• Title/Summary/Keyword: CO2 reduction

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Research on Innovation Technologies for Zero Carbon: Carbon Dioxide Reduction in Construction and Concrete Industries (탄소 제로화를 위한 혁신 기술 연구: 건설 및 콘크리트 산업에서의 이산화탄소 저감 방안 동향)

  • Kim, Joo-Hyun;Park, Jung-Jun;Kim, Jong-Kyu
    • Journal of the Korean Society of Industry Convergence
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    • v.25 no.4_2
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    • pp.549-563
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    • 2022
  • Continuous global warming is causing ecosystem destruction and direct damage to human life. The main cause of global warming is greenhouse gases, which account for more than 90 % of carbon dioxide. The leaders of each country signed the Paris Agreement at the United Nations Convention on Climate Change (UNFCCC) to reduce greenhouse gas emissions. Currently, the total amount of CO2 emitted from South Korea is 664.7 million tons as of 2018, ranking eighth in the world. 37 % of South Korea's total CO2 emissions come from the construction & building field, especially the cement production, which is a construction material. Carbon reduction technologies can be largely divided into four types: carbon reduction (CC), carbon reduction and storage technology (CCS), carbon reduction and utilization technology (CCU), and carbon reduction, storage and utilization technology (CCUS). Overseas, CCUS technology is mainly applied to reduce and store CO2 emitted from construction and construction field. A technology for permanently storing CO2 through mineralization by capturing CO2 and utilizing CO2 into a cement production process was developed, and this technology is applied to the entire cement industry. However, the development of CCUS technology applicable to the cement industry is still insignificant in South Korea. In this study, carbon dioxide reduction technology and methods for reducing carbon dioxide emitted during the cement manufacturing process, which is the main component of concrete mainly used in civil engineering construction, were investigated. Overseas, it has reached the commercialization stage beyond the demonstration stage as a way to reduce carbon dioxide by vomiting carbonation reactions. Accordingly, if carbon dioxide reduction plan technology generated during cement manufacturing is developed based on domestic technology differentiated from foreign technology, it is expected to contribute one more step to the carbon neutrality policy.

Electrochemical and Spectroelectrochemical Studies of Cobalt Salen and Salophen as Oxygen Reduction Catalysts

  • Bertha Ortiz;Park, Su Mun
    • Bulletin of the Korean Chemical Society
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    • v.21 no.4
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    • pp.405-411
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    • 2000
  • Electrochemical and spectroelectrochemical studies of cobalt-Schiff (Co-SB) base complexes, Co(salen) [N-N'-bis(salicylaldehyde)-ethylenediimino cobalt(II)] and Co(salophen) [N-N'-bis(salicylaldehyde)-1,2-pheny-lenediimino cobalt(II)], have been c arried out to test them as oxygen reduction catalysts. Both compounds were found to form an adduct with oxygen and exhibit catalytic activities for oxygen reduction. Comparison of spec-tra obtained from electrooxidized complexes with those from Co-SB complexes equilibrated with oxygen in-dicates that the latter are consistent with the postulated complex formed with oxygen occupying the coaxial ligand position, namely, Co(III)-SB·O2 - .The catalysis of oxygen reduction is thus achieved by reducing Co(III) in the oxygen-Co-SB adduct, releasing the oxygen reduction product, e.g., O2 - ., from the Co(II)-SB complex.

Estimation of CO2 Reduction by Applying Idling Stop to in-Use Vehicles (운행자동차의 공회전 정지에 의한 CO2 저감량 산출 연구)

  • Shim, Moo-Kyung;Rim, Jay-Myoung;Lee, Beom-Ho;Hong, Sung-Tae;Lee, Dae-Yup
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.33 no.10
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    • pp.748-756
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    • 2009
  • The effect of idling stop on $CO_2$ reduction was estimated, especially in the area of in-use vehicles. In order to know the fuel saving for each class of vehicles, a methodology to calculate the fuel saving was used along with a standard test using NIER-07 mode. Idling stop execution rate was estimated by analyzing the driving pattern of the in-use city buses, which shows about 75% at maximum. And this corresponds to about 5.4% reduction of the daily total fuel consumption. Finally, $CO_2$ reduction in the automotive sector was estimated, which concludes that, when idling stop device is used, about 480 thousand and 450 thousand tons of $CO_2$ could be reduced with in-use city buses and taxis, respectively. This amount corresponds to about 1.2% of $CO_2$ reduction in the automotive sector.

Preparation of the Nano Cobalt Powder by Wet Chemical Reduction Method (액상환원공정을 이용한 나노 코발트 분말의 합성)

  • Hong, Hyun-Seon;Ko, Young-Dae;Kang, Lee-Seung;Kim, Geon-Hong;Jung, Hang-Chul
    • Journal of Powder Materials
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    • v.18 no.3
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    • pp.244-249
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    • 2011
  • Spherical nanosized cobalt powder with an average size of 150-400 nm was successfully prepared at room temperature from cobalt sulfate heptahydrate ($CoSO_4{\cdot}7H_2O$). Wet chemical reduction method was adopted to synthesize nano cobalt powder and hypophosphorous acid ($H_3PO_2$) was used as reduction agent. Both the HCP and the FCC Co phase were developed while $CoSO_4{\cdot}7H_2O$ concentration ranged from 0.7 M to 1.1 M. Secondary phase such as $Co(OH)_2$ and $CO_3O_4$ were also observed. Peaks for the crystalline Co phase having HCP and FCC structure crystallized as increasing the concentration of $H_3PO_2$, indicating that the amount of reduction agent was enough to reduce $Co(OH)_2$. Consequently, a homogeneous Co phase could be developed without second phase when the $H_3PO_2/CoSO_4{\cdot}7H_2O$ ratio exceeded 7.

Calculating the Optimal Capacity of Energy Storage System to Reduce CO2 Emission for Power System in Je-Ju (제주지역 전력계통에 설치되는 에너지 저장장치의 용량별 CO2 절감량 및 최적용량 산정)

  • Lee, Jong-Hyun;Seol, So-Yeong;Ko, Won-Suk;Choi, Jung-In;Bae, Si-Hwa;Hong, Jun-Hee
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.7
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    • pp.1232-1236
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    • 2010
  • In this Paper, optimal capacity of energy storage and amount of $CO_2$ reduction in Jeju is calculated. Based on electricity demand data of Je-Ju from 2006 to 2007, the estimation electricity demand from 2009 to 2018 is performed. To calculate the amount of maximum $CO_2$ reduction and energy storage capacity in Jeju, the 4th power supply planning and IPCC guideline are used. Finally, Optimal capacity of energy storage and the amount of $CO_2$ reduction are showed.

An Experimental Study on the Evaluation of Thermal Performance of Floor mortar with PCM (PCM을 혼입한 방통 모르타르의 열적 성능 평가에 관한 실험적 연구)

  • Kim, Bo-Hyun;Lee, Han-Seung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.05a
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    • pp.5-6
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    • 2011
  • CO2 reduction is the most urgent issue the world is facing. So, there should be a measure to reduce the CO2 emission in construction industry which has more released CO2 gas than other industries. CO2 emission of building depend on using energy. Then efficient energy use process working efficiently at CO2 reduction. Therefore In this study, author find the technical possibility of saving the building energy using the PCM which is able to control heat, storage heat and potential heat. So, it considered that apply to floor heating type which is major heating system of living space in Korea. And evaluate the Using possibility.

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Study on the Analysis of the CO2 Emissions Reduction Effect through the Development of Internet Real Estate Information in Seoul (인터넷 부동산거래정보 발달에 따른 탄소저감효과 분석)

  • Lim, Mi-Hwa
    • Journal of Information Technology Services
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    • v.12 no.2
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    • pp.73-84
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    • 2013
  • The development of the information on the internet brought a lot of changes in the real estate market. Because the real estate has local distinctiveness and individuality household who want to move must to visit place for housing information. But now household use internet real estate information at every decision-moving step and that is able to reduce not only the cost of real estate information but also social benefit like $CO_2$ emissions reduction effect. In this study, I analyzed the effect of $CO_2$ emissions reduction with Seoul household residential mobility data when household take informations from internet real estate site. As increasing a single family who is good at internet service, the effect of $CO_2$ reduction from the development of the Internet real estate information has more increased.

The Reactivity for the SO2 Reduction with CO and H2 over Sn-Zr Based Catalysts (Sn-Zr계 촉매 상에서 CO와 H2를 이용한 SO2 환원 반응특성)

  • Han, Gi Bo;Park, No-Kuk;Ryu, Si Ok;Lee, Tae Jin
    • Korean Chemical Engineering Research
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    • v.44 no.4
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    • pp.356-362
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    • 2006
  • The $SO_2$ reduction using CO and $H_2$ over Sn-Zr based catalysts was performed in this study. Sn-Zr based catalysts with Sn/Zr molar ratio (0/1, 1/4, 1/1, 2/1, 3/1, 1/0) were prepared by the precipitation and co-precipitation method. The effect of the temperature on the reaction characteristics of the $SO_2$ reduction with a reducing agent such as $H_2$ and CO was investigated under the conditions of space velocity of $10,000ml/g_{-cat.}h$, $([CO(or\;H_2)]/[SO_2])$ of 2.0. As a result, the activity of Sn-Zr based catalysts were higher than $SnO_2$ and $ZrO_2$. The reactivity for the $SO_2$ reduction with CO was higher than that with $H_2$, and sulfur yield in the $SO_2$ reduction by $H_2$ was higher than that by CO. The reactivity for the $SO_2$ reduction with $H_2$ was increased with the reaction temperature regardless of Sn-Zr based catalyst with a Sn/Zr molar ratio. $SnO_2-ZrO_2$ (Sn/Zr=1/4) had highest activity at $550^{\circ}C$, in the $SO_2$ reduction with $H_2$ and $SO_2$ conversion of 94.4% and sulfur yield of 66.4% were obtained at $550^{\circ}C$. On the other hand, in the $SO_2$ reduction by CO, the reactivity was decreased with the increase over $325^{\circ}C$. At the optimal temperature of $325^{\circ}C$, $SO_2$ conversion and sulfur yield were about 100% and 99.5%, respectively, in the $SO_2$ reduction over $SnO_2-ZrO_2$ (Sn/Zr=3/1). Also, the $SO_2$ reduction using syngas with $CO/H_2$ ratio over $SnO_2-ZrO_2$ (Sn/Zr=2/1) was performed in order to investigate the application possibility of the simulated coal gas as the reductant in DSRP. As a result, the reactivity of the $SO_2$ reduction using syngas with $CO/H_2$ ratio was increased with increasing the CO content of syngas. Therefore, it could be known that DSRP using the simulated coal gas over Sn-Zr based catalyst is possible to be realized in IGCC system

Numerical Study of CO Reduction Characteristics in High-temperature Air Stream Diluted with Exhaust Gas (배기가스가 혼합된 고온 공기류에서의 CO 소멸특성에 대한 수치해석 연구)

  • Park, Ji-Woong;Oh, Chang Bo
    • Journal of the Korean Society of Combustion
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    • v.20 no.3
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    • pp.8-12
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    • 2015
  • The CO reduction characteristics of hot air stream diluted with exhaust gas in a perfectly stirred reactor (PSR) were investigated numerically. The dilution ratio ($\Omega$), inlet temperature ($T_{in}$), and residence time ($\tau$) were considered as parameters to investigate the effects of those on the emission indices for CO and $CO_2$ (EICO and $EICO_2$). The roles of dominant reactions and the production rates of major species were analyzed. It was found from the EICO trend that the supplied CO in the air stream was consumed. The EICO increased negatively with $T_{in}$ at fixed $\tau$ regardless of $\Omega$. However, the magnitude of EICO and minimum inlet temperature for CO reduction showed complicated trend according to the variation of $\tau$. It was identified that the OH radical, generated from the reactions, $O_2+H{\leftrightarrow}O+OH$ and $2OH{\leftrightarrow}H+H_2O$, affected the CO reduction by the reaction, $CO+OH{\leftrightarrow}H+CO_2$. However, the CO emission ratio increased at sufficiently high inlet temperature range due to the thermal dissociation of $CO_2$.

Electrocatalytic Reduction of Dioxygen by New Water Soluble Cobalt(II) Tetrakis-(1,2,5,6-tetrafluoro-4-NN'N''-trimethylanilinium)-β-octabromoporphyrin in Aqueous Solutions

  • 최은미;정해상;박덕희;최용국;전승원
    • Bulletin of the Korean Chemical Society
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    • v.20 no.9
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    • pp.1056-1060
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    • 1999
  • New water soluble and highly electron deficient cobalt(II) tetrakis-(1,2,5,6-tertrafluoro-4-NN'N"-trimethyla-nilinium)-β-octabromoporphyrin [Co II (Br8TTFP)(Y)2] was synthesized and used for the electrocatalytic reduction of dioxygen. The first reduction of synthesized [Co II (Br8TTFP)(Y)2] involves one electron process to give metal centered [Co I (Br8TTFP)(Y)2]. The reduction of potential [E1/2 = -0.32 V] of [Co II (Br8TTFP)(Y)2] shifts positively 370 mV compared with that of [Co II (TTFP)(Y)2] due to the substituted bromide to β-pyrrole positions. The electrochemically reduced [Co I (Br8TTFP)(Y)2] binds dioxygen and catalytically reduces it to HOOH by 2e - transfer. Cyclic and hydrodynamic voltammetry at a glassy carbon electrode in dioxygen-saturated aqueous solutions are used to study the electrocatalytic pathway.