Theoretical Analysis of Sulfur Exchange Experiments
Theoretical Analysis of Sulfur Exchange Experiments
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DOI：
10.1006/jcat.2001.3314
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发表时间：
2001-10
影响因子：
7.3
通讯作者：
F. Massoth;T. Koltai;P. Tétényi
中科院分区：
文献类型：
--
作者：
F. Massoth;T. Koltai;P. Tétényi
摘要 采用流动再循环同位素示踪法测定了多种催化剂的硫吸收和硫交换，这些催化剂由负载在氧化铝上的 Mo、W、Ni、Co、Pd 和 Pt 的组合组成。通过考虑吸附和交换平衡，推导了计算硫化催化剂中硫异质交换程度和可交换硫分数的基本方程。交换平衡是通过从相反方向接近交换来实验建立的。不同催化剂的硫吸收和交换程度存在差异。在所有情况下，可交换硫均小于总硫含量。提出可交换硫的分数与基本MoS 2 颗粒的边缘S与总S的比率有关。在此基础上，通过应用平板模型来估计平均MoS 2 平板尺寸。可交换硫的量与催化剂的噻吩加氢脱硫活性有相当好的相关性。
Abstract A flow recirculation, isotopic tracer method was employed to determine sulfur uptake and sulfur exchange for a number of catalysts consisting of combinations of Mo, W, Ni, Co, Pd, and Pt, supported on alumina. By considering adsorption and exchange equilibria, basic equations were derived for calculation of extent of sulfur heteroexchange and fraction of exchangeable sulfur in the sulfided catalysts. Exchange equilibrium was experimentally established by approaching exchange from opposite directions. Variations in sulfur uptake and extent of exchange were obtained for the different catalysts. In all cases, the exchangeable sulfur was less than the total sulfur content. It is proposed that the fraction exchangeable sulfur is related to the edge S to total S ratio of the basic MoS 2 particles. On this basis, average MoS 2 slab sizes were estimated by application of slab models. The amount of exchangeable sulfur correlated reasonably well with thiophene hydrodesulfurization activity of the catalysts.