Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1021/es800330s
Title (Primary) Permanganate oxidation of sulfur compounds to prevent poisoning of Pd catalysts in water treatment processes
Author Angeles-Wedler, D.; Mackenzie, K. ORCID logo ; Kopinke, F.-D.
Source Titel Environmental Science & Technology
Year 2008
Department TUCHEM
Volume 42
Issue 15
Page From 5734
Page To 5739
Language englisch
Abstract The practical application of Pd-catalyzed water treatment processes is impeded by catalyst poisoning by reduced sulfur compounds (RSCs). In this study, the potential of permanganate as a selective oxidant for the removal of microbially generated RSCs in water and as a regeneration agent for S-poisoned catalysts was evaluated. Hydrodechlorination using Pd/Al2O3 was carried out as a probe reaction in permanganate-pretreated water. The activity of the Pd catalysts in the successfully pretreated reaction medium was similar to that in deionized water. The catalyst showed no deactivation behavior in the presence of permanganate at a concentration level =0.07 mM. With a residual oxidant concentration of =0.08 mM, a significant but temporary inhibition of the catalytic dechlorination was observed. Unprotected Pd/Al2O3, which had been completely poisoned by sulfide, was reactivated by a combined treatment with permanganate and hydrazine. However, the anthropogenic water pollutants thiophene and carbon disulfide were resistant against permanganate. Together with the preoxidation of catalyst poisons, hydrophobic protection of the catalysts was studied. Pd/zeolite and various hydrophobically coated catalysts showed a higher stability against ionic poisons and permanganate than the uncoated catalyst. By means of a combination of oxidative water pretreatment and hydrophobic catalyst protection, we provide a new tool to harness the potential of Pd-catalyzed hydrodehalogenation for the treatment of real waters.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=741
Angeles-Wedler, D., Mackenzie, K., Kopinke, F.-D. (2008):
Permanganate oxidation of sulfur compounds to prevent poisoning of Pd catalysts in water treatment processes
Environ. Sci. Technol. 42 (15), 5734 - 5739 10.1021/es800330s