Reactivation of industrial spent hydrocracking catalysts can reduce fresh catalyst consumption and hazardous waste emissions, generating significant economic and environmental benefits. However, seldom have reports on this subject been found. Herein, a solvent-induced coordinating method was developed to reactivate the industrial spent hydrocracking catalysts for tetralin selective hydrogenation and ring-opening to produce benzene, toluene, and xylene (BTX). The developed reactivation method could redisperse the aggregated Ni, Mo active phases and transform the inert β-NiMoO₄ phases into the type II NiMoS active phases after sulfidation. The newly formed NiMoS active phases bear 2–3 stacking layers and short stacking lengths over the reactivated catalyst. Besides, the porous structure is reconstructed by removal of the framework aluminum (FAL) and the extra-framework aluminum (EFAL) from the support, and the acidity of the reactivated catalyst is enhanced by the introduction of Beta zeolite. Compared with the spent catalysts, the hydrocracking performance of the reactivated catalysts shows a significant improvement. The tetralin conversion is 83% with a BTX selectivity of 48%, which is comparable to the performance of the freshly prepared catalysts reported in the literature. This work provides a new idea for the resource utilization of spent hydrocracking catalysts.

中文翻译：

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用于 Tetralin 选择性加氢和开环的工业废加氢裂化催化剂的再活化


工业废加氢裂化催化剂的再活化可以减少新催化剂的消耗和危险废物的排放，从而产生显著的经济和环境效益。然而，很少找到关于这个主题的报告。在此，开发了一种溶剂诱导的配位方法，以重新活化工业废加氢裂化催化剂，用于四丁烷选择性加氢和开环以生产苯、甲苯和二甲苯 （BTX）。开发的再活化方法可以重新分散聚集的 Ni、Mo 活性相，并在硫化后将惰性 β-NiMoO₄ 相转化为 II 型 NiMoS 活性相。新形成的 NiMoS 活性相在重新活化的催化剂上具有 2-3 层堆叠层和较短的堆叠长度。此外，通过从载体中去除框架铝 （FAL） 和框架外铝 （EFAL） 来重建多孔结构，并通过引入 β 沸石增强了再活化催化剂的酸度。与废催化剂相比，再活化催化剂的加氢裂化性能显著提高。四丁蛋白转化率为 83%，BTX 选择性为 48%，这与文献中报道的新鲜制备的催化剂的性能相当。这项工作为废油加氢裂化催化剂的资源化利用提供了新思路。