H_(2)-SCR改性铂系催化剂低温脱硝的应用及性能强化挑战  

Application and performance enhancement challenges of H_(2)-SCR modified platinum-based catalysts for low-temperature denitrification

作　　者：张巍[1,2] 秦川 谢康 周运河 董梦瑶 李婕 汤云灏 马英 宋健 ZHANG Wei;QIN Chuan;XIE Kang;ZHOU Yunhe;DONG Mengyao;LI Jie;TANG Yunhao;MA Ying;SONG Jian(School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan,China;Key Laboratory of Renewable Energy and Electric Power Technology of Hunan Province,Changsha 410114,Hunan,China;Yonker Environmental Protection Company Limited,Changsha 410330,Hunan,China;Hunan Datang Energy-saving Technology Company Limited,Changsha 410007,Hunan,China)

机构地区：[1]长沙理工大学能源与动力工程学院,湖南长沙410114 [2]可再生能源电力技术湖南省重点实验室,湖南长沙410114 [3]永清环保股份有限公司,湖南长沙410330 [4]湖南大唐节能科技有限公司,湖南长沙410007

出　　处：《化工进展》2023年第6期2954-2962,共9页Chemical Industry and Engineering Progress

基　　金：国家留学基金(201808430112);湖南省自然科学基金(2020JJ4098);湖南省教育厅科学研究项目重点项目(21A0216);长沙理工大学青年教师成长计划(2019QJCZ044);“可再生能源电力技术”湖南省重点实验室开放基金(2018ZNDL004,2020ZNDL001)。

摘　　要：氮氧化物(NOx)的排放严重危害了生态环境和人类健康,其主要来源有固定源烟气排放和移动源尾气排放。近年来,利用氢气选择性催化还原(H_(2)-SCR)改性铂系催化剂控制移动源NOx的相关研究引起了广泛的关注,由于不同的改性方法可以促进铂与载体之间的电子迁移,从而形成双功能反应机制酸位点,因而通过深入认识铂系H_(2)-SCR催化剂的NOx催化反应机制并获得良好的改性方法对于开发高效移动源脱硝催化剂具有深远的意义。本文综述了铂系H_(2)-SCR脱硝催化剂的种类,阐述了其表面的H_(2)/NO吸附机制、NO氧化还原机制和双功能反应机制,总结了提高铂系H_(2)-SCR催化剂的稳定性、抗硫性和选择性的强化方法。进一步阐述了金属氧化物和分子筛负载型铂系H_(2)-SCR催化剂可变的多价态,电子迁移能力,NO、H_(2)和O2在催化剂表面的反应机理,并对铂负载减量化降低成本的相关研究进行了展望。The emission of nitrogen oxides(NOx)has seriously harmed the ecological environment and human health,and they are mainly from fixed source of flue gas emissions and mobile source of exhaust emissions.In recent years,hydrogen selective catalytic reduction(H_(2)-SCR)to modify platinum based catalysts to control mobile source NOx has attracted extensive attention.Because different modification methods can promote the electron migration between platinum and the support to form bifunctional reaction mechanism acid sites,Therefore,it is of far-reaching significance to develop efficient mobile source denitration catalysts by deeply understanding the NOx catalytic reaction mechanism of platinum based H_(2)-SCR catalysts.In this paper,the types of platinum based H_(2)-SCR denitration catalysts are reviewed,and the mechanisms of H_(2)/NO adsorption,NO oxidation reduction,and dual function reaction on their surfaces are described.The strengthening methods to improve the stability,sulfur resistance and selectivity of platinum based H_(2)-SCR catalysts are summarized.Further investigations of the multivalence and electron mobility of highly efficient metal oxide and molecular sieve-loaded Pt-based H_(2)-SCR catalysts and the mechanism of NO,H_(2),and O2 on the catalyst surface,as well as the reduction of Pt loading for cost reduction,are also foreseen.

关 键 词：铂系催化剂 H_(2)-选择性催化还原 低温脱硝 催化剂载体 

分 类 号：X511[环境科学与工程—环境工程]