Low-Temperature Light-off MnOx-Na2WO4-Based Catalysts: A Step Forward to OCM Process Industrialization

作者：Zhao, Guofeng^*; Ni, Jiayong; Si, Jiaqi; Sun, Weidong; Lu, Yong^*

来源：Chemphyschem : a European journal of chemical physics and physical chemistry , 2022, 23(22): e202200365.

DOI：10.1002/cphc.202200365

• oxidative coupling of methane
• heterogeneous catalysis
• redox cycle
• chemical looping
• reaction mechanism

Oxidative coupling of methane (OCM) catalyzed by MnOx-Na2WO4-based catalysts has great industrial potential to convert CH4 directly to C2-3 products, but the high light-off temperature is a big challenge to OCM commercialization. The reaction mechanism studies disclosed that O-2/CH4-activation relevant "Mn2+<-> Mn3+" redox cycle is tightly linked with the catalyst light-off. One concept is thus put forward that the OCM light-off temperature could be lowered once a "Mn2+<-> Mn3+" redox cycle was established to be triggered at low temperature over MnOx-Na2WO4-based catalysts. The relevant studies in recent years are reviewed, showing that the establishment of low-temperature light-off "Mn2+<-> Mn3+" redox cycle over the MnOx-Na2WO4-based catalysts indeed works effectively toward a low-temperature light-off OCM process. Moreover, three perspectives for the OCM industrialization are discussed based on this concept, including monolithic catalyst, fluidized-bed method and chemical-looping process.

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