Highly Selective, Active, and Stable Metal Nanoparticle Catalysts with Ultra-Thin Porous Ceramic Shells for Size-Selective Chemical Reactions

高选择性、活性和稳定的金属纳米粒子催化剂，具有超薄多孔陶瓷壳，用于尺寸选择性化学反应

• 批准号: 1803812
• 负责人: Xinhua Liang
• 金额: $ 31.8万
• 依托单位: Missouri University of Science and Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1803812&HistoricalAwards=false
• 关键词: Highly; Selective; Active; Stable; Metal

Size-selective catalysts with metal cores and porous shell structures can increase reaction selectivity through molecular discrimination of reactants. The selectivity of a catalyst can be improved by tuning the pore size of the porous films. However, selectivity is generally improved at the expense of catalytic reactivity. The proposed project is aimed at developing methods for preparing nanostructured size-selective catalysts that exhibit both high selectivity and activity. The proposed strategy for size-selective catalyst preparation can be applied to a great variety of supported metal catalysts and may also find applications in other fields, including sensors, fuel cells, batteries, and supercapacitors.The primary objectives of this project are: (a) to develop a novel nanostructured size-selective catalyst with a nanoscale (less than 5 nm thick) porous ceramic overlayer capped on every metal nanoparticle surface and (b) to gain a fundamental understanding of the structure-activity-selectivity relationships of the catalysts. A unique molecular layer deposition (MLD) technique will be utilized to synthesize the highly porous overlayers with precise thickness control and well-defined porous structures. The sizes of pores can be controlled by altering MLD chemistry, oxide types, and formation methods of porous structures. There is a plan to introduce results from this project into the Chemical Engineering curriculum at Missouri S&T and develop a new course: "Nanotechnology in Catalysis". Graduate and undergraduate students will be recruited to participate in this research project with special emphasis on recruiting underrepresented minorities through a collaboration with Lincoln University of Missouri - an 1890 Historically Black College & University. An annual " Nanomaterials Show" will be developed and used to stimulate interest of general audiences and K-12 students in the field chemical engineering and nanotechnology.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

具有金属核和多孔壳结构的尺寸选择性催化剂可以通过反应物的分子辨别来提高反应选择性。通过调节多孔膜的孔径可以提高催化剂的选择性。然而，选择性的提高通常是以牺牲催化反应性为代价的。该项目旨在开发制备具有高选择性和活性的纳米结构尺寸选择性催化剂的方法。 所提出的尺寸选择性催化剂制备策略可应用于多种负载金属催化剂，也可能在其他领域得到应用，包括传感器、燃料电池、电池和超级电容器。该项目的主要目标是：（a）开发一种新型纳米结构尺寸选择性催化剂，其在每种金属上覆盖有纳米级（厚度小于5纳米）多孔陶瓷覆盖层 纳米颗粒表面和（b）获得对催化剂的结构-活性-选择性关系的基本了解。将利用独特的分子层沉积（MLD）技术来合成具有精确厚度控制和明确多孔结构的高度多孔覆盖层。孔的大小可以通过改变 MLD 化学成分、氧化物类型和多孔结构的形成方法来控制。计划将该项目的成果引入密苏里科技大学的化学工程课程，并开发一门新课程：“催化纳米技术”。将招募研究生和本科生参与该研究项目，特别强调通过与密苏里州林肯大学（一所 1890 年历史悠久的黑人学院和大学）合作招募代表性不足的少数族裔。将开发并利用一年一度的“纳米材料展”来激发普通观众和 K-12 学生对化学工程和纳米技术领域的兴趣。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Highly Active and Stable Fe/SiO2 Catalyst Synthesized by Atomic Layer Deposition for CO Oxidation

• DOI: 10.1007/s10562-020-03224-w
• 发表时间: 2020-04
• 期刊: Catalysis Letters
• 影响因子: 2.8
• 作者: Xiaofeng Wang;Baitang Jin;Xiaoqing He;T. White;Xinhua Liang

Synthesis of High Metal Loading Single Atom Catalysts and Exploration of the Active Center Structure

• DOI: 10.1002/cctc.202001255
• 发表时间: 2020-11
• 期刊: ChemCatChem
• 影响因子: 4.5
• 作者: Kaiying Wang;Xiaofeng Wang;Xinhua Liang

Supported Single Fe Atoms Prepared via Atomic Layer Deposition for Catalytic Reactions

• DOI: 10.1021/acsanm.0c00146
• 发表时间: 2020-02
• 作者: Xiaofeng Wang;Baitang Jin;Ye Jin;Tianpin Wu;Lu Ma;Xinhua Liang