氢气选择性催化还原Pd基催化剂研究进展
Research progress on palladium-based catalysts for NOx reduction by H2-SCR
陈然 1郭淼鑫 2杜君臣 3安正源 4杨艳 4张爱敏4
作者信息
- 1. 昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室,昆明 650106;云南贵金属实验室有限公司,昆明 650106
- 2. 昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室,昆明 650106;北京工业大学 材料科学与工程学院,北京 100124
- 3. 昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室,昆明 650106
- 4. 云南贵金属实验室有限公司,昆明 650106
- 折叠
摘要
氮氧化物(NOx)的排放严重危害了生态环境和人类健康,利用催化还原手段对 NOx进行有效治理对于支持生态可持续发展具有重要的战略意义.氢气选择性催化还原(H2-SCR)作为一种潜在的高效环保型低温脱硝技术受到广泛的关注.贵金属被认为是H2-SCR过程中的关键活性组分,对N2具有高选择性的相对廉价的Pd更是被寄予厚望,然而其对NOx的催化转化活性仍有很大的提升空间.本文综述了近 10 年来国内外有关Pd基H2-SCR催化剂的最新研究进展,介绍了H2-SCR反应的各种可能机理,讨论了制备方法、载体、助剂和烟气组分对催化剂还原NOx效果的影响,总结了当前面临的困难和挑战,并提出以 Pd 为活性组分之一的低贵金属负载的耐水、耐硫型双或多活性中心复合催化剂将成为未来研究的主要方向.
Abstract
The emission of nitrogen oxides(NOx)seriously pollutes the ecological environment and endangers human health,therefore reducing NOx emission is an important techoque.Selective catalytic reduction of NOx by hydrogen(H2-SCR),as a highly effiecent de-NOx method,has received extensive attention.Precious metals,particularly Palladium,are considered to be the key active components in the H2-SCR process.Pd exhits great catalytic activity in the reduction of NOx by hydrogen,and is cheaper than rhodium.In this paper,the latest research progress on Pd-based catalysts for NOx reduction by H2-SCR in the past 10 years has been reviewed,including the possible mechanisms of H2-SCR reaction and the effects of preparation processes,supports,additives and flue gas components on the reduction of NOx.The current difficulties and challenges were also analyzed.It is proposed that future research should focus on the development of low loaded Pd-based composite catalysts with double or multi-active centers to endow the catalysts with water-resistant and sulfur-resistant ability.
关键词
H2-SCR/氮氧化物/脱硝技术/钯基催化剂Key words
H2-SCR/nitrogen oxides/De-NOx technology/Pd-based catalyst引用本文复制引用
出版年
2024
NETL
NSTL
万方数据