An Experimental Investigation of the Reactivation of Coked Catalysts under Supercritical Fluid Conditions

本项目的目的是通过实验研究 用超临界流体对结焦催化剂进行再活化 (SCF)溶剂. 具体而言，以下几点是 解决：（a）超临界流体溶剂在萃取中的有效性如何 多孔催化剂中的焦炭生成化合物 (b)吗 可以通过周期性地在原位保持催化剂活性 用超临界流体溶剂萃取成焦化合物， 防止焦炭在催化剂中的任何积聚？ 这些 通过系统的实验解决问题 铂/γ-氧化铝催化的 1-己烯异构化--一个反应体系， 同时通过焦化失活。 进行反应 在高压釜反应器中，当进行催化剂再活化时， 在高压平衡池中。 所用的SCF溶剂是 超临界二氧化碳 除了在催化剂中进行催化剂再活化的可能性之外， 此外，建议的活化计划亦在 与传统的相比， 处理. 因此，催化剂的任何热失活， 支持最小化。 成功完成该项目 应该能激发出设计新能源的潜力， 有效的催化剂再活化方案。 此外，信息 从这项研究中也有应用的理解， 超临界流体从固体中萃取低分子量组分 煤或任何多孔基质。

The objective of this project is to experimentally investigate the reactivation of coked catalysts using supercritical fluid (SCF) solvents. Specifically, the following points are addressed: (a) How effective is an SCF solvent in the extraction of coke forming compounds from a porous catalyst? (b) Is it possible to maintain catalyst activity in situ by periodically extracting the coke-forming compounds with an SCF solvent, thus preventing any accumulation of coke in the catalyst? These questions are addressed through systematic experimental investigations of the platinum/gamma-alumina-catalyzed isomerization of 1-hexene -- a reaction system that undergoes simultaneous deactivation by coking. The reaction is carried out in an autoclave reactor, while catalyst reactivation is performed in a high-pressure equilibrium cell. The SCF solvent employed is supercritical carbon dioxide. Besides the possibility of performing catalyst reactivation in situ, the proposed reactivation scheme also operates at relatively mild temperatures as compared to conventional processing. Hence any thermal deactivation of the catalyst and support is minimized. Successful completion of this project should bring out the potential for devising novel, energy- efficient catalyst reactivation schemes. Besides, information from this research also has application in the understanding of SCF extraction of lower molecular-weight constituents from solid coal or any porous matrix in general.