摘要
SO2是燃煤烟气中对环境污染最严重的气体之一,目前大规模应用的烟气脱硫方法普遍存在资源消耗大、脱硫产物利用率低等缺陷。而利用还原性气体还原SO2不仅能够高效的脱除烟气中的SO2,更可以得到产物单质S,这正是我国目前仍需大量进口的重要化工原料。本文依次介绍了使用H2、CH4、CO和水煤气等还原性气体催化还原SO2为单质S的研究进展,针对不同的还原气体,讨论比较了各自的应用现状及优缺点,重点阐述了不同还原气体所适用催化剂的组成和催化机理,并以SO2转化率、S产率及抗中毒能力等为评价指标,比较了各类催化剂的催化性能,指出Fe系负载型催化剂和复合金属催化剂是未来烟气脱硫中高效催化剂的发展方向。
SO2 is one of the most polluting gases in coal-fired flue gas. At present, flue gas desulfurization methods for large-scale application generally have defects such as high resource consumption and low utilization rate of desulfurization products. The reduction of SO2 by reducing gas can not only effectively remove SO2 from flue gas, but also obtain the product sulfur, which is an important chemical raw material that still needs to be imported in China. In this paper, the research progress of catalytic reduction of SO2 to elemental sulfur by using reducing gases such as H2, CH4, CO and water gas is introduced in turn. According to different reducing gases, the application status, ad-vantages and disadvantages of each reducing gas were discussed and compared. The composition and catalytic mechanism of the catalysts for different reducing gases were highlighted. The catalytic performance of various catalysts was compared with SO2 conversion rate, S yield and anti-poisoning ability. It was pointed out that Fe-based supported catalysts and composite metal catalysts are the development direction of high-efficiency catalysts for flue gas desulfurization in the future.
出处
《分析化学进展》
2019年第1期1-10,共10页
Advances in Analytical Chemistry
基金
国家重点研发计划子课题:热解气均相催化还原SO2技术研究(编号:2017YFB0602903-5)。
