化工学报2016，Vol.67Issue(7)：2793-2798,6.DOI:10.11949/j.issn.0438-1157.20160160
Pd-Pb/SiO2催化高浓度乙烯基乙炔加氢合成丁二烯
Hydrogenation of high-concentration monovinylacetylene for butadiene production over Pd-Pb/SiO2 catalysts
张一科 1贾则琨 1张帅 1甄彬 1韩明汉2
作者信息
- 1. 清华大学化学工程系，北京 100084
- 2. 天津理工大学化学化工学院，天津 300384
- 折叠
摘要
Abstract
The hydrogenation of high-concentration monovinylacetylene over silica supported Pd-Pb bimetallic catalysts was investigated. It showed that the appropriate presence of Pb can prevent Pd nanoparticles from aggregation, hence facilitated the improvement of catalytic activity, i.e. the optimal molar ratio of Pb to Pd of 0.2. With the molar ratio of Pb to Pd above 0.2, Pd-Pb alloy can be formed, which causes catalytic activity loss. The positive correlation between the catalytic activity and the electron bonding energy of Pd 3d was manifested by X-ray photoelectron spectra. The temperature for PdO reduction exhibited a remarkable influence on the structure and the activity of the catalysts. The PdO reduction at 350℃ of the catalyst was incomplete thus with low activity. At 450℃ of the reduction temperature, it caused Pd nanoparticle sintering, hence with low activity and low butadiene selectivity. As a result, the optimal reduction temperature was 400℃. After 40 h, the catalyst was deactivated due to the blockage of pore by coke formation on catalyst surface. Subsequently, the improvement of anti-coking ability and the lifetime of the catalyst will be of interest.关键词
加氢/催化剂/催化/乙烯基乙炔/丁二烯Key words
hydrogenation/catalysts/catalysis/monovinylacetylene/butadiene分类
化学化工引用本文复制引用
张一科,贾则琨,张帅,甄彬,韩明汉..Pd-Pb/SiO2催化高浓度乙烯基乙炔加氢合成丁二烯[J].化工学报,2016,67(7):2793-2798,6.
