Abstract

The results of the working stability studies of cobalt catalysts based on SiO₂ and Al₂O₃ promoted with Re and Al₂O₃ in the synthesis of hydrocarbons from CO and H₂ in continuous tests for 200–300 h are presented. The prepared catalysts were characterized by transmission electron spectroscopy, temperature-programmed reduction with hydrogen, temperature-programmed desorption of CO, and X-ray fluorescence spectroscopy and tested at a temperature 200°C, a pressure of 0.1 MPa, and a GHSV of 100 h^–1. It was determined that a cobalt–silica catalyst promoted with Al₂O₃ had the highest activity. It was established that the addition of Al₂O₃ to a cobalt–silica catalyst increased the conversion of CO and selectivity for C₅₊ hydrocarbons and inhibited the agglomeration of Co particles under the action of a reaction atmosphere in the Fischer–Tropsch synthesis. It was found that the initial conversion of CO increased by a factor of 2 upon the introduction of 0.1 wt % rhenium into the Co/γ-Al₂O₃ catalyst; however, the rate of its deactivation increased in this case due to an almost twofold increase in the size of cobalt particles in the course of synthesis after operation for 300 h.

中文翻译：

---

稀土元素和Al 2 O 3的促进作用对费托合成钴催化剂工作稳定性的影响

摘要

基于SiO钴催化剂的工作稳定性研究的结果₂和Al ₂ ö ₃随Re和Al促进₂ ö ₃在从CO和H的烃的合成₂在连续试验200-300 h的呈现。通过透射电子光谱，氢的程序升温还原，CO的程序升温脱附和X射线荧光光谱对所制备的催化剂进行表征，并在200°C，0.1 MPa的压力和GHSV为100的条件下进行了测试。 h ^–1。经确定，Al ₂ O _3可促进钴-硅催化剂活动最高。已经确定，在钴-二氧化硅催化剂中添加Al ₂ O ₃可以提高费-托合成过程中反应气氛下CO的转化率和对C ₅₊烃的选择性，并抑制Co颗粒的团聚。结果发现，CO的初始转换时引入0.1重量％的铼的进入的Co /γ-Al系增加了2倍₂ ö ₃催化剂; 然而，在这种情况下，其失活速率增加是由于在操作300小时后合成过程中钴颗粒的尺寸几乎增加了两倍。