SCR脱硝金属氧化物催化剂研究进展

氮氧化物是大气主要污染物之一,选择性催化还原(SCR)是国内外工业锅炉(窑炉)烟气脱硝的主要技术途径。脱硝催化剂是SCR技术的核心,近几十年来为人们所关注和广泛研究。金属氧化物催化剂材料来源广泛,制备简单,脱硝效率稳定,在工业锅炉(窑炉)烟气脱硝中具有广阔的应用前景,因而成为人们研究关注的重点。本文基于SCR烟气脱硝理论现状,归纳了金属氧化物催化剂优化设计的关键与重要基础,同时,梳理了目前备受研究关注的钒基、锰基、铈基、铁基等四种典型金属氧化物催化剂的研究进展,系统介绍了不同氧化物催化剂的脱硝机理、本质特征、元素改良、结构和形貌设计,以及存在的问题等,并展望了今后金属氧化物催化剂研究的发展趋势,为今后工业锅炉(窑炉)烟气高效脱硝催化剂的研发提供参考借鉴。

Research Progress on SCR DeNOx Metallic Oxide Catalysts

Nitrogen oxides are the one of major air pollution. Selective catalytic reduction (SCR) is the main technical way of high-efficiency DeNO_x of industrial boiler (kiln) flue gas at home and abroad. The DeNO_x catalyst is the core of SCR technology, which has been concerned and widely studied in recent decades. Metal oxide catalyst has a broad application prospect in industrial boiler (kiln) flue gas DeNO_x, wide range of material sources, simple preparation and stable DeNO_x efficiency, and it becomes the focus of research attention. Based on the current situation of SCR flue gas DeNO_x theory, the key and important basis for the optimal design of metal oxide catalysts were summarized. At the same time, the research progress of four typical metal oxide catalysts, such as vanadium, manganese, cerium and iron, was reviewed. The DeNO_x mechanism, essential characteristics, element improvement, structure and morphology design and existing problems of different oxide catalysts were introduced systematically, and the development trend of metal oxide catalysts in the future was prospected. It would provide reference for the research of efficient DeNO_x catalyst for industrial boiler (kiln) flue gas.