球磨制备低钒基催化剂的NH<sub>3</sub>-SCR脱硝性能

张茹杰; 王夫美; 白鹏飞; 陈小根; 王志; 沈伯雄; 吴春飞

doi:10.13205/j.hjgc.202103015

球磨制备低钒基催化剂的NH₃-SCR脱硝性能

doi: 10.13205/j.hjgc.202103015

河北工业大学能源与环境工程学院天津市清洁能源利用与污染物控制重点实验室, 天津 300401

基金项目:

科技部重点研发专项（2018YFB0605101）；天津市自然科学基金重点（18JCZDJC39800）；天津市科技专项（18ZXSZSF00040）；天津市平台科技专项（18PTZWHZ00010）；天津市科普项目（18KPXMSF00080），河北省教育厅项目（D2019065）。

详细信息

作者简介:
张茹杰(1996-),女,硕士,主要研究方向为大气污染物控制。2962228220@qq.com

通讯作者:
王夫美(1986-),女,博士,副教授,主要研究方向为燃煤烟气污染物脱除。wfmgood225@hebut.edu.cn

沈伯雄(1971-),博士,教授,主要研究方向为大气污染物控制与固体废物处理处置方向。shenbx@hebut.edu.cn

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出版历程
- 收稿日期: 2020-02-27
- 网络出版日期: 2021-07-19

NH₃-SCR PERFORMANCE OF LOW VANADIUM-BASED CATALYST PREPARED BY BALL MILLING

Tianjin Key Laboratory of Clean Energy and Pollution Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China

摘要

摘要: 采用球磨混合方法，将催化剂以m（Cu/SAPO-34）：m（VW/TiO₂）为1：1的比例制得干混样品SAPO-Ti。利用固定床实验台架研究了混合催化剂的NH₃-SCR脱硝性能及其抗硫性能。采用 XRD、BET、SEM、H₂-TPR、NH₃-TPD和in-situ DRIFT对材料进行表征，结果显示，球磨混合样品SAPO-Ti同时具有2种催化剂的晶体结构，且酸量增加，中温活性提高。表面形貌研究表明，VW/TiO₂催化剂覆盖在Cu/SAPO-34催化剂表面，对Cu/SAPO-34催化剂起到保护作用；原位红外结果显示，Cu/SAPO-34催化剂硫中毒失活主要是在Cu活性位上形成硫酸盐物种，导致活性位减少，脱硝效率下降，而SAPO-Ti表面形成硫酸盐的数量减少，抗硫性能提高，主要是由于表面VW/TiO₂催化剂具有良好的抗硫性，保护内部Cu²⁺活性位，以保持高效中温脱硝性能。
- 催化剂 /
- 选择性催化还原 /
- 球磨混合 /
- 失活 /
- 抗硫性
Abstract: The modified sample SAPO-Ti was prepared by ball-milling method with Cu/SAPO-34 catalyst and VW/TiO₂ catalyst with a mass ratio of 1:1. The performance and sulfur resistance of mixed catalyst in NH₃-SCR process was studied by a fixed bed test bench. The physical and chemical properties of the catalysts were characterized by X-ray diffraction analysis (XRD), N₂ adsorption-desorption (BET), scanning electron microscope (SEM), hydrogen temperature programmed reduction (H₂-TPR), NH₃-TPD and in-situ DRIFT. The results showed that the ball-milled mixed sample SAPO-Ti remained the crystal structure of the two catalysts with high acid content and moderate-temperature activity. Surface morphology showed that the VW/TiO₂ catalyst covered on the surface of the Cu/SAPO-34 catalyst and protected Cu/SAPO-34 catalyst framework; the sulfur poisoning was observed by in-situ DRIFT, and the results showed that sulfur poisoning deactivation of Cu/SAPO-34 mainly formed sulfate species on the active site of Cu, which reduced the active sites and then desulfurixation efficiency. However, the accumulation of sulfur-contained species formed on the surface of SAPO-Ti catalyst obviously was reduced and the sulfur resistance was improved, because VW/TiO₂ in the outer surface with high sulfur resistance protected the internal Cu²⁺ active sites to maintain the high efficiency of medium temperature demitration and kept Cu/SAPO-34 catalyst from poisoning.
- catalyst /
- SCR /
- ball milling modification /
- deactivation /
- sulfur resistance

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