| 钌基氨合成催化剂氢氮吸附性能的研究 |
| |
| 引用本文： | 祝一锋,李小年,高冬梅,周春晖,刘化章.钌基氨合成催化剂氢氮吸附性能的研究[J].中国化学工程学报,2003,11(1):15-18. |
| |
| 作者姓名： | 祝一锋 李小年 高冬梅 周春晖 刘化章 |
| |
| 作者单位： | Instituteof Catalysis，Zhejiang University of Technology，Zhejiang Key Laboratory of Heterogeneous Catalysis，Instituteof Catalysis，Zhejiang University of Technology，Zhejiang Key Laboratory of Heterogeneous Catalysis，Instituteof Catalysis，Zhejiang University of Technology，Zhejiang Key Laboratory of Heterogeneous Catalysis，Instituteof Catalysis，Zhejiang University of Technology，Zhejiang Key Laboratory of Heterogeneous Catalysis，Instituteof Catalysis，Zhejiang University of Technology，Zhejiang Key Laboratory of Heterogeneous Catalysis Hangzhou 310014，China，Hangzhou 310014，China，Hangzhou 310014，China，Hangzhou 310014，China，Hangzhou 310014，China |
| |
| 基金项目： | Supported by the Natural Science Foundation of Zhejiang Province (No. 299015), the Development Plan of Youth Mainstay Teacher of the Education Ministry of China and the Special Foundation for Youth Talent by Zhejiang (RC9702). |
| |
| 摘 要： | The effects of promoters K, Ba, Sm on the chemisorption and desorption of hydrogen and nitrogen, dispersion of metallic Ru and catalytic activity of active carbon (AC) supported ruthenium catalyst for ammonia synthesis have been studied by means of pulse chromatography, temperature-programmed desorption, and activity test. Promoters K, Ba and Sm increased the activity of Ru/AC catalysts for ammonia synthesis significantly, and particularly, potassium exhibited the best promotion on the activity because of the strong electronic donation to metallic Ru. Much higher activity can be obtained for Ru/AC catalyst with binary or triple promoters. The activity of Ru/AC catalyst is dependent on the adsorption of hydrogen and nitrogen. The high activity of catalyst could be ascribed to strong dissociation of nitrogen on the catalyst surface. Strong adsorption of hydrogen would inhibit the adsorption of nitrogen, resulted in decrease of the catalytic activity. Ru/AC catalyst promoted by Sm2O3 shows the best dispers
|
| 关 键 词： | 合成氨 钌基催化剂 氢 氮 吸附性能 化学吸附 催化性能 |
| 修稿时间： | |
Study on Chemisorption and Desorption of Hydrogen and Nitrogen on Ru-based Ammonia Synthesis Catalyst |
| |
| Zhu Yifeng,LI Xiaonian,Zhou Chunhui,GAO Dongmei,LIU Huazhang.Study on Chemisorption and Desorption of Hydrogen and Nitrogen on Ru-based Ammonia Synthesis Catalyst[J].Chinese Journal of Chemical Engineering,2003,11(1):15-18. |
| |
| Authors: | Zhu Yifeng LI Xiaonian Zhou Chunhui GAO Dongmei LIU Huazhang |
| |
| Affiliation: | Institute of Catalysis, Zhejiang University of Technology, Zhejiang Key Laboratory of Heterogeneous Catalysis,Hangzhou 310014, China |
| |
| Abstract: | The effects of promoters K, Ba, Sm on the chemisorption and desorption of hydrogen and nitrogen, dispersion of metallic Ru and catalytic activity of active carbon (AC) supported ruthenium catalyst for ammonia synthesis have been studied by means of pulse chromatography, temperature-programmed desorption, and activity test. Promoters K, Ba and Sm increased the activity of Ru/AC catalysts for ammonia synthesis significantly, and particularly, potassium exhibited the best promotion on the activity because of the strong electronic donation to metallic Ru. Much higher activity can be obtained for Ru/AC catalyst with binary or triple promoters. The activity of Ru/AC catalyst is dependent on the adsorption of hydrogen and nitrogen. The high activity of catalyst could be ascribed to strong dissociation of nitrogen on the catalyst surface. Strong adsorption of hydrogen would inhibit the adsorption of nitrogen, resulted in decrease of the catalytic activity. Ru/AC catalyst promoted by Sm2O3 shows the best dispersion of metallic Ru, since the partly reduced SmOx on the surface modifies the morphology of active sites and favors the dispersion of metallic Ru. The activity of Ru/AC catalysts is in accordance to the corresponding amount of nitrogen chemisorption and the desorption activation energy of nitrogen. The desorption activation energy for nitrogen decreases in the order of Ru>Ru-Ba>Ru-Sm>Ru-Ba-Sm>Ru-K>Ru-K-Sm>Ru-K-Ba>Ru-K-Ba-Sm, just opposite to the order of catalytic activity, suggesting that the ammonia synthesis over Ru-based catalyst is controlled by the step of dissociation of nitrogen. |
| |
| Keywords: | ruthenium catalyst ammonia synthesis chemisorption desorption |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《中国化学工程学报》浏览原始摘要信息 |
|
点击此处可从《中国化学工程学报》下载全文 |
|
