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The selective catalytic reduction (SCR) of NO x with ammonia is an effective method to remove NO x from stationary and mobile sources. Cerium oxides (CeO x ) have been studied extensively as low-temperature SCR catalysts since they manifest prominent oxygen storage capacity in catalysis. This paper reviews the recent progress on the Ce-based catalysts for low-temperature SCR de-NO x with NH 3 , including three categories, single CeO x , Ce-based multimetal oxide, and Ce-based multimetal oxides with support. In the section on single CeO x , the reasons for the significant catalytic activity and the function of CeO x in the catalytic reactions are systematically reviewed. For multimetal oxide catalysts, the various roles played by the components of catalysts are summarized from several aspects. In the introduction of supported metal oxide catalysts, according to the type of support, the function of each support in the reaction is analyzed methodically. Additionally, we investigated the reaction mechanism of lowtemperature SCR of NO x , including Eley−Rideal (E−R) and Langmuir−Hinshelwood (L−H) mechanisms. Finally, the development outlook and direction of the application of cerium oxide-based catalysts in the field of low-temperature SCR of NO x is prospected.

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A Z-scheme Bi2O2CO3/Bi/NiAl-LDH (BBOC/LDH) nanosheet heterojunction was fabricated by a hydrothermal method. The BBOC/LDH composites exhibited superior performance for photocatalytic CO2 reduction. A maximum yield of CH4 with the value of 56.64 μmol/gcat was achieved on 20%BBOC/LDH composite, which was 3.9-fold higher than pure LDH. The larger specific surface area, and the efficient separation of photoexcited electrons and holes attributed to the metal Bi SPR effect and Z-scheme heterojunction, enhanced the CO2 photoreduction performance.