121st General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Material Chemists
Room No. Samda Hall A
Time THU 10:17-:
Code MAT.O-8
Subject Ammonium functionalization of porous supports to increase metal dispersion in high loading metal catalysts
Authors Jangkeun Cho, Ryong Ryoo*
Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Korea
Abstract High loading of metal catalyst on a porous support is desirable to achieve high catalytic performance in heterogeneous catalysis. However, at a high loading of metal, the dispersion becomes very poor due to agglomeration of metal particles. In this work, we present a strategy to solve the problem in case of high loading non-noble metal catalysts. Our approach utilized a regioselective nucleation of inorganic salts on the mesopore walls via surface functionalization with basic ammonium groups. The functional groups increased the internal basicity within the porous environment, which caused local precipitation of metal precursors as hydroxide forms preferentially inside the pores. After calcination and/or reduction process, we could obtain highly dispersed Ni, Cu, and SnO2 nanoparticles supported on porous materials such as MFI zeolite nanosponge, MCM-48 mesoporous silica, and porous alumina with loading amount up to 30 wt%. The obtained Ni catalyst exhibited a superior catalytic activity for CO2 methanation reaction compared to the cases using unfunctionalized catalyst supports. In addition, supported Cu based catalyst showed higher catalytic activity than Pt based catalyst in preferential oxidation of CO. Such a high catalytic activity should be attributed to the large number of active sites resulting from the high dispersion of supported Cu. We believe that this novel approach is applicable to other basic functional groups, support materials, and supported species. Furthermore, the present method allows the rational synthesis of multi- component catalysts with a high interfacial area.
E-mail chojangkuen@kaist.ac.kr