120th General Meeting of the KCS

Type Poster Presentation
Area Environmental Energy
Room No. Exhibition Hall 2+3
Time 10월 19일 (목요일) 11:00~12:30
Code ENVR.P-507
Subject Ce-Substituted LaFeO3 Perovskite-Type Oxides with Enhanced Catalytic Performance and Sulfur Resistance for NH3-SCR
Authors Dae-Yeon Won, Seung-Yeop Kwak*
Department of Materials Science and Engineering, Seoul National University, Korea
Abstract We synthesized Ce-substituted LaFeO3 perovskite-type oxides (LCFO) via Pluronic F127-assisted hydrothermal process. Obtained LCFOs exhibited several micrometer-sized spherical morphology. Crystal structure of LCFO was pure LaFeO3 perovskite structure with small amount of cerium because lanthanum ions were perfectly substituted by cerium ions. Increasing the ratio of Ce to La ions, however, it was found that cerium oxides were formed by unsubstituted Ce ions. The catalytic properties of LCFOs were evaluated by the efficiency of selective catalytic reduction of nitric oxide with ammonia (NH3-SCR). Pure LaFeO3 oxide (LFO) showed poor catalytic performance for NH3-SCR, which is consistent with previous studies. On the other hand, NO conversion efficiencies were significantly enhanced in LCFO samples, especially in pure phased LCFO. Furthermore, the LCFO catalyst with single crystal structure exhibited high resistance against SO2 gas. This results indicated the substituted Ce ions generated new type of active sites with enhanced catalytic activity and SO2 tolerance.
E-mail dywon0725@snu.ac.kr