对失活Co-Mo-K/Al2O3硫化物催化剂的剖析研究

• 作 者: 李玉敏 王立刚 王日杰 张继炎 张鎏
• 机 构: 天津大学化工学院!天津300072,天津大学化工学院!天津300072,天津大学化工学院!天津300072,天津大学化工学院!天津300072,天津大学化工学院!天津300072
• 出 处: 化学工业与工程
• 发表日期: 2001年05期
• 关键词: 水煤气变换反应 Co-Mo-K/Al2O3催化剂 失活 程序升温测硫

本文通过多种测试技术研究了工业Co -Mo -K Al2 O3 耐硫变换催化剂 ,失活样中各元素的存在状态、含量和物相变化。发现 ,在原催化剂中钾、硫从内部向表面迁移并有流失 ,γ -Al2 O3 转变为 (Al2 O3 ) 10R ,MoS2 、Co9S8变为含活性硫物种少的物相 ;从反应气中夹带的铁、铬、硅和镍杂质沉积在表面上。由此导致催化剂对H2 O和CO的吸附与反应能力的下降 ,最终造成严重失活。

In this paper, the industrial Co-Mo-K Al2 O3 sulfur-tolerant shift catalyst was studied by a variety of testing techniques. The existence state, content and phase change of each element in the inactivated sample were investigated. It was found that in the original catalyst potassium and sulfur migrated from the interior to the surface and lost, the γ -Al 2 O 3 was transformed into (Al 2 O 3) 10 R, MoS 2 and Co 9 S 8 into a phase containing less active sulfur species. From the entrained iron Chromium, silicon and nickel impurities deposit on the surface. As a result, the catalyst’s ability to adsorb and react with H 2 O and CO decreases, eventually resulting in serious inactivation.