Regeneration of Spent Catalysts by H2O2 Chemical Treatment

Regeneration of Spent Catalyst and Impregnation of Catalyst by Supercritical Fluid

“…Along with the rapid development and wide application of catalysis technology, the amounts of different spent catalysts are increased from year to year [14]. In addition, catalysts have thus become more and more sophisticated and one indirect consequence is that they need more careful procedures for regeneration than in the past.…”

“…The spent catalysts are generally treated as harmless industrial waste, but their characteristics are varied in different processes and condition [14]. If the spent catalysts can be regenerated and activated effectively, they can be reused with higher values and economic efficiency [14].…”

“…The main function of these solutions in catalyst regeneration is to remove the blocked carbons or poisoned residues from the spent catalysts. The effects of various chemical reagents, concentrations, and operating conditions on catalyst regeneration vary with different spent catalysts (active metals and compositions)[14] [19].Oil refining and petrochemical plants are currently undergoing serious challenges from a technical and economical point of view, as well as from an environmental point of view[28].This document will provide a brief overview of the management practices and regeneration of spent catalysts, with the focus on the technologies, issues and opportunities related to the preservation of the environment[17].The spent catalysts which were regenerate in this study, are commercial catalysts un-loaded from different type of industrial units, developed by Nizhnekamsk Chemical Industries, Nizhnekamsk, Russia. Most of the data presented here were obtained in the laboratories of Kazan National Research Technological University, in Russia.…”

Valorization of Recycled Honeycombs from Exhausted TWCs by Means of Their Use as a Support of MnOx Catalysts for Acetone Combustion

“…This avoids the area of structural deterioration of the sample. It was then chemically and thermally treated to remove possible remaining poisons [32][33][34]. The treatment consisted of submerging M in a 0.1 M citric acid (Sigma Aldrich, 98.5% pure) solution for 30 min and then leaving it in distilled water for 10 min.…”