低压合成甲醇催化剂的TPR研究

• 作 者: 李玉敏 张继炎 王嘉福 张鎏
• 机 构: 天津大学化学工程系,天津大学化学工程系,天津大学化学工程系,天津大学化学工程系
• 出 处: 天津大学学报
• 发表日期: 1986年04期
• 关键词: 甲醇催化剂 TPR 程序升温还原 甲醇合成催化剂 还原动力学 五氧化二钒 催化剂结构 原前 还原性能 成核机理

对CuO-ZnO-Al_2O_3-V_2O_5低压合成甲醇催化剂进行了TPR(程序升温还原)研究。结果表明还原过程经历了慢速到快速再到慢速的三个阶段,此过程属于成核机理并有诱导期。还原时采用低H_2浓度、高空速、低升温速度对取得高活性、高选择性有利。对TPR谱图作数学解析,得到了催化剂的还原反应动力学方程。研究中发现催化剂还原前予经煅烧会降低其选择性。催化剂中各组分间存在有强相互作用。本文还初步探讨丁V_2O_5对催化剂结构及还原性能的影响。

The CuO-ZnO-Al_2O_3-V_2O_5 low-pressure methanol synthesis catalyst was studied by TPR (temperature programmed reduction). The results show that the reduction process has gone through three stages: slow to fast and then slow. This process belongs to the nucleation mechanism and has an induction period. Reduction with low H 2 concentration, high airspeed, low heating rate for high activity, high selectivity and favorable. The TPR spectra were analyzed mathematically, and the kinetic equation of the reduction reaction of the catalyst was obtained. The study found that the reduction of the catalyst before calcination will reduce its selectivity. There is a strong interaction between the components in the catalyst. This article also preliminary study Ding Ding V_2O_5 on the catalyst structure and reduction performance.