高等学校化学学报 ›› 2025, Vol. 46 ›› Issue (2): 20240455.doi: 10.7503/cjcu20240455

• 物理化学 • 上一篇    下一篇

MO δ /3DOM ZSM-5催化剂的制备及同时消除炭烟和NOx的催化性能

王斓懿1, 王世伟1, 陈心宇1, 于迪2, 张春雷2, 范晓强1, 于学华1(), 赵震1,2()   

  1. 1.沈阳师范大学化学化工学院, 能源与环境催化研究所, 沈阳 110034
    2.中国石油大学(北京)重质油国家重点实验室, 北京 102249
  • 收稿日期:2024-10-08 出版日期:2025-02-10 发布日期:2024-12-07
  • 通讯作者: 于学华,赵震 E-mail:yuxuehua1986@163.com;zhenzhao@cup.edu.cn
  • 基金资助:
    国家自然科学基金(22402129);国家重点研发计划项目(2022YFB3506200);辽宁省教育厅高等学校基本科研项目(LJ202410166024);辽宁省研究生教育教学改革研究资助项目(LNYJG2023280);辽宁省优秀青年科学基金(2022-YQ-20);辽宁省兴辽英才计划项目(XLYC2203007);沈阳师范大学博士启动基金(BS202416)

Preparation of MO δ /3DOM ZSM-5 Catalysts and Their Catalytic Performance for the Simultaneous Removal of Soot and NOx

WANG Lanyi1, WANG Shiwei1, CHEN Xinyu1, YU Di2, ZHANG Chunlei2, FAN Xiaoqiang1, YU Xuehua1(), ZHAO Zhen1,2()   

  1. 1.Institute of Catalysis for Energy and Environment,College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 110034,China
    2.State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China
  • Received:2024-10-08 Online:2025-02-10 Published:2024-12-07
  • Contact: YU Xuehua, ZHAO Zhen E-mail:yuxuehua1986@163.com;zhenzhao@cup.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22402129);the National Key R&D Program of China(2022YFB3506200);the Fundamental Research Funds for the Liaoning Universities, China(LJ202410166024);the Postgraduate Education Reform Project of Liaoning Province, China(LNYJG2023280);the Excellent Youth Science Foundation of Liaoning Province, China(2022-YQ-20);the Liaoning Xingliao Talented Youth Top Talent Program, China(XLYC2203007);the Doctoral Initiation Fund of Shenyang Normal University, China(BS202416)

摘要:

炭烟颗粒和NOx作为柴油机尾气的主要污染物严重危害了人体健康与环境. 因此, 炭烟与NOx的催化净化得到了广泛关注. 本文设计制备了具有独特孔结构的三维有序大孔(3DOM)ZSM-5分子筛催化剂, 并将其作为载体, 制备了一系列3DOM ZSM-5担载MOδ (M=Mn, Fe, Co, Ce, Pr, W)的催化剂. 所制备催化剂均具有独特的多级孔结构, 有利于炭烟与NOx等小分子的捕捉与传质, 可进一步增强催化剂的催化性能. 其中, MnOδ/3DOM ZSM-5催化剂具有最佳的同时消除炭烟与NOx的催化性能, 其炭烟燃烧的峰值温度最低(453 ℃), 80%以上NO转化率的初始温度最低(184 ℃)且温度窗口较宽(184~362 ℃). 该催化剂优异的催化性能与其良好的氧化还原性能、 丰富的酸位点、 充足的活性氧以及丰富的多级孔结构有关. 动力学测试结果表明, MnOδ/3DOM ZSM-5催化剂具有最高的本征活性. 根据催化剂的活性测试和原位漫反射红外光谱(in situ DRIFTS)结果, 推断了该催化剂在不同温度下的反应机理. 在低温(<300 ℃)条件下, 反应以脱硝为主, 主要遵循Eley-Rideal(E-R)机理; 在高温条件下(>300 ℃)主要以炭烟燃烧为主, 包括活性氧机理和NO2辅助机理.

关键词: MOδ/3DOM ZSM-5催化剂, 炭烟燃烧, NOx去除, 反应机理

Abstract:

Soot particles and NOx, as the main pollutants in diesel engine exhaust, have caused a serious threat to people's health and the surrounding environment. Therefore, the catalytic purification of soot and NOx is of wide concern. In this work, the three-dimensionally ordered macroporous(3DOM) ZSM-5 zeolite catalyst with unique pore structures was prepared and taken as a carrier. The 3DOM ZSM-5 supported MOδ(M=Mn, Fe, Co, Ce, Pr, W) catalysts were also prepared. The prepared catalysts have a unique hierarchical pore structure, which is conducive to the capture and mass transfer of soot and small molecules such as NOx, thereby enhancing the catalytic performance of the catalysts. Among the prepared catalysts, MnOδ/3DOM ZSM-5 catalyst exhibits the best catalytic performance for the simultaneous removal of soot and NOx, and its peak temperature for soot combustion is the lowest(453 ℃), the initial temperature for NO conversion above 80% is the lowest(184 ℃) and the temperature window(184—362 ℃) over 80% NO conversion is wider. The excellent catalytic performance of MnOδ/3DOM ZSM-5 is related to the good redox ability, abundant acid sites, sufficient reactive oxygen species, and rich hierarchical pore structures. Meanwhile, MnOδ/3DOM ZSM-5 catalyst also has the highest intrinsic activity according to the kinetic test results. In addition, based on the results of the activity test and in situ diffuse reflectance infrared spectroscopy(in situ DRIFTS), the reaction mechanisms of the catalyst at different temperatures were proposed. At low temperatures (<300 ℃), the reaction mainly belongs to denitrification, following the Eley-Rideal(E-R) mechanism. Soot combustion mainly occurs at high temperatures(>300 ℃), including activated oxygen mechanism and NO2 assisted mechanism.

Key words: MOδ/3DOM ZSM-5 catalyst, Soot combustion, NOx removal, Reaction mechanism

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