• 关键词：氮氧化物  V₂O₅/TiO₂  催化剂活性  中毒

• 基金项目：中国华电工程(集团)有限公司科技项目(No.CHEC-KJ-2011-39)

• 杜振
• 华电电力科学研究院,杭州 310030

• 付银成
• 能源清洁利用国家重点实验室 浙江大学,杭州 310027

• 朱跃
• 华电电力科学研究院,杭州 310030

• 摘要：选择性催化还原(SCR)催化剂是SCR烟气脱硝技术的核心,是整个SCR系统脱硝效率和经济性的决定因素.本文工作的主要研究思路是以钒钛SCR催化剂为研究对象,研究了H₂O和SO₂,以及相同含量下K、Na、Ca、Pb的氧化物对钒钛催化剂NO转化率的影响.H₂O的存在会抑制V₂O₅/TiO₂催化剂脱硝活性,而SO₂在一定程度上促进(V₂O₅/TiO₂)催化剂的SCR脱硝反应,提高NO转化率;碱金属K对钒钛催化剂的钝化作用都是最强,K₂O和Na₂O的掺入会抑制钒钛催化剂上V₂O₅的还原能力,而CaO和PbO的掺入对钒钛催化剂上V₂O₅的还原能力影响较小.

• Abstract：SCR catalysts affect the NO_x removal efficiency and the cost of the whole SCR system, thus playing a pivotal role in SCR technology. This study therefore focuses on V₂O₅/TiO₂ SCR catalysts. The effects of H₂O, SO₂, and oxides of K, Na, Ca and Pb on the NO conversion of V₂O₅/TiO₂ catalysts were studies. The results showed that the presence of H₂O decreased the denitration activity of V₂O₅/TiO₂ catalysts. SO₂ promoted the SCR DeNO_x reaction of V₂O₅/TiO₂ catalysts to a certain extent, and improved the NO conversion rate. Potassium had the strongest poisoning effect on the catalysts among all four metals in form of either oxides or salts. K₂O and Na₂O might inhibit the reducing capability of V₂O₅ on the surface of V₂O₅/TiO₂ catalyst, while CaO and PbO had little effect on the reducing capability of V₂O₅.

• Key words：nitric oxide  V₂O₅/TiO₂  catalyst activity  poisoning

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