Poisoning Effects of Chlorine on V2O5–WO3/TiO2 Catalysts for Selective Catalytic Reduction of NOx by NH3

IF 2.1 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Surveys from Asia Pub Date : 2022-12-08 DOI:10.1007/s10563-022-09386-4

Jie Yu, Lei Qiu, Yimeng Yin, Xing Li, Haohui Chen, Chizhong Wang, Huazhen Chang

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引用次数: 1

Abstract

Chlorine species, widely presented in industrial flue gas such as the waste incineration plants, can poison the catalysts and affect the selective catalytic reduction (SCR) performance. In this work, effects of Cl on the SCR performance of V₂O₅–WO₃/TiO₂ (VW/Ti) catalysts were investigated by NH₄Cl deposition. The results showed that the NO_x conversion efficiency at low reaction temperature (< 300 °C) decreased with the loading of NH₄Cl after calcination. It was found that instead of causing the chlorination of VW/Ti catalyst the NH₄Cl decomposed into volatile Cl species due to the weak V–Cl bonding. Such decomposition reduced significantly the surface non-lattice oxygen species to inhibit NO adsorption and activation, but hardly affected the redox ability and acidity of VW/Ti catalyst. Time–resolved in situ DRIFTs results indicated that NH₃ activation and the SCR process predominated by Eley–Rideal mechanism were not influenced with NH₄Cl impregnation, while the SCR at low temperature following a Langmuir–Hinshelwood path was limited by the decreased and weaker binding sites for NO activation.

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氯对V2O5-WO3 /TiO2催化剂NH3选择性催化还原NOx的中毒效应

氯广泛存在于垃圾焚烧厂等工业烟气中，对催化剂有毒害作用，影响选择性催化还原(SCR)性能。本文采用NH4Cl沉积法研究了Cl对V2O5-WO3 /TiO2 (VW/Ti)催化剂SCR性能的影响。结果表明:随着煅烧后NH4Cl的负荷增加，低反应温度(< 300℃)下NOx转化效率降低;结果表明，由于弱V-Cl键，NH4Cl并未引起VW/Ti催化剂的氯化反应，而是分解为挥发性Cl。这种分解明显减少了表面非晶格氧，抑制了NO的吸附和活化，但对VW/Ti催化剂的氧化还原能力和酸度几乎没有影响。时间分辨率原位漂移结果表明，NH4Cl浸渍不影响NH3活化和以ley - rideal机制为主的SCR过程，而低温下遵循Langmuir-Hinshelwood路径的SCR则受到NO活化结合位点减少和减弱的限制。

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来源期刊

Catalysis Surveys from Asia 化学-物理化学

CiteScore

4.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Early dissemination of important findings from Asia which may lead to new concepts in catalyst design is the main aim of this journal. Rapid, invited, short reviews and perspectives from academia and industry will constitute the major part of Catalysis Surveys from Asia . Surveys of recent progress and activities in catalytic science and technology and related areas in Asia will be covered regularly as well. We would appreciate critical comments from colleagues throughout the world about articles in Catalysis Surveys from Asia . If requested and thought appropriate, the comments will be included in the journal. We will be very happy if this journal stimulates global communication between scientists and engineers in the world of catalysis.