The effect of Pt/Pd ratio on the oxidation activity and resistance to sulfur poisoning for Pt-Pd/BEA diesel oxidation catalysts with high siliceous content. Issue 4 (August 2022)

• Record Type: Journal Article
• Authors: Ho, Phuoc Hoang; Shao, Jieling; Yao, Dawei; Ilmasani, Rojin Feizie; Salam, Muhammad Abdus; Creaser, Derek; Olsson, Louise
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 4(2022)
• Publication Date: 2022-08
• Subjects: Diesel oxidation catalysts -- PtPd alloy -- Pt/Pd ratios -- Sulfur poisoning -- High siliceous zeolites; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.108217
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: This study investigates the effect of the Pt/Pd ratio on the oxidation activity and sulfur poisoning/regeneration of diesel oxidation catalysts (DOC) using beta zeolites with high siliceous content as support. Formation of Pt-Pd alloy leads to contraction of the cell lattice of Pt in the bimetallic catalysts, improving not only the sintering resistance of Pt but also retaining a high fraction of Pd in Pd 2+ form. Moreover, the Pt-Pd alloy also improves the oxidation resistance of the particles, which enhances the activity of the catalysts for CO and C3 H6 oxidation. Bimetallic catalysts also favor NO reduction at a lower temperature than the monometallic Pt although they showed lower values for the absolute conversion of NO due to a decrease in the total number of the Pt active sites. In addition, the bimetallic catalysts significantly improved the sulfur resistance as compared to the monometallic Pd catalyst. Moreover, the bimetallic catalysts could easily recover their activity for NO and C3 H6 oxidation by thermal treatment either in lean conditions or in H2 . The reduction with H2 was necessary to recover completely the activity of the CO and C3 H8 oxidation. Graphical Abstract: ga1 Highlights: Pt-Pd alloy formation leads to contraction of the lattice constants of Pt. Pt-Pd alloy enhances the oxidation/sintering resistance of the metallic phases. Bimetallic Pt-Pd catalysts exhibit superior conversion for CO and C3 H6 . Bimetallic Pt-Pd catalysts induce the reduction of NO by C3 H6 at low temperatures. Pt3Pd1 are more advantageous than monometallic Pt in sulfur poisoning conditions.