GOALI: Emission, transport and trapping of platinum group derived mobile species in automotive exhaust catalysts

目标：汽车尾气催化剂中铂族衍生移动物质的排放、传输和捕集

• 批准号: 1707127
• 负责人: Abhaya Datye
• 金额: $ 33.75万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-07-01 至 2021-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1707127&HistoricalAwards=false
• 关键词: GOALI; Emission; transport; trapping; platinum

Next-generation fuel-efficient combustion engines require improved catalytic converters in the exhaust system. The proposed research addresses the design of these catalysts by employing novel porous structures. The overarching goal is to reduce exhaust emissions while minimizing impact on fuel economy and reducing the need for precious metals such as Pt and Pd. The proposed research is an industry-university collaboration between GM Global R&D and the University of New Mexico. The project will provide opportunities for students and early career researchers to learn about the challenges in implementing new technologies for exhaust emissions control.The research challenge being addressed here impacts the entire class of heterogeneous catalysts used for meeting the needs for energy, materials and fuels. Automotive exhaust catalysts are subjected to elevated temperatures that lead to growth of nanoparticle size through Ostwald ripening and to loss of activity. The research will look into the role of pore structure and chemistry in the transport of mobile species during Ostwald ripening and in the trapping of the mobile species to limit the growth of particles. Model porous catalysts will be synthesized with systematic control of the size of the pores and the connectivity of the pore network. The transport rates of the mobile species will be studied. Modifying the surface chemistry can influence the diffusive transport and can also effectively trap the mobile species once they get emitted from nanoparticles. The overall outcome from these model studies is a decrease in particle growth rates due to decreased transport rates in pores. Insights from these model porous catalysts will be translated to powder catalysts and tested under realistic conditions using the facilities of the industry partner. The close participation of industry and university researchers is critical for validating the concepts and models. GM has committed significant resources in terms of people time and access to facilities, to enable this research to be successful. The partnership will help address significant unknowns in the understanding of catalyst sintering, and will lead to advances in the synthesis of novel catalysts with improved reactivity and more efficient use of precious metals.The project is co-funded by the Grant Opportunities for Academic Liaison with Industry (GOALI).

下一代节油内燃机需要改进排气系统中的催化转化器。这项拟议的研究旨在通过采用新的多孔结构来设计这些催化剂。总体目标是减少废气排放，同时将对燃油经济性的影响降至最低，并减少对铂和钯等贵金属的需求。这项拟议的研究是通用汽车全球研发与新墨西哥大学之间的产学研合作。该项目将为学生和早期职业研究人员提供机会，了解实施废气排放控制新技术的挑战。这里正在解决的研究挑战影响到用于满足能源、材料和燃料需求的整个类别的多相催化剂。汽车尾气催化剂会受到高温的影响，这会导致纳米颗粒通过Ostwald成熟而长大并失去活性。这项研究将探讨孔结构和化学在奥斯瓦尔德成熟期可移动物种的运输中的作用，以及在限制颗粒增长的可移动物种的捕获中的作用。通过系统地控制孔的大小和孔网络的连通性，将合成出模型孔催化剂。将研究流动物种的运移速率。修饰表面化学可以影响扩散传输，还可以有效地捕获可移动的物种，一旦它们从纳米粒子中释放出来。这些模型研究的总体结果是，由于孔道中传输速率的降低，颗粒生长速率降低。来自这些模型的多孔催化剂的见解将转化为粉末催化剂，并使用行业合作伙伴的设施在现实条件下进行测试。产业界和大学研究人员的密切参与对于验证概念和模型至关重要。通用汽车在人员、时间和设施使用方面投入了大量资源，以使这项研究取得成功。这一合作伙伴关系将有助于解决催化剂烧结方面的重大未知问题，并将导致在合成具有更高反应性和更有效利用贵金属的新型催化剂方面取得进展。该项目由GOALI学术联系机会基金共同资助。

项目成果

Restricting the growth of Pt nanoparticles through confinement in ordered nanoporous structures

通过限制有序纳米多孔结构来限制 Pt 纳米颗粒的生长

• DOI: 10.1016/j.apcata.2020.117858
• 发表时间: 2020
• 期刊: Applied Catalysis A: General
• 作者: Ghosh, Arnab;Pham, Hien;Higgins, Jack;Van Swol, Frank;DeLaRiva, Andrew;Melton, Matthew;Kunwar, Deepak;Qi, Gongshin;Oh, Se H.;Wiebenga, Michelle
• 通讯作者: Wiebenga, Michelle

Investigating anomalous growth of platinum particles during accelerated aging of diesel oxidation catalysts

• DOI: 10.1016/j.apcatb.2020.118598
• 发表时间: 2020-06
• 期刊: Applied Catalysis B-environmental
• 影响因子: 22.1
• 作者: Deepak Kunwar;Cristhian Carrillo;Haifeng Xiong;E. Peterson;A. DeLaRiva;Arnab Ghosh;Gongshin Qi;Ming-Mei Yang;Michelle H. Wiebenga;S. Oh;Wei Li;A. Datye

Using a Combination of HAADF and SE Imaging to Locate Pt Nanoparticles within a Mesoporous Silica Diesel Oxidation Catalyst

结合使用 HAADF 和 SE 成像来定位介孔二氧化硅柴油氧化催化剂中的 Pt 纳米颗粒

• DOI: 10.1017/s143192761800898x
• 发表时间: 2018
• 期刊: Microscopy and Microanalysis
• 影响因子: 2.8
• 作者: Pham, Hien N.;Howe, Jane Y.;Ghosh, Arnab;Melton, Matthew;Kunwar, Deepak;Peterson, Eric J.;Datye, Abhaya K.
• 通讯作者: Datye, Abhaya K.

Design considerations for low-temperature hydrocarbon oxidation reactions on Pd based catalysts

• DOI: 10.1016/j.apcatb.2018.05.049
• 发表时间: 2018-11-15
• 期刊: APPLIED CATALYSIS B-ENVIRONMENTAL
• 影响因子: 22.1
• 作者: Xiong, Haifeng;Wiebenga, Michelle H.;Datye, Abhaya K.
• 通讯作者: Datye, Abhaya K.