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Preparation of Supported PT-Based Mixed Nanoparticles and Their Catalytic Properties

Preparation of Supported PT-Based Mixed Nanoparticles and Their Catalytic Properties


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About the Book

This dissertation, "Preparation of Supported Pt-based Mixed Nanoparticles and Their Catalytic Properties" by Kwok-ying, Tsang, 曾幗瑛, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled PREPARATION OF SUPPORTED PT-BASED MIXED NANOPARTICLES AND THEIR CATALYTIC PROPERTIES submitted by TSANG KWOK YING for the degree of Doctor of Philosophy at The University of Hong Kong in September 2007 Selected Pt-based mixed nanoparticles were prepared and their catalytic properties were studied. Platinum-cobalt nanoparticles were prepared from water/Triton X-100/propanol- 2/cyclohexane reverse microemulsions. The Pt: Co ratio in the nanoparticles was controlled by the initial concentrations of Pt and Co in the precursor solution. The nanoparticles were characterized by transmission electron microscopy, x-ray diffractometry and energy dispersive x-ray analysis. The Pt-Co nanoparticles supported on a carbon electrode possessed high dispersion and high catalytic activity for methanol oxidation in alkaline solution at room temperature. The optimum Pt: Co ratio for methanol oxidation was determined to be 1:0.5. A method to prepare supported nanoparticles of Pt-WO with composition control in nanoscale was developed. Transmission electron microscopy showed crystalline domains in the nanoparticles, which had a narrow size distribution. Energy dispersive x-ray analyses performed in different regions showed good uniformity in the Pt: W ratio, which correlated linearly with the Pt: W ratio in the precursor. Platinum was mostly present in the pure metallic state whereas tungsten is in the +6 oxidation state, as revealed by x-ray iphotoelectron spectroscopy. The Pt-WO nanoparticles supported on Vulcan XC 72 carbon exhibited high activity for methanol oxidation at room temperature. The electrocatalytic activity varied with the Pt: W ratio with an optimum at 1:1. At this ratio, the activity is better than a commercial PtRu/C catalyst of equivalent platinum loading. Some Pt/Ru nanoparticles supported on Vulcan-72 carbon were also prepared by the colloidal method and mixed with Bi O . The prepared Pt/Ru/Bi O nanoparticles were 2 3 2 3 characterized by EDX, TEM and XPS. Their catalytic activities towards formic acid decomposition were studied. The rate of gas generation was measured and the gaseous products were analyzed by gas chromatography. Pt/Ru/Bi O nanoparticles showed high 2 3 activity and selectivity towards the dehydrogenation of formic acid. A composition of Pt: Ru: Bi O is 3:1:3 showed the highest activity. 2 3 ii DOI: 10.5353/th_b3963418 Subjects: Nanoparticles Catalysts


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Product Details
  • ISBN-13: 9781361426562
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 174
  • Weight: 694 gr
  • ISBN-10: 136142656X
  • Publisher Date: 27 Jan 2017
  • Binding: Hardback
  • Language: English
  • Spine Width: 11 mm
  • Width: 216 mm


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