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A superior catalyst for ozone decomposition: NiFe layered double hydroxide
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作者 Zhisheng Wang yingfa chen +3 位作者 Xiaotong Li Jinzhu Ma Guangzhi He Hong He 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2023年第12期2-10,共9页
Ground-level ozone is harmful to human beings and ecosystems,while room-temperature catalytic decomposition is the most effective technology for ozone abatement.However,solving the deactivation of existing metal oxide... Ground-level ozone is harmful to human beings and ecosystems,while room-temperature catalytic decomposition is the most effective technology for ozone abatement.However,solving the deactivation of existing metal oxide catalysts was caused by oxygen-containing intermediates is challenging.Here,we successfully prepared a two-dimensional NiFe layered double hydroxide (NiFe-LDH) catalyst via a facile co-precipitation method,which exhibited stable and highly efficient performance of ozone decomposition under harsh operating conditions (high space velocity and humidity).The NiFe-LDH catalyst with Ni/Fe=3and crystallization time over 5 hr (named Ni3Fe-5) exhibited the best catalytic performance,which was well beyond that of most existing manganese-based oxide catalysts.Specifically,under relative humidity of 65%and space velocity of 840 L/(g·hr),Ni3Fe-5 showed ozone conversion of 89%and 76%for 40 ppmV of O3within 6 and 168 hr at room-temperature,respectively.We demonstrated that the layered structure of NiFe-LDH played a decisive role in its outstanding catalytic performance in terms of both activity and water resistance.The LDH catalysts fundamentally avoids the deactivation caused by the occupancy of oxygen vacancies by oxygen-containing species (H2O,O-,and O2-) in manganese-based oxide.This study indicated the promising application potential of LDHs than manganese-based oxide catalysts in removal of gaseous ozone. 展开更多
关键词 Ozone decomposition Confined catalysis Nickel-iron layered double HYDROXIDES Co-precipitation method Two-dimensional materials
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