Jae Ho Baek

Synthesis of Palladium Nanoparticles in Various Carbon Materials

The outstanding properties of Pd-base catalysts make is attractive for applications in various field, such as hydrogen storage, catalysis, fuel cell, chemical sensing and so forth. Therefore, research studies have been carried out on its preparation and characterization. Commonly, the Pd must be deposited on support materials with a large surface area to provide high metal dispersion and a high electrical conductivity to facilitate electron transfer, which carbon materials. The purpose of this study is to investigate not only synthesis of various carbon materials(graphene, carbon nanotube(CNT), active carbon, carbon black) supported Pd but also the confirmation of the properties. The characterization of Pd catalysts composites was performed by X-ray diffra ction(XRD), Brunauer-Emmett-Teller(BET), scanning electron microscopy (SEM) and transmission electron microscopy(TEM). According to TEM image, Pd nanoparticles were highly dispersed on surface of graphene

Effect of Carbon Pre-Treatment on Pd Dispersion in Synthesis of Pd/C Catalyst

In this study, we confirmed effect of carbon pre-treatment on Pd dispersion in synthesis of Pd/C catalyst. Physical characteristics on the surface of before and after pre-treated carbon were analyzed by nitrogen adsorption-desorption analysis. The dispersion and size of Pd particles were analyzed by XRD, FE-TEM and CO-chemisorption. After pre-treatment, surface area of carbon were decreased. And mesopore area ratio were increased with decreasing micropore area ratio. In the case of pre-treated carbon, we confirmed high dispersion of Pd particles.

The Effects of Deposited Material and Loaded Amount within Synthesis of TMP-Ester

Due to changing of wind power from on-shore to off-shore, it is necessary to eco-friendly features but also insulating characteristics. The purpose of this study is to confirm that effect of deposited material and amount of catalyst for synthesis of TMP(tri-methylol propane)-ester as vegetable insulating oil. Potassium fluoride and potassium bromide were deposited via an impregnation method on HAP(hydroxyapatite). The effects of deposited material loading on the characteristics of the catalysts were investigated through XRD, XRF, FE-SEM, BET and TPD. We confirmed that KF/HAP catalyst has higher activity than KBr/HAP. The higher activity of KF(40%)/HAP catalyst showed the best catalytic properties.

Synthesis of Glycerol Carbonate from Biomass Glycerol: Focus on the Calcination Temperature

We carried out a reaction in which glycerol carbonate was synthesized by using glycerol and urea. The physical properties of the prepared catalysts were investigated by BET surface area, X-ray diffraction, temperature programmed desorption, and Field-emission scanning electron microcopy. In addition, we confirmed the conversion of the glycerol and the yield of the glycerol carbonate according to calcination temperature. From XRD results, the crystalline of prepared ZnAl2O4 was slowly increased with an increasing of the calcination temperature. When the calcination temperature of ZnAl2O4 was 500 , the conversion of the glycerol was 74.4% and the yield of the glycerol carbonate was 73.3%. The conversion of the glycerol and the yield of the glycerol carbonate can be obtained higher when acid/base ratio is approx. 1. From this result, we may conclude that the acid & base site density and ratio of catalysts were very important parameters in the synthesis of glycerol carbonate from urea and glycerol.

The Effects of binary metal oxide catalysts for the synthesis of glycerol carbonate

Abstract The glycerol carbonate was synthesized by glycerol and urea using metal oxide catalysts. The physical properties of the prepared metal oxide catalysts were investigated by X-ray diffraction (XRD), specific surface area analysis (BET), field emission scanning electron microscopy (FE-SEM) and temperature programmed desorption (TPD). In addition, we confirmed the conversion of the glycerol and the yield of the glycerol carbonate according to characteristics of metal oxide catalysts. From XRD and FE-SEM analysis, the crystallite size and crystallinity of metal oxide catalysts decrease with addition of Al. In addition, the Zn-Al mixed metal oxide had higher catalytic activity than the pure ZnO due to decreased side reaction in the synthesis of glycerol carbonate. Key Words : Glycerol, Glycerol carbonate, Catalyst, Zinc oxide, Mixed metal oxide 본 논문은 지식경제부와 한국산업단지공단의 생태산업단지구축사업 (과제번호: 10FF10023)과 지식경제부의 광역경제권 연계협력사업(과제번호: R0000495)의 일환으로 수행되었으며, 이에 감사드립니다. * 교신저자 : 이만식(lms5440@kitech.re.kr)접수일 11년 09월 27일 수정일 (1차 11년 11월 30일, 2차 11년 12월 12일) 게재확정일 12년 01월 05일