Green rusts-derived iron oxide nanostructures catalyze NO reduction by CO  

作　　者：Ping Wang Xiaoling Mou Yong Li Wenjie Shen 

机构地区：[1]Hangzhou Institute of Advanced Studies,Zhejiang Normal University,Hangzhou,311231,China [2]State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian,116023,China

出　　处：《Green Energy & Environment》2023年第2期499-508,共10页绿色能源与环境（英文版）

基　　金：Zhejiang Normal University for providing the financial support(YS304320035)。

摘　　要：Green rusts with brucite-like layers of hydroxide intercalated with anions constitute a family of diverse precursors for the synthesis of iron oxides via dehydration,but precise structural control of the resulting oxides with respect to the size and shape at the nanometer level remains challenging due to the easy oxidation of the ferrous species.Herein,we report a new synthetic strategy for the facile preparation of fibrous-like green rusts by using appropriate balancing anions(CO_(3)^(2-)and SO_(4)^(2-))in ethylene glycol to regulate the morphology.Depending on the type of the intercalating anion,the green rusts were converted into hematite with fibrous-or plate-like shapes upon thermal activation.When evaluated in the reaction of NO reduction by CO,these iron oxides showed a prominent shape-dependent catalytic behavior.The fibrous-like Fe_(2)O_(3)was much more catalytically active and structurally robust than the plate-like analogue.Combined spectroscopic and microscopic characterizations on the nanostructured iron oxides revealed that the superior performance of the fibrous-like Fe_(2)O_(3)stemmed from a facile Fe_(2)O_(3)/Fe_(3)O_(4)redox cycle and a higher density of active sites for NO activation.

关 键 词：Green rust HEMATITE MORPHOLOGY NO reduction by CO Redox cycle 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]