Co_(3)O_(4)as an efficient passive NO_(x) adsorber for emission control during cold-start of diesel engines  

作　　者：Jinhuang Cai Shijie Hao Yun Zhang Xiaomin Wu Zhenguo Li Huawang Zhao 

机构地区：[1]Department of Environmental Science&Engineering,College of Chemical Engineering,Huaqiao University,Xiamen 361021,China [2]Wuxi Weifu Environmental Catalysts Co.,Ltd,Wuxi 214000,China [3]National Engineering Laboratory for Mobile Source Emission Control Technology,China Automotive Technology&Research Center Co.,Ltd.,Tianjin 300300,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第2期1-7,共7页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(22006044,22006043);External Cooperation Program of Science and Technology Planning of Fujian Province(2023I0018);the Fujian Province Science and Technology Program Funds(2020H6013);the National Engineering Laboratory for Mobile Source Emission Control Technology(NELMS2020A03);the Scientific Research Funds of Huaqiao University(605-50Y200270001)。

摘　　要：The Co_(3)O_(4)nanoparticles,dominated by a catalytically active(110)lattice plane,were synthesized as a low-temperature NO_(x) adsorbent to control the cold start emissions from vehicles.These nanoparticles boast a substantial quantity of active chemisorbed oxygen and lattice oxygen,which exhibited a NO_(x) uptake capacity commensurate with Pd/SSZ-13 at 100℃.The primary NO_(x) release temperature falls within a temperature range of 200-350℃,making it perfectly suitable for diesel engines.The characterization results demonstrate that chemisorbed oxygen facilitate nitro/nitrites intermediates formation,contributing to the NO_(x) storage at 100℃,while the nitrites begin to decompose within the 150-200℃range.Fortunately,lattice oxygen likely becomes involved in the activation of nitrites into more stable nitrate within this particular temperature range.The concurrent processes of nitrites decomposition and its conversion to nitrates results in a minimal NO_(x) release between the temperatures of 150-200℃.The nitrate formed via lattice oxygen mainly induces the NO_(x) to be released as NO_(2) within a temperature range of 200-350℃,which is advantageous in enhancing the NO_(x) activity of downstream NH_(3)-SCR catalysts,by boosting the fast SCR reaction pathway.Thanks to its low cost,considerable NO_(x) absorption capacity,and optimal release temperature,Co_(3)O_(4)demonstrates potential as an effective material for passive NO_(x) adsorber applications.

关 键 词：Emission control COLD-START Low-temperature adsorption Co_(3)O_(4) Nitrate formation 

分 类 号：TQ424[化学工程] X701[环境科学与工程—环境工程]