The Effect of Sulphur and Water Treatments on the Performance of Pd/β-Zeolite Diesel Oxidation Catalysts

Abstract

Sulphur, sulphur-water, and water pretreatments were done to find out the effect of these compounds on a diesel oxidation Pd/b-zeolite catalyst and b-zeolite washcoat. After pretreatments, the samples were analysed by BET, XRF, TEM-SEM, and XPS. In addition, the activity of fresh and pretreated Pd/b-zeolite catalysts was studied utilizing the by Gasmet FT-IR in production gas analysis. Sulphur compounds (SO 2 or -SO 4 ) were found to have a deactivating effect on the activity of the studied Pd/b-zeolite catalyst.

Propene and CO oxidation on Pt/Ce-Zr-SO 4 2– diesel oxidation catalysts: Effect of sulfate on activity and stability

“…These catalysts have been studied extensively to improve their activi-ty and stability. DOCs have been used to convert unburned CO and hydrocarbons to carbon dioxide and water [10][11][12][13]. DOCs can also oxidize nitrogen monoxide to nitrogen dioxide, which is beneficial for de-NOx activity of the fast SCR reaction and the oxidation of soot collected by the diesel particulate filters downstream [14,15].…”