应对国六排放的柴油机尾气NOx催化转化剂的试制研究

韦夏夏; 谭宗勇; 陈梦寅; 刘来君; 唐富顺; 孙强; 刘光文

doi:10.3969/j.issn.1001-2222.2021.01.012

车用发动机 >

2021 , Vol. 0 >Issue 1: 69

DOI: https://doi.org/10.3969/j.issn.1001-2222.2021.01.012

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应对国六排放的柴油机尾气NO_x催化转化剂的试制研究

韦夏夏 ,
谭宗勇 ,
陈梦寅 ,
刘来君 ,
唐富顺 ,
孙强 ,
刘光文

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（1.桂林理工大学化学与生物工程学院材料科学与工程学院，广西桂林 541004；2.广西辉煌朗洁环保科技有限公司，广西北海 536000）

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Preparation of NO_x Converting Catalysts for Diesel Engine Exhaust to Meet China Ⅵ Emission Limit Requirement

WEI Xiaxia ,
TAN Zongyong ,
CHEN Mengyin ,
LIU Laijun ,
TANG Fushun ,
SUN Qiang ,
LIU Guangwen

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(1.College of Chemistry and Bioengineering,College of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,China;2.Guangxi Splendid Lang Jie Environmental Protection Technology Co.,Ltd.,Beihai 536000,China)

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摘要

研究了活性组分负载方式对V₂O₅-WO₃/TiO₂催化剂SCR性能的影响，通过调变助剂组分改善其低温窗口特性，并在稳态工况条件下考察了制备的蜂窝催化剂样品低温SCR催化性能。结果表明，活性组分的负载方式对V₂O₅-WO₃/TiO₂催化剂SCR性能影响较大，共浸法制备的V₂O₅-WO₃/TiO₂催化剂，WO_x物种和VO_x物种在载体表面分散均匀，具有较优的SCR活性，同时通过CeO₂和SnO₂组分的调变，其低温SCR性能显著改善。稳态工况试验表明，共浸渍法制备的CeO₂、SnO₂调变型V₂O₅-WO₃/TiO₂蜂窝催化剂样品具有稳定优异的低温SCR催化性能，具有潜在的满足国六排放柴油发动机尾气NO_x转化的商业价值。

关键词： 柴油机; 选择性催化还原; 催化剂; 制备

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韦夏夏 , 谭宗勇 , 陈梦寅 , 刘来君 , 唐富顺 , 孙强 , 刘光文 . 应对国六排放的柴油机尾气NO_x催化转化剂的试制研究[J]. 车用发动机, 2021 , 0(1) : 69 . DOI: 10.3969/j.issn.1001-2222.2021.01.012

Abstract

The effects of loading methods of active components on the SCR performance of V₂O₅-WO₃/TiO₂catalyst were studied, the low-temperature window characteristics of catalyst improved by changing the assistant components, and the catalytic performance of prepared honeycomb catalyst sample was investigated under steadystate conditions. The results showed that the loading methods of active components had great influence on the SCR performance of V₂O₅-WO₃/TiO₂ catalyst. WO_x species and VO_x species were evenly dispersed on the surface of TiO₂ carrier with better SCR activity for the V₂O₅-WO₃/TiO₂ catalyst prepared by co-impregnation method. Meanwhile, the low temperature SCR performance significantly improved through the modulation of CeO₂ and SnO₂ components. The steady-state condition test results showed that the CeO₂ and SnO₂ modified V₂O₅-WO₃/TiO₂ honeycomb catalyst samples prepared by co-impregnation method had stable and excellent SCR performance at low temperature and had potential commercial value for the NO_xconversion of diesel engine exhaust which meet China Ⅵ emission limit requirement.

Key words： diesel engine; selective catalytic reduction(SCR); catalyst; preparation

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