商用选择性催化还原催化剂SO2氧化率控制研究进展

doi:10.16085/j.issn.1000-6613.2017.06.025

摘要/Abstract

摘要： 选择性催化还原（SCR）法作为目前最成熟的氮氧化物（NO_x）控制技术被广泛地应用于燃煤电站等行业的NO_x排放控制过程，其核心是催化剂。商用SCR催化剂一般是以V₂O₅为活性组分、WO₃（或MoO₃）为催化助剂、TiO₂为载体的V₂O₅-WO₃（MoO₃）/TiO₂催化剂。该催化剂在催化NO_x还原的同时也会催化SO₂的氧化，生成的SO₃会给脱硝工程带来一系列的不利影响。基于此，本文首先介绍了钒钛催化剂催化氧化SO₂的反应机理及其研究进展，随后综述了影响SO₂氧化率的主要因素，主要包括催化剂中V₂O₅含量、催化助剂、飞灰、壁厚及烟气成分、反应温度等，并详细地分析了各因素对SO₂氧化率的影响特性。在此基础上，综述了控制SCR催化剂SO₂氧化率的方法。最后指出SO₂氧化率控制技术的发展对低SO₂氧化率脱硝催化剂的开发、失活催化剂的再生以及废弃催化剂的回用等均有着重要意义，是未来研究和开发的重点方向。

关键词: 选择性催化还原, SO₂氧化, 催化剂, 影响因素, 控制技术

Abstract: As the best nitrogen oxide(NO_x)control technology,selective catalytic reduction(SCR) has been widely used in NO_x emission control. The core of this technology is the catalyst. Typically,commercial V₂O₅-WO₃ (MoO₃)/TiO₂SCR catalyst consists of V₂O₅ as the active component,WO₃ or MoO₃ as the promotor,and TiO₂ as the carrier. During the catalytic reduction of NO_x,however,the oxidation of SO₂ is catalyzed as well and the generated SO₃ have significant negative effects on the denitrification process. In this review,the mechanism and research progress of SO₂ oxidation were introduced at first. Then the main influence factors of the SO₂oxidation rate were reviewed and analyzed in detail,including V₂O₅ content,catalytic promoters,fly ash,catalyst wall thickness,flue gas composition and reaction temperature. On this basis,methods for controlling the SO₂ oxidation rate over SCR catalyst were summarized. Overall,the SO₂ oxidation rate control technology has made significant contributions to the development of low SO₂ oxidation rate catalysts,regeneration of deactivated catalysts as well as recycling of disabled catalysts,and therefore deserves further research and development.

Key words: selective catalytic reduction(SCR), SO₂ oxidation, catalyst, influence factor, control technology

中图分类号:

TQ032.4

唐昊, 李文艳, 王琦, 陆强, 李慧, 胡笑颖, 董长青. 商用选择性催化还原催化剂SO₂氧化率控制研究进展[J]. 化工进展, 2017, 36(06): 2143-2149.

TANG Hao, LI Wenyan, WANG Qi, LU Qiang, LI Hui, HU Xiaoying, DONG Changqing. Research progress on the control of SO₂ oxidation by commercial SCR catalyst[J]. Chemical Industry and Engineering Progress, 2017, 36(06): 2143-2149.

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商用选择性催化还原催化剂SO₂氧化率控制研究进展

Research progress on the control of SO₂ oxidation by commercial SCR catalyst

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