121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-519
Subject Selective Chlorination of CH4 to CH3Cl with Molecular Cl2 Gas on the Surface of Solid Acid Catalysts: Effect of Acidity and Pt Metal Nanoparticles
Authors Seungdon Kwon, Daeho Kim, Kyungsu Na*
Department of Chemistry, Chonnam National University, Korea
Abstract Many processes for converting methane to value-added chemical has been studied. One representative example is CH4 chlorination that is radical-mediated thermal reaction. Under sufficient supplement of thermal energy, Cl2 molecules can be dissociated to two chlorine radicals, which triggered the C-H bond activation of CH4 molecule and thereby various chlorinated methane products (i.e., CH3Cl, CH2Cl2, CHCl3, CCl4) could be produced. Chlorinated methane products are used as a reaction intermediate to produce olefin. Because formation of chlorinated methane products excluding methyl chloride accelerates deactivation of catalyst and dichloromethane promotes the formation of aromatic compounds, one of the most important key to making hydrocarbon is selectivity of methyl chloride. However, it is difficult because increase of CH4 conversion is always accompanied by a decrease in the CH3Cl selectivity (trade-off). In this works, various zeolite-based catalysts are designed and prepared to break the trade-off phenomenon. Some properties such as Si/Al ratio, novel metal loading, micropore aperture size control, and frustrated lewis pair (FLP) were investigated comprehensively. Prepared catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and solid state magic angle spinning (MAS) Al nuclear magnetic resonance (NMR). The reaction was performed in a fixed-bed reactor under a continuous gas flow condition. Reactants and products were analyzed by using gas chromatography (GC). Several variables were researched, and only FLP in PtxPdy-loaded NaY broke trade-off phenomenon. The details of CH4 chlorination and the results are going to be addressed in this poster.
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