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本文研究在氧化铝表面上,高分散度多金属值化剂金属相互作用和反应性能的关系。以正庚烷和甲基环戊烷为原料,模拟重整的芳构化和加氢裂解反应。发现在铂值化剂中加入金时甲基环戊烷氢解活性下降,芳构化选择性提高。在铱催化剂中加入金时,则氢解括性明显地提高,脱氢环化选择性下降。而铂、铱、金三元催化剂在芳构化选择性和稳定性方面都优于双组份或单组份催化剂。上述结果表明,各种金属的相互影响所产生的复杂效果对多金属催化剂选择性和稳定性的改变起重要作用。
This paper investigates the relationship between the metal interaction and the reactivity of a highly dispersive multimetallicizer on an alumina surface. Using n-heptane and methylcyclopentane as starting materials, the aromatization and hydrocracking reactions were simulated. It is found that the hydrogenolysis activity of methylcyclopentane decreases when gold is added to the platinum value increasing agent, and the selectivity of aromatization increases. Addition of gold to the iridium catalyst significantly increases hydrogenolysis selectivity and decreases dehydrocyclization selectivity. However, platinum, iridium and gold ternary catalysts are superior to two-component or one-component catalysts in aromatization selectivity and stability. The above results show that the complex effect of the interaction of various metals plays an important role in the change of selectivity and stability of the multimetallic catalysts.