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Effect of Diamine in Amine-Functionalized MIL-101 for Knoevenagel Condensation
Kasinathan, Palraj,Seo, You-Kyong,Shim, Kyu-Eun,Hwang, Young-Kyu,Lee, U-Hwang,Hwang, Dong-Won,Hong, Do-Young,Halligudi, Shiva B.,Chang, Jong-San Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.6
Myung-Geun Jeong,Young Dok Kim,Sunyoung Park,Palraj Kasinathan,황영규,Jong-San Chang,Yong-Ki Park 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.10
We prepared a ZnO/mesoporous Al2O3-shell/core structure by using atomic layer deposition (ALD) of ZnO on commercially-available mesoporous Al2O3. We used various analysis techniques such as scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, inductively coupled plasma-atomic emission spectroscopy, and surface area and pore size analyses based on nitrogen isotherm data. A 200 nm-thick slab of mesoporous Al2O3 particles was decorated by ZnO upon ALD deposition, whereas the inner part of the Al2O3 particle was free of ZnO. We evaluated the catalytic activity of the bare and the ZnO-covered Al2O3 for plasma-assisted nonoxidative coupling of methane. The catalytic behavior was shown to be sensitive to the amount of ZnO deposited. Particularly, 40-cycled ZnO/Al2O3 showed an enhanced selectivity to the olefin product with almost the same CH4 conversion as that of bare Al2O3. Preparation of the shell/core structure by using ALD can be an interesting strategy for finding highly-efficient catalysts in a plasma-assisted catalytic reaction.
Jeong, Myung-Geun,Kim, Young Dok,Park, Sunyoung,Kasinathan, Palraj,Hwang, Young Kyu,Chang, Jong-San,Park, Yong-Ki 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.
<P>We prepared a ZnO/mesoporous Al2O3-shell/core structure by using atomic layer deposition (ALD) of ZnO on commercially-available mesoporous Al2O3. We used various analysis techniques such as scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, inductively coupled plasma-atomic emission spectroscopy, and surface area and pore size analyses based on nitrogen isotherm data. A 200 nm-thick slab of mesoporous Al2O3 particles was decorated by ZnO upon ALD deposition, whereas the inner part of the Al2O3 particle was free of ZnO. We evaluated the catalytic activity of the bare and the ZnO-covered Al2O3 for plasma-assisted nonoxidative coupling of methane. The catalytic behavior was shown to be sensitive to the amount of ZnO deposited. Particularly, 40-cycled ZnO/Al2O3 showed an enhanced selectivity to the olefin product with almost the same CH4 conversion as that of bare Al2O3. Preparation of the shell/core structure by using ALD can be an interesting strategy for finding highly-efficient catalysts in a plasma-assisted catalytic reaction.</P>
Hee Chul Woo,Doohwan Lee,Hoang Phuoc Ho,Palraj Kasinathan,Jaesung Kim 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.6
Deep desulfurization properties and characteristics of activated carbon (AC) modified by impregnation of CuCl2 were studied using simulated hydrocarbon fuels containing dimethyl sulfide (DMS), tert-butylmercaptan (TBM), and tetrahydrothiophene (THT), the typical organosulfur compounds representing sulfides, thiols, and thiophenes that exist in fuel gases. The pristine AC had limited adsorptive desulfurization performance for a ternary DMS-THT-TBM mixture feed with an early breakthrough of DMS and TBM due to its preferential adsorption of THT. The adsorption of these organosulfur species on the AC surface was intrinsically weak and competing, as indicated by their low desorption activation energies (37-39 kJ mol−1). However, relatively stronger adsorption of THT than the others led to the AC surface gradually being covered by THT through replacement of the initially adsorbed TBM and DMS. The impregnation of CuCl2 on the AC (3.4 atomic % Cu) additionally formed strong and selective adsorption sites for TBM (activation energy=58.6 kJ mol−1) on the AC surface, which gave rise to about three-fold increase in the total breakthrough adsorption capacity for these sulfur species. The structure and physicochemical properties of the adsorbents were characterized by N2 adsorption, x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, differential scanning calorimetry, and surface pH measurement. The results suggested that the modulation of adsorption selectivity of the AC surface by CuCl2 impregnation had significant effects on the overall deep desulfurization performance for fuel gases containing multiple organosulfur species in practical conditions.