首页|Co3O4 as an efficient passive NOx adsorber for emission control during cold-start of diesel engines

Co3O4 as an efficient passive NOx adsorber for emission control during cold-start of diesel engines

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The Co3O4 nanoparticles,dominated by a catalytically active(110)lattice plane,were synthesized as a low-temperature NOx 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 NOx uptake capacity commensurate with Pd/SSZ-13 at 100 ℃.The primary NOx release temperature falls within a temperature range of 200-350 ℃,making it perfectly suitable for diesel engines.The charac-terization results demonstrate that chemisorbed oxygen facilitate nitro/nitrites intermediates formation,contributing to the NOx 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 NOx release between the temperatures of 150-200 ℃.The nitrate formed via lattice oxygen mainly induces the NOx to be released as NO2 within a temperature range of 200-350 ℃,which is advantageous in enhancing the NOx activity of downstream NH3-SCR catalysts,by boosting the fast SCR reaction pathway.Thanks to its low cost,considerable NOx absorption capacity,and optimal release temperature,CO3O4 demonstrates potential as an effective material for passive NOx adsorber applications.

Emission controlCold-startLow-temperature adsorptionCo3O4Nitrate formation

Jinhuang Cai、Shijie Hao、Yun Zhang、Xiaomin Wu、Zhenguo Li、Huawang Zhao

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Department of Environmental Science & Engineering,College of Chemical Engineering,Huaqiao University,Xiamen 361021,China

Wuxi Weifu Environmental Catalysts Co.,Ltd,Wuxi 214000,China

National Engineering Laboratory for Mobile Source Emission Control Technology,China Automotive Technology & Research Center Co.,Ltd.,Tianjin 300300,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaExternal Cooperation Program of Science and Technology Planning of Fujian ProvinceFujian Province Science and Technology Program FundsNational Engineering Laboratory for Mobile Source Emission Control TechnologyScientific Research Funds of Huaqiao University

22006044220060432023100182020H6013NELMS2020A03605-50Y200270001

2024

10.1016/j.cjche.2023.10.013

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.66(2)
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