• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied Surface Science >Insights into the size and structural effects of zeolitic supports on gaseous toluene oxidation over MnO_x/HZSM-5 catalysts
【24h】

Insights into the size and structural effects of zeolitic supports on gaseous toluene oxidation over MnO_x/HZSM-5 catalysts

机译：在MNO_X / HZSM-5催化剂上探讨沸石载体对沸石对气体甲苯氧化的尺寸和结构作用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

HZSM-5 zeolites with microano crystallites and hollow structure were respectively synthesized for the preparation of supported MnOx catalysts, and the size and structural effects of zeolitic supports on both the physicochemical properties and toluene oxidation performances of MnOx/HZSM-5 catalysts were extensively investigated by numerous characterizations and experimental evaluation. Beneficially from the higher surface area and hierarchical porosity of nanoscale hollow HZSM-5 (namely as H-Z5) zeolite, good surface dispersion of MnOx nanoparticles was acquired over the resultant supported MnO, catalyst (namely as MnOx/H-Z5), simultaneously achieving great enhancement of its low-temperature reducibility, surface oxygen mobility and more plentiful surface Mn4+ cations. The superiority in these physicochemical characteristics was reasonably correlated with the optimum catalytic activity and good catalytic durability for toluene oxidation over MnOx/H-Z5. The results of coke analysis indicated that MnOx/H-Z5 exhibited relatively higher coke-resistant ability since the highly dispersed MnOx nanoparticles on zeolite surface effectively promoted the oxidative destruction of toluene and other organics species. A possible reaction mechanism was proposed based on the in situ DRIFTS results, where the key reaction intermediates including benzaldehyde, benzoic acid and cyclic anhydride and the relevant conversion pathways were determined. The surface active oxygen originating from gas-phase oxygen activation by MnOx nanoparticles played a crucial role in the oxidative elimination of coke precursors into carbon dioxide and water under air atmosphere.
机译：分别合成HZSM-5具有微/纳米微晶和中空结构的沸石，用于制备负载的MNOX催化剂，广泛地，沸石载体对MNOX / HZSM-5催化剂的物理化学性质和甲苯氧化性能的尺寸和结构效应是广泛的通过众多表征和实验评估研究。有利地，从纳米级中空HZSM-5的较高表面区域和分层孔隙率（即作为H-Z5）沸石，同时在所得的负载的MNO，催化剂（即作为MNOX / H-Z5）上获得良好的MNOX纳米颗粒的良好表面分散体实现其低温再次还原性，表面氧气流动性和更丰富的表面Mn4 +阳离子的提高。这些物理化学特性的优越性与MNOX / H-Z5上的甲苯氧化的最佳催化活性和良好的催化耐久性合理地相关。焦炭分析结果表明，由于沸石表面上高度分散的MNOX纳米颗粒有效地促进了甲苯和其他有机物物种的氧化破坏，因此Mnox / H-Z5表现出相对较高的焦炭能力。基于原位漂移结果提出了一种可能的反应机理，其中确定了包括苯甲醛，苯甲酸和环酐的关键反应中间体和相关转化途径。来自MNOX纳米颗粒的源自气相氧活化的表面活性氧在氧化消除在空气气氛下的焦炭前体和水中的氧化消除中起到了至关重要的作用。

著录项

  • 来源
    《Applied Surface Science》 |2019年第30期|108-120|共13页
  • 作者

    Zhang Chuanhui; Wang Chao; Huang He; Zeng Kai; Wang Zhong; Jia Hong-peng; Li Xuebing;

  • 作者单位

    Qingdao Univ Coll Mat Sci & Engn Inst Mat Energy & Environm Qingdao 266071 Shandong Peoples R China|Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Technol Key Lab Biofuels Qingdao 266101 Shandong Peoples R China;

    Qingdao Univ Coll Mat Sci & Engn Inst Mat Energy & Environm Qingdao 266071 Shandong Peoples R China;

    Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Technol Key Lab Biofuels Qingdao 266101 Shandong Peoples R China;

    Qingdao Univ Coll Mat Sci & Engn Inst Mat Energy & Environm Qingdao 266071 Shandong Peoples R China;

    Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Technol Key Lab Biofuels Qingdao 266101 Shandong Peoples R China;

    Chinese Acad Sci CAS Ctr Excellence Reg Atmospher Environm Inst Urban Environm Key Lab Urban Pollutant Convers Xiamen 361021 Fujian Peoples R China;

    Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Technol Key Lab Biofuels Qingdao 266101 Shandong Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Toluene oxidation; Hollow structure; Surface dispersion; Catalytic activity; Coke elimination;

    机译：甲苯氧化;中空结构;表面分散;催化活性;焦炭消除;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号