125th General Meeting of the KCS

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Type Oral Presentation
Area Oral Presentation for Young Material Chemists
Room No. Room 303 (Live Streaming)
Time TUE 10:15-10:30
Code MAT.O-6
Subject Mesoporous zeolite as a promising support for metal catalysts
Authors Jaeheon Kim, Ryong Ryoo*
Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Korea
Abstract Zeolites are microporous crystalline aluminosilicates, which are widely used as an acid catalyst in petrochemical processes due to their strong acidity and molecular-shape selectivity. In addition, zeolites can support metal catalysts as a form of nanoparticles stabilized inside the micropores. These zeolite applications were mainly focused on the use of micropores. Recently, the application range of zeolite has been widened from micropores to mesopores since the development of mesoporous zeolites. In this presentation, we demonstrate a great merit of mesoporous zeolite as a support for metal catalysts. The mesoporous zeolite was obtained according to a synthesis strategy using a multiammonium surfactant as a dual micro/mesopore-generating agent, thereby exhibiting 3-D interconnected mesopores possessing uniform diameters about 4 nm built with ultrathin microporous frameworks. Notably, light 3d transition metals (e.g., Ni and Co), which could easily undergo sintering into large agglomerates due to low polarizability, were able to be stabilized inside the mesopores in a form of nanoparticles or nanowires due to the confinement effect. The Ni- and Co- supported mesoporous zeolite catalysts exhibited high catalytic performance in hydroisomerization of n-dodecane and FT-synthesis reactions, respectively. It was particularly noteworthy that in n-dodecane hydroisomerization, the catalytic performance of Ni/mesoporous zeolite was comparable to that of the Pt/mesoporous zeolite and much higher than that of Pt/conventional bulk zeolite. Furthermore, the mesoporous zeolite was beneficial to support bimetallic alloy catalysts that can exhibit exceptionally high catalytic performance for industrially important catalytic reaction.
E-mail japuny@kaist.ac.kr