Effect of Metal Oxides (CeO<sub>2</sub>, ZnO, TiO<sub>2</sub>, and Al<sub>2</sub>O<sub>3</sub>) as the Support for Silver-Supported Catalysts on the Catalytic Oxidation of Diesel Particulate Matter
Punya Promhuad, Boonlue Sawatmongkhon, Kampanart Theinnoi, Thawatchai Wongchang, Nuwong Chollacoop, Ekarong Sukjit, Sarayut Tunmee, A. Tsolakis
Abstract
High Resolution Image Download MS PowerPoint Slide This work presented the influence of metal oxides as the support for silver-supported catalysts on the catalytic oxidation of diesel particulate matter (DPM). The supports selected to be used in this work were CeO 2 (reducible), ZnO (semiconductor), TiO 2 (reducible and semiconductor), and Al 2 O 3 (acidic). The properties of the synthesized catalysts were investigated using XRD, TEM, H 2 -TPR, and XPS techniques. The DPM oxidation activity was performed using the TGA method. Different states of silver (e.g., Ag° and Ag + ) were formed with different concentrations and affected the performance of the DPM oxidation. Ag 2 O and lattice oxygen, which were mainly generated by Ag/ZnO and Ag/CeO 2, were responsible for combusting the VOCs. The metallic silver (Ag°) formed primarily on Ag/Al 2 O 3 and Ag/TiO 2 was the main component promoting soot combustion. Contact between the catalyst and DPM had a minor effect on VOC oxidation but significantly affected the soot oxidation activity.