Effect of sulfur on the performance and on the particle size and location of platinum in Pt/KL hexane aromatization catalysts
Effect of sulfur on the performance and on the particle size and location of platinum in Pt/KL hexane aromatization catalysts
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DOI：
10.1006/jcat.1993.1006
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发表时间：
1993
影响因子：
7.3
通讯作者：
G. Mcvicker;J. Kao;J. J. Ziemiak-J.;W. Gates;J. Robbins;M. Treacy;S. Rice;T. H. Vanderspurt;V. R. Cross;A. Ghosh
中科院分区：
文献类型：
--
作者：
G. Mcvicker;J. Kao;J. J. Ziemiak-J.;W. Gates;J. Robbins;M. Treacy;S. Rice;T. H. Vanderspurt;V. R. Cross;A. Ghosh
抽出硫磺，引入到工作铂/千升。正己烷芳构化催化剂以噻吩型的形式，通过减少KL沸石通道内可访问的铂位的数量，起到了极强的毒害作用。然而，催化剂上硫的存在并没有显著改变通道内铂中心的本征催化活性和选择性。在50-200WPPB范围内，极低的噻吩硫浓度会加速铂的团聚。催化剂失活主要由金属团聚引起，最有可能的原因是小(10-20A)铂和/或铂-硫团簇对KL通道的多重堵塞。
Abstract Sulfur, introduced to a working Pt/KL. hexane aromatization catalyst in the form of thiophene, functions as an extremely potent poison by reducing the number of Pt sites accessible within the channels of the KL zeolite. The intrinsic catalytic activity and selectivity of in-channel Pt sites, however, is not significantly modified by the presence of sulfur on the catalyst. Extremely low thiophene feed sulfur concentrations in the 50-200 wppb range accelerate Pt agglomeration. Catalyst deactivation, resulting primarily from metals agglomeration, most likely occurs by multiple blockage of KL channels by small (10-20 A) Pt and/or Pt-sulfur clusters.