling performance, achieving a high space time yield of 29.8 g(C2-C3) kg(cat)(-1) h(-1) with 20% CH4 conversion and 80% C-2-C-3 selectivity at 800 degrees C and a low catalyst/CH4 weight ratio of 13.5. CL-OCM process is established by "FeMnO3. [MnFe2O4 + MnO]" redox cycle. Na2WO4-decoration gets lattice oxygen stored in FeMnO3 transformed from non-selective to selective due to mitigation of latticeoxygen evolution. Scaled up CL-OCM testing with 10-gram catalyst also yields comparable results seen in the case of using 1-gram catalyst, validating great application potential.
Key words
Chemical looping/Oxidative coupling of methane/Ethylene/Oxygen carrier catalyst/Red-ox cycle/NONOXIDATIVE CONVERSION/ETHYLENE/OLEFINS/LITHIUM
NSTL
Elsevier