【摘要】 CoMoK/Al₂O₃耐硫水煤气变换催化剂中加入La₂O₃后其活性与含量和处理温度有关。含有0.5—1.0％La₂O₃的催化剂和载体经600℃处理活性和耐热性最高。在500℃进行强化反应后La助化的催化剂活性下降～50％,而无La的下降～70％。以H₂S/H₂重新处理减活后的催化剂可以使活性逐渐恢复,但含La的比不含La的恢复得快。由催化剂的硫化过程和程序升温还原及吡啶吸附实验未能发现两种催化剂有明显的区别。XPS测定结果发现La助化的催化剂在反应时,其Mo可以保持较好的分散和较少形成Mo⁶⁺,而Mo⁶⁺对反应是无活性的。更多还原

【Abstract】 A more active and heat resistant water gas shift catalyst Co Mo K/Al₂O₃ has beenobtained by modification of Al₂O₃ support with La₂O₃ （ranging from 0.5 to 1 wt. % basedon the catalyst） and aftertreatment at 600℃. La-promoted catalyst lost～50% of itsinitial activity after water gas shift reaction which is accelerated at 500℃, while theunpromoted catalyst lost～70%. The activity of deteriorated catalyst can be restored bytreatment with H₂S/H₂, but the rate of reactivation of the La-promoted is greater thanthat of the unpromoted. No obvious difference was found in the sulfidation of catalystwith H₂S/H₂ and temperature programmed reduction determination and pyridine adsorptionon sulfided catalyst. XPS data indicated that a better dispersion of Mo and less Mo⁶⁺formed during water gas shift reaction on the La-promoted catalyst.更多还原