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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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用于NH3选择性催化还原NOx的钒基催化剂
, PP. 445-455
Keywords: 钒基催化剂,NH3-SCR,烟气脱硝,柴油车尾气净化,反应机理,非钒基催化剂
Abstract:
在富氧且有催化剂存在条件下以NH3或尿素为还原剂选择性地还原NOx为N2的技术,即NH3/Urea-SCR技术,是去除固定源和移动源NOx最为有效且应用最广的技术之一,其中最重要的催化剂体系是钒基催化剂。本文从钒基催化剂的组成及其NH3-SCR反应性能、钒基催化剂的活性改进以及钒基催化剂上的NH3-SCR反应机理三个方面对该领域的研究进展做了较为全面的综述,并对NH3-SCR领域可能的发展方向做了展望。传统的V2O5-WO3(MoO3)/TiO2催化剂以及改性后的钒基催化剂在中温段具有优异的NOx净化效率和抗SO2中毒性能,其中高分散的V5+物种以及多聚的钒酸盐物种为NH3-SCR反应的活性中心。针对采用不同方法制备的或具有不同组成的钒基催化剂体系,多数学者认为NH3-SCR反应按照Eley-Rideal(E-R)机理进行,部分学者认为按照Langmuir-Hinshelwood(L-H)机理进行,这可能与催化剂的钒负载量以及反应温度区间相关。在后续工作中研究者应结合多种测试手段,具体问题具体分析,综合考虑温度的动态影响以及表面酸碱性对反应物的吸附活化,以得出更为全面、真实的反应机理。系统了解前人在钒基NH3-SCR催化剂领域的研究进展有助于现阶段开发高效稳定、可适应复杂工作条件的钒基SCR催化转化器,同时也对设计合成新型高效、环境友好且抗中毒的非钒基SCR催化剂体系具有一定的参考价值。
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