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双掺杂稀土钙钛矿型多孔纳米管稀燃NOx阱催化剂研究

批准号21706191 学科分类催化材料与催化剂工程 ( B080303 )
项目负责人马爱静 负责人职称博士后 依托单位天津工业大学
资助金额24.00
万元
项目类别青年科学基金项目 研究期限2018 年 01 月 01 日 至
2020 年 12 月 31 日
中文主题词稀燃氮氧化物;稀土钙钛矿;多孔纳米管;构效关系;抗硫
英文主题词Lean-burn NOx;Rare-earth perovskite;Porous nanotube;Structure-activity relationship;Sulfur tolerance

摘要

中文摘要 稀薄燃烧(简称稀燃)可以提高燃油效率,减少CO2的排放,但是过量的氧气增加了尾气中NOx消除难度。稀燃NOx阱(lean-burn NOx trap, LNT)技术是解决该问题的最有效途径之一。申请人前期研究表明,稀土钙钛矿(ABO3)具有可媲美贵金属催化剂的LNT活性,通过碱性金属对A位的掺杂可以增加氧空位浓度,进一步提高其催化性能;通过Fe元素对B位的掺杂可以提高其抗硫性能。但是传统钙钛矿存在比表面积较小,稀/富燃循环中结构易破坏等问题。.针对上述问题,本项目拟制备双掺杂稀土钙钛矿型多孔纳米管LNT催化剂,利用多孔管壁增加比表面积;利用中空结构克服体积变化引起的结构破坏。结合多种表征技术,详细考察比表面积,中空结构,氧空位浓度和Fe掺杂量对LNT催化及抗硫性能影响,阐明催化剂的构效关系。项目的顺利实施将为设计开发高效实用的LNT催化剂提供理论基础和实验依据。
英文摘要 Lean-burn combustion can improve the fuel efficiency and reduce the emission of CO2. However, the presence of excess oxygen increases the difficulty of NOx removal in exhaust. Lean-burn NOx trap (LNT) technique is one of the most effective ways to solve the problem. Our previous research has confirmed that rare-earth perovskites (ABO3) show as good LNT activities as noble-metal catalysts. The alkali metal dopant in A site can further improve its LNT activities due to the increases of oxygen vacancies. Meanwhile, Fe dopant in B site can improve its sulfur resistance. However, the small specific surface area and structure destruction occurred during lean/rich cycles limit the application of traditional perovskite-type catalysts. .To overcome these problems, this project will synthesize double-doped rare-earth perovskite-type porous nanotubes as LNT catalysts. The porous wall of nanotubes can increase the specific surface area and the hollow structure can relieve the structure destruction from volume change. The effects of specific surface area, hollow structure, oxygen vacancies and Fe doping content on its LNT catalytic performance and sulfur tolerance will be studied with the help of characterization techniques. Finally, the structure-activity relationship of LNT catalyst is clearly revealed. The successful implementation of this project will serve theoretical basis and experimental evidences for the design and development of high-efficiency and economic LNT catalysts.
结题摘要

成果

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