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Modified Zeolite Based Catalysts for Efficient Chemical Hydrolysis of PET into Valuable Chemicals
강명종,황성연,제갈종건,차현길 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
As increasing plastic waste contamination on the earth due to intrinsic properties of polyethylene terephthalate (PET), especially remarkable persistency and low or absence of enzymes for catabolizing degradation of PET, recycling PET to valuable chemicals has been studied for decades. Here, we introduce modified Zeolite-based catalysts which enable facilely recoverable and neutral reaction condition for microwave assisted PET hydrolysis into terephthalic acid (TPA). Catalytic properties of modified Zeolite based catalyst was recovered by simple regeneration process.
침입절도 범죄 간 유사도 측정 알고리즘의 개발 및 응용에 관한 연구
강명종 ( Kang Myeong Jong ),강일구 ( Kang Il Gu ),김민정 ( Kim Min Jung ),조성호 ( Cho Seong Ho ),이경은 ( Lee Kyeong Eun ),이미희 ( Lee Mi Hee ) 한국경찰학회 2018 한국경찰학회보 Vol.20 No.6
새로운 범죄 사건이 발생했을 때, 이에 대한 수사는 일반적으로 이전의 유사한 수법의 기존 범죄자에 대한 조사로부터 시작된다. 하지만 여기에서 말하는 “유사성”은 상당히 주관적인 용어로 실제 “가장 유사한 수법”에 대한 판단은 사람에 따라 달라지며, 따라서 수사관의 역량에 따라 이러한 수사의 효율이 심하게 달라질 수 있다. 하지만 기존의 텍스트 간 유사도 측정 방법론은 몇 가지 한계로 인하여 실제 수사 문서 분석에서는 활용되기 어려웠다. 본 연구에서는 인구학적 지표인 상이지수에서 착안한 수사 항목 간의 유사도를 바탕으로 실제 사건 간 유사도를 측정하는 방법론을 제시하였다. 이와 더불어 국내 침입절도 사건에 초점을 맞추어 2011년~2015년 사이 발생한 실제 침입절도 사건의 수사 보고서로부터 대규모 텍스트마이닝 작업에 의해 추출된 데이터에 적용하여 동일범에 의한 사건들이 그렇지 않은 사건들에 비해 더 높은 유사도를 가진다는 결론을 이끌어냄으로써 수법범죄로 분류되는 침입절도 사건의 성격에 부합하는 결과를 얻음으로써 본 연구에서 제시된 유사도 측정 방법론에 대한 실질적인 검증 역시 이루었다. When new crime occurs, the first thing people do is to analyse previous criminals with similar MO. The “similarity” is, however, too subjective to quantify, so it is not easy to define the most similar crime. That means, the efficiency of investigation depends too much on capabilities of investigators. However, previous researches for measuring similarity between crime cases have some limitation which makes it difficulty to be applied to real investigation document analysis. In this paper, we develop a new measure to quantify the similarity between two crimes by measuring similarities items related to investigation, come from the index of dissimilarity in demography. In addition, focused on break-in burglary, we apply this measure to the real data set which is extracted from investigation-related documents for real break-in burglary cases occurred in 2011~2015. We also achieve some proofs that the suggest measure makes sense in real cases as well by deducing the result that crimes occurred by the same offender are more similar than crimes occurred by different offenders, which corresponds to the characteristic of break-in burglary crimes.
김창우,강명종,Thanh Khue Van,강영수 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
Hematite single crystals are one of most promising materials which is able to apply for the field of catalyst industry. Even its prospective applicability, strategies for improving its catalytic performance are still not enough to meet the requirements for industrial application. In the present work, we demonstrate a morphology selective one pot reaction for a hematite single crystal by microwave-assisted hydrothermal synthesis. The microwave-assisted hydrothermal route, taking advance of the exposed crystal facetbased activity of the material, is suggested to crystal facet controlling synthesis of the hematite crystal. The dispersant and capping agents such as sodium carboxymethyl cellulose and N2H4, respectively, play a very important role in controlling the exposed crystal facet and morphological uniformity for a selective morphology of hematite crystal. In addition, systematically experimental examination of the wellexposed facet is interestingly giving an insight into the crystal growth and morphological evolution of single crystalline hematite from plate to tetrahexagonal bipyramid, octahedral and oblique cubic shape. Physicochemical techniques were used to characterize and evaluate the photoactivity of the material in detail. In here, a well-defined crystal facet is obtained and expected to be applied as an efficient catalysts and its synthetic methodology is applicable to other metal oxide photocatalyst.
Chemical Recycling of PET through Hydrolysis by Biomass-derived Acid catalyst
김경안,강명종,황성연,제갈종건,차현길 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Chemical recycling of polyethylene terephthalate (PET) has been tried for decades, but still there are not efficient ways to recycling PET. Here, we introduce the microwave assisted PET hydrolysis for recycling PET into terephthalic acid (TPA) and ethylene glycol (EG) with biomassderived acid catalyst. Chemically modified biomass-derived silica has been introduced firstly in this work for microwave-assisted PET hydrolysis reaction.
유혜진,강명종,제갈종건,황성연,차현길 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Photocatalytic water purification has emerged as new effective ways for an environment preserve and purification in few decades. As a part of studies on photocatalytic water purification, constructing heterojunction structured compounds with different photocatalysts for efficient organic pollutant degradation is regarded as key-strategy. Herein, facile one-step carbonizing process was introduced for synthesizing Fe2O3 with Z-scheme heterojunction photocatalyst. Rhodamine B (RhB) degradation reaction was carried out by synthesized photocatalsyt.
New Avenues to Efficient Production of 2-pyrone-4,6-dicarboxylic acid from Plastic waste
김경안,김희택,강명종,차현길 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
One of valuable monomer for bio-degradable plastic, 2-pyrone-4,6- dicarboxylic acid (PDC), was synthesized using plastic waste by chemomicrobial hybrid process. The efficiency improvement of hydrolysis reaction of plastic waste was investigated by reaction kinetics studies. A new avenues with chemo-microbial system produce 96.08 % of PDC from plastic waste.
Which electrode is better for biomass valorization: Cu(OH)2 or CuO nanowire?
Hoang Minh Pham,강명종,김경안,임창규,황성연,차현길 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.3
2,5-furandicarboxylic acid (FDCA), one of the key building block for replacing petroleum-derived terephthalic acid, is utilized as the source of bioplastics, pharmaceuticals. Herein, free-standing Cu(OH)2 and CuO nanowires as electrode were examined to disclose the effects of crystal structure and chemical formation based on copper oxide in electrocatalytic 5-Hydroxymethylfurfural (HMF) oxidation to FDCA in 0.1M KOH solution. We introduced on threedimensional copper foam (CuF) with high porosity as copper source and substrate with high conductivity free-standing Cu(OH)2 and CuO nanowires (NWs) on the substrate by inorganic polymerization and calcination for electrochemical HMF oxidation. This was enabled by square-planar coordination (x2y2) of Cu2+ ions in (001) crystal faces of Cu(OH)2 crystal. As a result of stacking with hydrogen bonds, free-standing Cu(OH)2 NWs on the substrate was formed. There was no change in the morphology of the nanowire arrays, but the active sites from a plane area per surface- exposed Cu atoms by transformation of Cu(OH)2 to CuO NWs increased.