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Synthesis of Tailored Nanoparticles for Palladium-Based Oxidation Catalysts.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Synthesis of Tailored Nanoparticles for Palladium-Based Oxidation Catalysts./
作者:	Feng, Yanyue.
面頁冊數:	1 online resource (67 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
Contained By:	Dissertations Abstracts International84-11B.
標題:	Crystal structure. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30402237click for full text (PQDT)
ISBN:	9798379477790

Synthesis of Tailored Nanoparticles for Palladium-Based Oxidation Catalysts.
Feng, Yanyue.

Synthesis of Tailored Nanoparticles for Palladium-Based Oxidation Catalysts. - 1 online resource (67 pages)

Source: Dissertations Abstracts International, Volume: 84-11, Section: B.

Thesis (Ph.D.)--Chalmers Tekniska Hogskola (Sweden), 2023.

Includes bibliographical references

The immense changes of physical and chemical properties of materials caused by the transition from microscale to nanoscale have been attracting scientific attention for decades. Rapid development of modern techniques triggers the attention on the multicomponent nanoparticle catalysts with enhanced catalytic activities. In this thesis, the Au Pd core shell system and the highly dispersed Pd/CeO2 and Pt/CeO2 are investigated to achieve highly active oxidation catalysts.The Au Pd core shell nanoparticles were synthesized by a two-step seeded growth method. The effects of temperature and Pd/Au molar ratio on the morphology of Au Pd core shell nanoparticles were studied. The effect of the Au core on the Pd surface properties was studied by systematically varying the core/shell ratio. Highly dispersed Pd/CeO2 and Pt/CeO2 were prepared by incipient wetness impregnation. High-resolution transmission electron microscopy (HRTEM), high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM), and energy-dispersive X-ray spectroscopy (EDS) line scanning were utilized to investigate the morphology of the nanoparticle catalysts. Chemical composition was measured by X-ray fluorescence (XRF), and the surface electron structure and chemical state were investigated by X-ray photoelectron spectroscopy (XPS). An environmental reaction cell was used to test the catalytic activity for the CO oxidation reaction. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was used to study the surface species during CO adsorption and CO oxidation reaction conditions.It is shown that Au Pd core shell nanoparticles with different Au core sizes and Pd shell thickness can be successfully synthesized and loaded onto alumina using precise synthesis conditions. Moreover, neither agglomeration nor destruction of the core shell motif under CO oxidation reaction conditions could be observed, indicating good structural stability. Further, in situ infrared spectroscopy reveals that palladium surface properties in core shell system differ to palladium only particles, suggesting electronic and structural modification of the Pd shell surface by the Au core. The Pd shell thickness exceed 0.5 nm as to be active for CO oxidation at low temperatures.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798379477790Subjects--Topical Terms:

3561040
Crystal structure.
Index Terms--Genre/Form:

542853
Electronic books.

Synthesis of Tailored Nanoparticles for Palladium-Based Oxidation Catalysts.
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520 $a The immense changes of physical and chemical properties of materials caused by the transition from microscale to nanoscale have been attracting scientific attention for decades. Rapid development of modern techniques triggers the attention on the multicomponent nanoparticle catalysts with enhanced catalytic activities. In this thesis, the Au Pd core shell system and the highly dispersed Pd/CeO2 and Pt/CeO2 are investigated to achieve highly active oxidation catalysts.The Au Pd core shell nanoparticles were synthesized by a two-step seeded growth method. The effects of temperature and Pd/Au molar ratio on the morphology of Au Pd core shell nanoparticles were studied. The effect of the Au core on the Pd surface properties was studied by systematically varying the core/shell ratio. Highly dispersed Pd/CeO2 and Pt/CeO2 were prepared by incipient wetness impregnation. High-resolution transmission electron microscopy (HRTEM), high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM), and energy-dispersive X-ray spectroscopy (EDS) line scanning were utilized to investigate the morphology of the nanoparticle catalysts. Chemical composition was measured by X-ray fluorescence (XRF), and the surface electron structure and chemical state were investigated by X-ray photoelectron spectroscopy (XPS). An environmental reaction cell was used to test the catalytic activity for the CO oxidation reaction. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was used to study the surface species during CO adsorption and CO oxidation reaction conditions.It is shown that Au Pd core shell nanoparticles with different Au core sizes and Pd shell thickness can be successfully synthesized and loaded onto alumina using precise synthesis conditions. Moreover, neither agglomeration nor destruction of the core shell motif under CO oxidation reaction conditions could be observed, indicating good structural stability. Further, in situ infrared spectroscopy reveals that palladium surface properties in core shell system differ to palladium only particles, suggesting electronic and structural modification of the Pd shell surface by the Au core. The Pd shell thickness exceed 0.5 nm as to be active for CO oxidation at low temperatures.
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