The Study of Electroless Copper Catalyst Prepared with Different Chelating Agents and Their Activity on Dehydrogenation of Butanol

• Main Authors: Yang, Chin Fu, 楊清富
• Other Authors: Chang, Hsin Fu
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/76860048362712604551

碩士 === 逢甲大學 === 化學工程研究所 === 83 === The properties of the Cu catalyst depends upon the kind of chelating agents in the preparing process. Two different chelating agents,ethylenediaminetetraacetic acid (EDTA) and triethanolamine (TEA),were individually used to prepare seven different cotents of Cu on γ-alumina support (8.44 ∼24.56 wt%) by EDTA and (7.09∼25.92 wt%) by TEA using the electroless Cu plating method. The dispersion of Cu particle on γ-alumina support and the crystalline phase of catalyst were characterized by Scanning Electron Micrography (SEM) and X-ray Diffraction (XRD) respectively. The Cu surface area and the acidity of catalyst were determined individually by the chemisorption of nitrous oxide and ammonia using the volume adsorption method in a vacuum apparatus. The catalyst activity to the dehydrogenation reaction of butanol at the range of 200℃ ∼300℃ was carried out in a fixed-bed flow micro-reactor and the products were analyzed by an on-line gas chromatography (GC) using a flame ionization detector (FID). The experiment results showed that both the dehydration and dehydrogenation occurred simultaneously. At the same reaction temperature,the conversion of 2-butanol was higher than that of 1-butanol. The conversion increased not only with temperature but also with the Cu surface area. Cu dispersed homogeneously over the γ- alumina support by using EDTA as chelating agent,resulting in a higher surface area and higher conversion of butanol;however,Cu aggregated on the γ-alumina support by using TEA as chelating agent,displaying a lower surface area and lower conversion. The dehydration dominated the reaction when the reaction temperature was raised beyond 340℃. The dehydration acitivity was highly dependent on the distribution of the acidic sites over the γ-alumina support. When the surface of γ-alumina support was covered by Cu,the acidity of the catalyst decreased coincidentally.