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마이크로파 주사에 의해 촉진되는 Pd-MCM-41 촉매를 이용한 무용매 스즈키 반응
채금희 ( Keum Hee Chae ),장소라 ( So Ra Jang ),장원길 ( Won Ghil Chang ),안병준 ( Byoung Joon Ahn ) 전북대학교 과학교육연구소 2010 科學敎育論叢 Vol.35 No.-
The carbon-carbon bond formation reaction, such as Suzuki reaction, is a useful tool for the synthesis of biaryl and diaryl-substituted acetylenes. The reaction products are important building blocks for the synthesis of biologically active molecules and synthetic drugs. The development of active catalysts and the efficient reaction conditions for Suzuki reaction have been investigated in the view of environmentally benign green chemistry. Pd-modified MCM-41 was prepared by impregnation using an aquous solution of [Pd(NH3)4]Cl2 and characterized by using XRD, SEM, TEM, EPMA and BET Sorption Analyzer. The microwave-assisted Suzuki reactions are performed under solvent-free condition. Particularly Pd-MCM-41 was found to be best catalysts for these cross-coupling reactions due to the uniform Pd dispersion, unique channel structure and hydrophilic surface property. K2CO3 base was found to be the most efficient base in the microwave-assisted Suzuki cross coupling reaction of phenylboronic acid with iodobenzene. Microwave-assisted coupling reaction under the solvent-free condition was accelerated in a shorter time than it was in the thermal reaction and showed good to excellent yield. The major goal of green chemistry is to maximize the use of starting materials, to increase process selectivity, and to replace hazardous and stoichiometric reagents with eco-friendly catalysts in order to facilitate easy separation of the product. The use of Pd-MCM-41 as catalyst in Suzuki reactions was found to be very suitable to the aim of green chemistry.
김영규 ( Young-kyu Kim ),양승빈 ( Seung-bin Yang ),장원길 ( Won-ghil Chang ),이명규 ( Myung-kue Lee ) 한국환경기술학회 2015 한국환경기술학회지 Vol.16 No.1
수생생태계의 활성화와 수질 개선에 효과가 있는 유용미생물과 그 발효물의 공급 효과를 증대시키기 위해 새로운 유용미생물 증폭장치를 설계 및 제안하게 되었다. 본 실험에서는 제안된 장치의 오염물질 처리능력을 검증하였고, 현장 수계에서의 운전 조건을 마련하였다. Monod식을 이용한 본 장치의 COD 최대 제거량은 500 g/㎥·d 정도로 나타났으며 질소 형태에서는 총 질소가 160 g/㎥·d로 가장 크게 나타났으며 다음으로 질산성 질소 140 g/㎥·d, 암모니아성 질소 g/㎥·d의 순으로 나타났다. 이는 본 장치가 운전되는 과정에서의 질소분의 제거 순환 기작은 탈질과 유기질소분으로의 전환 특성을 보였다. 장치 내에서 인은 슬러지의 증체와 분해에 따라서 생물 고정과 용출이 반복되는 것으로 나타났으며 최대 제거 능력에 있어서는 인산염인과 총인이 각각 10 g/㎥d, 6 g/㎥d으로 추정하였다. 인성분의 제거에 있어서는 장치에서보다는 배출 수계의 활성화를 통한 인의 고정 능력이 월등하게 향상되는 것으로 나타났다. A novel water purification equipment was designed and proposed, in order to develop the effective microbes and its fermented materials that was well known effective to the activation of water ecology and improving of water quality. Several experiments were carried out to determine the water pollutants removal capacity of this device, and found out some relationships between the role of this device and the activity of water system. As shown on Monod equation, the maximum COD removal load was measured about 500 g/㎥·d on this equipment. The nitrogen compounds had different removal capacities, which was measured 160 g/㎥·d to total nitrogen, 140 g/㎥·d to nitrate and 80 g/㎥·d to ammonium nitrogen, respectively. The mechanisms of nitrogen remove and recycle system were shown almost to be denitrification and fixation as organic nitrogen. During the monitoring period of the novel device running time, the phosphate removal efficiencies were recorded one from plus to minus, according to sludge growth and degradation in device. And the phosphate and total phosphorus removal capacities were estimated as about 10 g/㎥·d, g/㎥·d, respectively. Even though the phosphate remove was accomplished by fixation into organic cell, the phosphate fixation capacity by effluent in natural water system was superior to the sludge growth in this device.
ZSM-5 제올라이트의 Quartz 로의 전환에 관한 연구
안병준,이정훈,장원길,박영덕 한국공업화학회 1998 응용화학 Vol.2 No.2
Most ZSM-5 zeolite has been synthesized with organic templates. But the study of the crystallization of ZSM-5 zeolite in the absence of organic templates is being pursued recently because of its poisonous property, high cost and environmental problem etc.. ZSM-5 zeolite which is synthesized without organic templates will be transferred to other phase because it has lower structural stability as compared with the ZSM-5 zeolite synthesized with organic templates. The purpose of this study is interpreting the ZSM-5 zeolite-to-Quartz trasformation process using some instrumental techniques including XRD, FT-IR, FT-Raman, EDX and SEM.
알칼리 금속 이온으로 교환된 AIKIT - 1 분자체의 유기 반응에서의 촉매효과에 관한 연구
안병준,신지혜,장원길 한국공업화학회 2000 응용화학 Vol.4 No.2
Recently environmental-friendly and recyclable solid catalysts for the production of fine chemicals are eagerly required. The catalytic activity of alkali metal-exchanged Al-containing KIT-1(Na-AlKIT-1, K-AlKIT-1, and Rb-AlKIT-1) as a base catalyst for organic reaction, especially Knoevenagal reaction was studied. The heterogeneous catalytic Knoevenagal reaction using the alkali-containing AlKIT-1 as the catalyst such as AlKIT-1, Na-AlKIT-1, K-AlKIT-1, and Rb-AlKIT-1, is performed with the solvent or without solvent. The solvent-free system gives promising results. Among them, Rb-AlKIT-1 seems the best catalyst for this reaction.