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在微反装置上,利用正庚烷、甲基环戊烷等模型化合物,对以机械混合方式将Ir/γ-Al_2O_3引入单铂和双金属重整催化剂后的催化剂进行反应,考察了Ir/γ-Al_2O_3的引入对催化剂活性、选择性和稳定性的影响。机械混合催化剂的芳构化选择性比共浸催化剂高。机械混合的Ir/γ-Al_2O_3对单铂、铂锡和铂铼催化剂的稳定性也有改善作用,同时还可以提高铂铼催化剂的抗硫中毒能力.试验表明,双金属催化剂中引入铱后,五元环开环裂解活性增加较多,开环的部位也发生了变化初步认为,铱提高催化剂的稳定性的原因主要是发挥了铱自身较强的氢溢出能力和加氢裂解性能较强的特点,使得一些容易生成焦炭的反应中间物经过加氢裂解而除去.本文还利用程序升温还原技术对机械混合和共浸铂铱催化剂进行了初步考察.
Ir / γ-Al 2 O 3 was introduced into the catalysts of single-platinum and bimetallic reforming catalysts by means of mechanical mixing of model compounds such as n-heptane and methylcyclopentane on the micro-reactor. The effects of Ir / Effect of γ-Al_2O_3 Addition on Catalytic Activity, Selectivity and Stability. Mechanical hybrid catalysts have higher aromatization selectivity than co-impregnated catalysts. Mechanical mixing of Ir / γ-Al 2 O 3 on platinum, platinum-tin and platinum rhenium catalysts also improve the stability of the role, but also can improve the platinum rhenium catalyst anti-sulfur poisoning test results show that bimetallic catalyst after the introduction of iridium, five The open-loop cracking activity of the ring increases more, and the ring-opened sites also change. It is preliminarily believed that the reason for increasing the stability of the catalyst by iridium is mainly that it exerts its strong hydrogen spillover ability and strong hydrocracking performance , So that some reaction intermediates that are easy to generate coke are removed by hydrocracking.In this paper, a preliminary investigation of mechanical mixing and co-impregnation of platinum-iridium catalysts was also carried out by the program of temperature reduction and reduction.