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研究生:王毓芳
研究生(外文):Wang, Yu-Fang
論文名稱:鉑/碳及鉑-釕/碳觸媒之製備及催化研究
論文名稱(外文):Carbon Supported Pt and Pt-Ru Catalyst: Preparation and Catalysis
指導教授:張仁瑞林修正林修正引用關係
指導教授(外文):Zhang, Ren-RuiLin, Xiu-Zheng
學位類別:碩士
校院名稱:國立中正大學
系所名稱:化學工程研究所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:87
中文關鍵詞:支撐式鉑觸媒支撐式鉑-釕觸媒氧化反應程溫還原X射線吸收光譜快速傅立葉轉換紅外線光譜程溫還原化學工程化學
外文關鍵詞:supported Pt catalystsupported Pt-Ru catalystoxidation reactiontemperature-programmed-reductionX-ray absorption spectroscopyfast Fourier transform infrared spectroscopyCHEMICAL-ENGINEERINGCHEMISTRY
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摘要 本
研究的主要目的在於製備甲醇燃料電池及乙醛氧化反應所 用的Pt/C及Pt-
Ru/C觸媒。乙醛氧化反應在溫度40℃,壓力 520psig下的連續式固
定床反應系進行。新鮮及反應過後的觸媒並經由一氧化碳化學吸附(CO
Chemisorption)、快速傅立葉轉換 紅外線光譜(FFT-IR)、程式化升溫
還原(TPR)以及Extended X-rey Absorption Fine Structure (EXAFS
)、原子吸收光譜 (AA)分析其物理及化學性質。由反應及特性分析之
結果我們歸 納出以下的結論:

(1)由於擔體之疏水性,觸媒製備過程中所加水量愈少,其分散 度愈佳
。 (2)觸媒之分散
度愈佳,所得之觸媒顆粒愈小,其堆積結構愈往 三度空間堆積。

(3)Pt/C新鮮觸媒之分散性以200℃還原之Pt/C觸媒最佳,300 ℃的次
之,450℃的最差,然而在反應系統中,系統達穩定 時卻以300℃還
原之Pt/C觸媒之性能最佳,乃是由於鉑金 屬溶解、金屬聚集及氧
化性質妥協之結果。 (4)在以Pt/C為觸媒之乙醛不均
相反應系統中,觸媒僅有表層 被氧化。

(5)在有無雙金屬交互作用之Pt-Ru/C用於乙醛不均相反應系統 中之主
要差異在於水量之產率(不具雙金屬交互作用的水量 產率較多)。

(6)我們所製備之Pt-Ru/C觸媒無法預防金屬觸媒被產物所溶解 出來的
問題。
Abstract

The goals of this research were to prepare cabon supported Pt
and Pt- Ru catalysts for methanol fuel cell and for
oxidation of acetaldehyde. The oxidation reaction of
acetaldehyde were carried out with a continous fix bed reactor
at 40℃and 520psig. Both fresh and the reacted catalysts were
characterized by CO chemisorption , fast Fourier transform
infrared (FFT-IR) spectroscopy, temperature programmed
reduction (TPR), atomic absorption spectroscopy (AA), and
extended X-ray absorption fine structure (EXAFS). Together
with the reaction and characterization results, the following
conclusions were obtained regarding the structure and catalytic
performance of the catalysts:

(1) The despersion of the catalyst was increased with decreasing
the amount of water used for the preparation because of the
hydrophorbic properties of carbon supports.

(2) The catalysts with the highest metal dispersion have the
metal particles with morphology characterizing three dimension.

(3) For the fresh carbon-supported Pt catalysts, the highest Pt
dispersion is the catalyst reduced at 200℃, the 300℃ in the
middle, the lowest is the catalyst reduced at 450℃.
However, the catalyst reduced at 300℃ presents the
best performance. The results is the compromise between Pt
metal dissoluted, metal migration and oxidation of metal
particles. (4)During the oxidation reaction, only
surface has been oxidized. (5)The main difference of
the catalytic performance between the Pt-Ru/C catalyst
with and without bimetallic interactions is over-oxidation
reaction ; the catalysts without bimetalic interactions has more
water yield.

(6) The addition of Ru to the Pt catalysts has no improvement in
metal dissoluted problem.
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