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本文以正庚烷和甲基环戊烷在500℃、常压下的重整反应为例,在脉冲微反装置上研究了焙烧、浸渍方法、稀土元素的引入、予硫化等对铂?催化剂性能的影响。结果表明,高温焙烧导致裂解选择性增加,芳构选择性下降;金属组分浸渍在部分担体上再与另外分担体机械混合制得的催化剂和担体全部浸渍的催化剂比较,前者裂解选择性低,异构选择性高。催化剂的予硫化可显著降低铂铼稀土催化剂的裂解选择性,提高异构和芳构选择性。另外,由电镜观察表明,稀土元素的引入,使表面金属原子集合体变小,从而有利于铂粒子的分散,对芳构化反应有利。
In this paper, the reforming reaction of n-heptane and methylcyclopentane at 500 ℃ and atmospheric pressure was taken as an example. The effects of calcination, impregnation method, introduction of rare earth elements, The impact of performance. The results show that the high temperature calcination results in the increase of the cracking selectivity and the decrease of the aromatic selectivity. The metal component is impregnated on some of the supports and then compared with the catalyst prepared by mechanical mixing of the other supports and the fully impregnated catalyst. The former has low cracking selectivity, Heterogeneous selectivity. Pre-sulfidation of the catalyst can significantly reduce the cracking selectivity of the platinum-rhenium rare earth catalyst and improve the isomerization and aromatization selectivity. In addition, the observation by electron microscopy shows that the introduction of rare earth elements makes the surface metal atom assembly smaller, which is favorable for the dispersion of platinum particles and is favorable for the aromatization reaction.