• Spatial Information Research
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• v.20 no.5
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• pp.1-13
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• 2012

This study intends to evaluate the seasonal flow direction of carbon dioxide in Northeast Asia by using GOSAT, the first Greenhouse Observing SATellite, in an attempt to overcome costly, laborious and time consuming ground observation which has been frequently pointed out in existing studies. For this purpose, missing values were supplemented by applying the Kriging interpolation and the overall flow direction of carbon dioxide was determined through anisotoropy semi-variogram. As a result, it was found that the overall spatial distribution of carbon dioxide in Northeast Asia varies depending on the latitude, and that carbon dioxide mainly flows southeast or east in spring, autumn and winter, but northeast or north in summer. Similar to the flow of monsoons in Northeast Asia, these results show that carbon dioxide flows mainly from the west to the east, which proves that carbon dioxide discharged from China is influencing even the Korean Peninsula and Japan. However, as the flow of carbon dioxide varies depending on a variety of factors such as artificial sources, plant respiration, and the absorption and discharge of the ocean, follow-up studies are requested to evaluate such variables and the correlations.

• Journal of the Microelectronics and Packaging Society
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• v.30 no.4
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• pp.17-31
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• 2023

Amidst escalating global warming fueled by indiscriminate fossil fuel consumption, concerted efforts are underway worldwide to mitigate atmospheric carbon dioxide (CO₂) levels. Electrochemical CO₂ reduction technology is recognized as a promising and environmentally friendly approach to convert CO₂ into valuable hydrocarbon compounds, deemed essential for achieving carbon neutrality. Copper, among the various materials used as CO₂ reduction electrodes, is known as the sole metal capable of generating C₂₊ compounds. However, low conversion efficiency and selectivity have hindered its widespread commercialization. This review highlights diverse research endeavors to address these challenges. It explores various studies focused on utilizing copper-based electrodes for CO₂ reduction, offering insights into potential solutions for advancing this crucial technology.

• Korean Chemical Engineering Research
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• v.47 no.3
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• pp.267-274
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• 2009

Considerable attention has been given to developing methodologies to reduce the emission of carbon dioxide from industry to meet strengthened environmental regulations. In this article, recent research trends on dry reforming of methane as an alternative method to reduce $CO_2$ emission from large scale industrial processes are addressed. To efficiently provide the energy needed in this strong endothermic reaction without additional $CO_2$ emission, it seems to be desirable to adopt autothermal reaction mode. The produced synthesis gas could be used as a reducing gas, or a feedstock for synthesis of chemicals and fuels.

• Journal of the Korea Organic Resources Recycling Association
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• v.30 no.4
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• pp.141-150
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• 2022

To abate the environmental burden derived from the massive generation of cattle manure (CM), pyrolysis of CM was suggested as one of the methods for manure treatment. In respect of carbon utilization, pyrolysis has an advantage in that it can produce usable carbon-based chemicals. This study was conducted to investigate a syngas production from pyrolysis of CM in CO₂ condition. In addition, mechanistic functionality of CO₂ in CM pyrolysis was investigated. It was found that the formation of CO was enhanced at ≥ 600 ℃ in CO2 environment, which was attribute to the homogeneous reactions between CO₂ and volatile matters (VMs). To expedite reaction kinetics for syngas production during CM pyrolysis, Catalytic pyrolysis was carried out using Co/SiO2 as a catalyst. The synergistic effects of CO₂ and catalyst accelerate the formation of H₂ and CO at entire temperature range. Thus, this result offers that CO₂ could be a viable option for syngas production with the mitigation of greenhouse gas.

• Convergence Security Journal
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• v.14 no.4
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• pp.101-108
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• 2014

Recently, The cloud computing technology is emerging as an important issue in the world and the cloud computing has attracted much attention to the technology about carbon dioxide reduction. However, Unlike to the positive aspects of a cloud computing are included several security vulnerabilities. For this reason, the carbon dioxide reduction of a cloud computing technology has a differences. Therefore, this paper will be analyzed to the carbon dioxide emission factors of a cloud computing through the cloud case studies related $CO_2$ emissions and experiments measured of $CO_2$ emissions a security system. and In the future, this is expected to be utilized as a basis for the security design and performance improvement.

• Proceeding of EDISON Challenge
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• 2013.04a
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• pp.67-75
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• 2013

최근 이상기후의 원인으로 손꼽히는 물질의 중심에는 이산화탄소가 있으며 이를 제거하기 위한 여러 연구가 진행되고 있다. 최근에는 전극이 있는 수조에 미생물을 넣고 이산화탄소를 화학적 에너지로 사용할 수 있도록 알코올로 변환시켜주는 시스템이 발표되었다. 이에 따라 본 연구진에서는 이러한 전극 시스템에서 이용될 수 있는 효소를 찾고 효소촉매화 반응의 메커니즘을 자세히 연구하고자 하였다. 본 연구에서 사용된 효소인 Formate dehydrogenase (FDH)는 formate를 조효소인 nicotinamide adenine dinucleotide ($NAD^+$)를 사용하여 이산화탄소로 산화시키는 반응을 촉진시키는 효소이다. 본 연구에서는 이러한 FDH의 산화반응의 역반응을 이용하여 이산화탄소를 효과적으로 분해하는 메커니즘을 연구하기에 앞서 wild type의 반응 메커니즘에 대해 깊이 연구하고자 B3LYP 방법의 양자계산을 하여 반응의 transition state와 potential energy를 조사하였다.

• Cement Symposium
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• s.49
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• pp.21-22
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• 2022

The purpose of this study is to reduce carbon dioxide emissions in the cement industry and to collect carbon dioxide generated in industrial facilities such as cement factories and thermal power plants, store and utilize it, and convert high-value-added resources. While conventional Ordinary Portland Cement is characterized by hardening through hydration reactions, basic research is underway to develop cement that reacts with carbon dioxide and converts it into carbonate mineralization.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.72.1-72.1
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• 2013

광촉매 활용 기술은 수질 및 대기 중의 난분해성 오염 물질 처리 등의 환경 분야에서부터 항균 및 초친수성 기능을 활용한 소재 분야, 그리고 태양광을 이용한 물분해 수소 제조 및 이산화탄소의 전환 등의 인공 광합성 연구 분야까지 그 응용분야가 대단히 넓은 기술이다. 본 강연에서는 이러한 광촉매의 반응 원리와 대표적인 응용분야인 환경 정화 분야 및 에너지 분야에서의 광촉매 기술의 활용, 그리고 현재 광촉매 관련 연구 분야의 주요 관심사 및 미래 성장을 위한 과제 등을 포괄적으로 다루고자 한다. 광촉매 반응은 반도체의 따간격 에너지 흡수에 따라 전자와 정공(+전하를 가진 전자와 같은 거동을 하는 입자)가 발생한 뒤에 일어나는 계면에서의 전자전달 반응을 기초한다. 발생한 정공과 전자는 각각 산화와 환원 반응을 유발하며 이러한 산화, 환원반응을 통해 다양한 분야로의 응용이 가능하다. 환경 정화 분야의 경우, 정공이 물 혹은 공기 속에 존재하는 수분과 반응하여 생성되는 OH 라디칼 ($OH{\cdot}$)의 강력한 산화력을 주로 이용하게 된다. OH 라디칼에 의한 다양한 난분해성 유기물질의 산화분해 반응을 활용하여 고도처리공정이 가능하게 되며, 수계 난분해성 유기오염물질의 제거뿐만 아니라 대기 중에 존재하는 VOCs, 악취물질 등의 분해도 가능하며, 아울러 바이러스나 박테리아와 같은 세균을 제거할 수 있는 것으로 알려져 있다. 한편, 물 분해 수소제조 및 이산화탄소의 전환과 같은 에너지 분야 응용의 경우, 전도대의 전자를 활용한 환원반응에 기초한다. 앞서 언급한 다양한 응용분야에서 활용될 수 있는 광촉매의 종류 또한 매우 다양하며, 이사화티탄(TiO2)는 대표적인 고효율 상용 광촉매이다. 아울러, 원하는 응용 분야에서의 광활성이 높은 새로운 광촉매의 제조 및 평가가 꾸준히 진행되고 있으며, 그 가운데 태양광의 가장 많은 영역을 차지하고 있는 가시광 활성을 갖는 광촉매 개발에 관한 연구가 활발히 수행되고 있다. 이에, 현재까지 개발된 다양한 가시광 광촉매 시스템에 대한 소개 및 각 광촉매 응용분야에서 최근 새롭게 대두되고 있는 이슈들에 대하여 중점적으로 고찰하고자 한다.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.9
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• pp.933-938
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• 2008

In the present study, carbon dioxide was converted to methane, using bio-hydrogen. Here, the bio-hydrogen was produced from organic waste. The anaerobic microorganism was cultured using only carbon dioxide and hydrogen for duration of 3 months. Therefore methane was not produced with acetogenotrophs. During methane production, carbon dioxide and hydrogen are taken in different ratios; among which 1 : 5 ratio has shown the highest methane yield. Carbon dioxide and hydrogen were introduced into the reactor at the rate of 8 mL/min and 40 mL/min, respectively. In this case, 92% of carbon dioxide was reduced and 2.2 m$^3$/m$^3$ day amount of methane was produced. Thus, the process has been successful in conversion of carbon dioxide into methane by purging it into methane fermentation reactor with bio-hydrogen using batch process.

• Plant Journal
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• v.9 no.2
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• pp.42-45
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• 2013

The worldwide issue of greenhouse gas reduction has recently drawn great attention to carbon capture and storage(CCS). In this study, we developed a 10,000 ton/year pilot injection plant for geological storage of carbon dioxide. Major components of the pilot plant include a pressure pump, a booster pump, and an inline heater to bring liquid carbon dioxide into its supercritical state. The test results show that the pilot plant readily achieves the injection pressure and temperature, showing satisfactory control performance. The overall power consumption is 2,000 ~ 2,500 W, more than 75% of which consumed by the pressure pump. This study will facilitate varied research on greenhouse gas reduction as the only domestically developed system for geological injection.