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장종산,이진호,Jong-Min Lee,Ji Hye Lee,홍도영,Myong Woon Kim,정성화 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.4
The Pt/C and Pd/C catalysts were prepared from conventional chloride precursors by adsorption or precipitation-deposition methods. Their activities for hydrogenation reactions of cyclohexene and aceto- phenone were compared with those of commercial catalysts. The Pt/C and Pd/C catalysts obtained from the adsorption procedure reveal higher hydrogenation activity than commercial catalysts and the catalysts prepared by the precipitation-deposition method. Their improved performances are attributed to the decreased metal crystallite sizes of Pt or Pd formed on the active carbon support upon the adsorption of the precursors probably due to the same negative charges of the chloride precursor and the carbon support. Under the preparation conditions studied, the reduction of the supported catalysts using borohydrides in liquid phase is superior to a gas phase reduction by using hydrogen in the viewpoint of particle size, hydrogenation activity and convenience.
Low Temperature Adsorption of Hydrogen on Nanoporous Materials
장종산,윤지웅,김혜경,정성화 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.7
Hydrogen adsorption on various porous materials have been studied with a volumetric method at low temperature in the pressure of 0-760 torr. Their hydrogen uptakes depend at least partly on microporosity rather than total porosity. However, it is also necessary to consider other parameters such as pore size and pore architecture to explain the adsorption capacity. The heat of adsorption and adsorption-desorption-readsorption experiments show that the hydrogen adsorption over the porous materials are composed of physisorption with negligible contribution of chemisorption. Among the porous materials studied in this work, SAPO-34 has the highest adsorption capacity of 160 mL/g at 77 K and 1 atm probably due to high micropore surface area, micropore volume and narrow pore diameter.
장종산,Jae Oak Ryu,Jong Min Lee,박상언,홍도영,정성화 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.10
Catalytic properties of Ni-ZrO2 catalysts prepared by coprecipitation have been studied for the gas-phase hydrogenation of 1,3-butadiene to butenes. The coprecipitation method led to the solid solution of Ni-ZrO2, which contains highly resistant Ni species to thermal reduction with H2. Nickel species of the solid solution were highly dispersed in the ZrO2 lattice, so that the reduced catalysts were selective for hydrogenation of 1,3-butadiene to butenes (99.9%) even in the presence of 1-butene.
Photoinduced Superhydrophilicity in TiO2 Thin Films Modified with WO3
장종산,Kashinath Rangu Patil,김혜경,Shivaram Dattatraya Sathaye,황진수,박상언,황영규 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.10
Tungsten oxide-modified TiO2 thin films were formed on a glass substrate by sol-gel and dip coating processes using acetyl acetone as a chelating agent. The hydrophilic properties of the thin films were investigated with illumination of UV light. The dependence of water contact angle on material composition and morphology of the film is established with SEM image and AFM profile. The surface morphology was controlled with the change of precursor concentration. 0.01 M of tungsten oxide-modified TiO2 have shown the highest hydrophilicity after UV-irradiation. The effect of composition on photoinduced hydrophilicity of the WO3-TiO2 films was also investigated. The films were characterized by XRD, SEM, AFM and XPS.
Catalysis and energy-efficient sorption applications by nanocomposite materials
장종산 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Main research in RCN (Research Center for Nanocatalysts) in KRICT has focused on the development of nanocatalysts and nanoporous materials including metal-organic frameworks (MOFs) and zeolites, and energy-related catalysis as well as green and sustainable chemistry including catalysis for biorefinery. This presentation will first cover the introduction to current research on the center including the defunctionalization of biomass-derived chemicals by heterogeneous nanocomposite catalysts. Then, the presentation will focus on the utilization of nanocomposite materials based on porous metal carboxylates as multifunctional adsorbents and catalysts that can be used for energy-efficient sorption applications and catalysis.