• Title, Summary, Keyword: 일산화탄소

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Analysis of Carbon Emissions According to Combustion of Tree Branch, Bark and Living Leaf in Pinus Densiflora (소나무 부위별 연소에 따른 탄소배출량 분석)

  • Park, Young-Ju;Kim, Min-Jung;Lee, Hae-Pyeong
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • pp.385-389
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    • 2010
  • 본 연구에서는 산불발생 시 온실가스의 배출량을 추정하기 위한 기초 연구로서 산림연료의 연소에 따른 탄소배출량을 분석하였다. 산림연료는 소나무를 대상으로 생엽, 가지, 수피 등 부위별로 연소실험을 수행하였으며, 콘칼로리미터를 이용하여 일산화탄소와 이산화탄소의 배출량을 분석하였다. 중량 50g의 연료 기준, 일산화탄소의 배출량은 1.8~4.0g 정도였으며, 이산화탄소의 배출량은 49.3~84.7g 정도를 나타냈다. 부위별로 큰 차이를 나타냈는데 수피는 생엽과 가지보다 상대적으로 많은 일산화탄소와 이산화탄소를 배출하는 것으로 나타났다.

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Photochemical Behavior of Carbon Monoxide in Aqueous Suspension of ZnO (ZnO 수용액중에서 일산화탄소의 광화학적 거동)

  • Chul-Ho Park;Woo-Suk Chang;Yong-Sung Kim;Hyoung-Ryun Park
    • Journal of the Korean Chemical Society
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    • v.47 no.3
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    • pp.213-219
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    • 2003
  • The photochemical transformation of carbon monoxide in aqueous solution has been investigated at $25{\pm}0.1^{\circ}C$using ZnO as a photocatalyst. After irradiation of 253.7 nm UV light in the solution, carboxylation and carbonylation processes were carried out, and the formation of formic acid, oxalic acid, glyoxylic acid, formaldehyde and glyoxal was observed. The formation of the products depended on the pH values in the solution. The yield of formaldehyde and glyoxal increased in acidic solution whereas it decreased in basic solution. When the pH values in the solution increased above 11.5, the yield of formic acid increased rapidly. The initial quantum yields of the products were determined and the probable mechanisms for the reactions were presented on the basis of the products analysis.

CO Tolerance Improvement of MEA Using Metal Thin Film by Sputtering Method in PEM Fuel Cell (스퍼터링 공정으로 제조된 금속박막을 이용한 고분자전해질 연료전지 막-전극접합체의 일산화탄소에 대한 내구성 연구)

  • Cho, Yong-Hun;Yoo, Sung-Jong;Cho, Yoon-Hwan;Park, Hyun-Seo;Sung, Yung-Eun
    • Journal of the Korean Electrochemical Society
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    • v.10 no.4
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    • pp.279-282
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    • 2007
  • When reformer for fuel cell is used, CO in hydrogen gas leads to a seriously decreased membrane electrode assembly (MEA) performance by catalyst poisoning. The effect of CO on performance of modified MEA by sputtering method is studied in this paper. The experimental results show that sputtered Pt and Ru thin film improve a single cell performance of MEA and sputtered metal thin film has a CO tolerance. The air injection process on anode show improved CO tolerance test result. Moreover, Pt, Ru and PtRu thin film by sputtering had influence on the CO tolerance with air injection process.

The Changes of CO Gas Sensing Properties of ZnO and $SnO_2$ with Addition $TiO_2$ ($TiO_2$첨가에 의한 ZnO와 $SnO_2$의 일산화탄소 감응특성 변화)

  • Kim, Tae-Won;Choi, U-Sung;Jun, Seon-Taek
    • Korean Journal of Materials Research
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    • v.8 no.4
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    • pp.312-316
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    • 1998
  • ZnO- TiO$_2$, and Sn0$_2$ - Ti0$_2$ ceramic composites doped with TiO$_2$ were prepared and their electrical and 1000ppm CO gas sensing properties were investigated. The phases of samples were analyzed by XRD, and the microsturctures of the fractured surface of samples were observed by SEM. A carbon monoxide gas sensitivity was de¬fined as the ratio of the resistance in dry air atmosphere(R$drt air$) to the resistance in 1000ppm CO gas atmosphere(R$_co$) The CO gas sensitivity of Smol% Ti0$_2$-added ZnO decreased about 1.7 times compared to that of pure ZnO. On the other hand, the maximum CO gas sensitivity of Ti0$_2$-added SnO$_2$ increased about 2.5 times compared to that of pure SnO$_2$. Therefore, the CO gas sensitivies of SnO$_2$-TiO$_2$ composite were better than those of ZnO- Ti0$_2$ and the temper¬ature range showing the maximum sensitivity for Sn0$_2$-TiO$_2$ composite was lower than that for ZnO- Ti0$_2$.

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Regional Background Levels of Carbon Monoxide Observed in East Asia during 1991~2004 (1991~2004년 동아시아에서 관측한 일산화탄소의 지역적 배경 농도)

  • Kim, Hak-Sung;Chung, Yong-Seung
    • Journal of the Korean earth science society
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    • v.27 no.6
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    • pp.643-652
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    • 2006
  • Data of the carbon monoxide concentration observed in Mt. Waliguan in China (WLG), Ulaan Uul in Mongolia (UUM), Tae-ahn Peninsula in Korea (TAP), and Ryori in Japan (RYO) were analyzed for a long period between 1991 and 2004. The annual average concentration of carbon monoxide was the highest at TAP $(233{\pm}41ppb)$ followed by $RYO(171{\pm}36ppb),\;UUM(155{\pm}26ppb),\;and\;WLG(135{\pm}22ppb)$. The seasonal variations being high in spring and low in summer were observed in other areas of Eastern Asia except WLG. TAP was high in carbon monoxide concentration in all seasons compared to WLG, UUM and RYO and shows wide distribution of concentration in the histogram, which is caused by the influence of large-scale air pollution due to its downwind location close to the East Asian continent, China in particular. Also, our data was compared with data measured at Mauna Loa (MLO) in Hawaii. According to the origin of the isentropic backward trajectory and its transport passage, carbon monoxide concentration observed in TAP was analyzed as follows: continental background airflows (CBG) were $216{\pm}47ppb$; regionally polluted continental airflows (RPC) were $316{\pm}56ppb$; Oceanic background airflows (OBG) were $108{\pm}41ppb$; and Partly perturbed oceanic airflows (PPO) were $161{\pm}6ppb$. The high concentration of carbon monoxide in TAP is due to the airflow from East Asian continent origin rather than that from the North Pacific origin. Especially, RPC which passes through the eastern China appeared to be the highest in concentration in spring, fall, and winter. However, OBG was affected by the North Pacific air mass with a low carbon monoxide concentration in summer. The NOAA satellite images and GEOS-CHEM model simulation confirmed a large-scale air pollution event that was in the course of expansion from southeastern China bound to the Korean Peninsula and the Korea East Sea by way of the Yellow Sea.

Photochemical Reaction of Aqueous Ethanol in the Presence of CO (일산화탄소가 포함된 에탄올 수용액의 광화학 반응)

  • Kim, Hui Jeong;Lee, Hyeong Cheol;Park, Hyeong Ryeon
    • Journal of the Korean Chemical Society
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    • v.38 no.4
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    • pp.271-275
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    • 1994
  • The photochemical reaction of aqueous ethanol saturated with argon and carbon monoxide has been investigated using 184.9 nm UV light. The photochemical reaction of $1{\times}10^{-2}$ M aqueous ethanol saturated with argon results in the formation on the acetaldehyde and 2,3-butanediol. The irradiation of the solution saturated with carbon monoxide causes the formation of carbonylation and carboxylation products such as ${\alpha}$-hydroxypropionaldehyde, formaldehyde, glyoxal, formic acid, oxalic acid and glyoxylic acid in addition to above two products. But in the case of concentrated ethanol solutions, the irradiation did not give carbonylation and carboxylation products. The initial quantum yields of the products were determined and probable mechanisms for the reaction were presented on the basis of product analysis.

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Characteristics of Autoignited Laminar Lifted Flames in Heated Coflow Jets of Carbon Monoxide/Hydrogen Mixtures (일산화탄소/수소 혼합기의 가열된 동축류 제트에서 자발화된 층류 부상화염의 특성)

  • Choi, Byung-Chul;Chung, Suk-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.6
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    • pp.639-646
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    • 2012
  • The characteristics of autoignited lifted flames in laminar jets of carbon monoxide/hydrogen fuels have been investigated experimentally in heated coflow air. In result, as the jet velocity increased, the blowoff was directly occurred from the nozzle-attached flame without experiencing a stabilized lifted flame, in the non-autoignited regime. In the autoignited regime, the autoignited lifted flame of carbon monoxide diluted by nitrogen was affected by the water vapor content in the compressed air oxidizer, as evidenced by the variation of the ignition delay time estimated by numerical calculation. In particular, in the autoignition regime at low temperatures with added hydrogen, the liftoff height of the autoignited lifted flames decreased and then increased as the jet velocity increased. Based on the mechanism in which the autoignited laminar lifted flame is stabilized by ignition delay time, the liftoff height can be influenced not only by the heat loss, but also by the preferential diffusion between momentum and mass diffusion in fuel jets during the autoignition process.

Gamma-Radiolysis of Carbon Dioxide (I). Effect of Addition of Alcohols and Aldehydes (二酸化炭素의 放射線分解 (制1報). 알코올類 및 알데히드類 添加의 影響)

  • Joon Ha Jin;Sang Up Choi;Hyung Chick Pyun;Jae Ho Choi
    • Journal of the Korean Chemical Society
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    • v.26 no.3
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    • pp.135-141
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    • 1982
  • The gamma radiolysis of C$O_2$, in the presence of organic additives, was studied at the total absorbed dose of 6.7 Mrad. Considerable quantity of CO was produced by adding these additives to $O_2$, though no CO was found without them. The maximum G(CO) values of 4.1 and 4.6 were obtained by addition of 0.5% methanol and 0.25% ethanol, respectively. The G(CO) values of 6.3 and 8.4 were noted by the addition of 1% acetaldehyde and 1% formaldehyde, respectively. The maximum CO concentration of 0.65% was obtained by the addition of 1% acetaldehyde at the dose of 40 Mrad.

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Removal of Carbon Monoxide from Anthracite Flue Gas by Catalytic Oxidation (I) (촉매반응에 의한 연탄 연소가스로부터 일산화탄소의 제거 (제1보))

  • Chung Ki Ho;Lee, Won Kook
    • Journal of the Korean Chemical Society
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    • v.20 no.5
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    • pp.431-437
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    • 1976
  • On the condition of adequate air supply, complete removal of carbon monoxide,occurred above $650^{\circ}C$. Using catalysts, the oxidation of carbon monoxide occurred at lower temperatures; on both $MnO_2 \;and\;30%\;MnO_2-70%\;CuO\;at\;250{\circ}C,\;on\;CuO\;at\;450{\circ}C,\;on\;50%\;MnO_2-50%\;CuO\;at\;200{\circ}C,\;and\;on\;70%\;MnO_2-30%\;CuO\;at\;180{\circ}C$. Manganese dioxide (p-type) showed higher activity than cupric oxide (n-type) and a catalyst consisting of 60% $MnO_2-40%$ CuO had the highest activity of all the $MnO_2$-CuO mixture. Over the range of transitional temperature, carbon monoxide removal efficiency decreased linearly with increasing inlet carbon monoxide concentration while temperature was fixed. Residence time of gases in the catalytic reactor, in the range of 0.9 to 1.8 seconds, gave no effect on carbon monoxide conversion.

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A Study on $CO_2$ Sensor Module Using NDIR Method (비분산 적외선 방식의 $CO_2$ 센서 모듈에 관한 연구)

  • Kim, Gyu-Sik;Oh, Joon-Tae;Kim, Jo-Chun
    • Proceedings of the KIEE Conference
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    • pp.127-128
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    • 2008
  • 본 연구에서는 비분산 적외선 방식을 이용한 일산화탄소, 이산화탄소 듀얼 센서 모듈을 실현한다. 비분산 적외건 방식은 가스분자가 특정 파장의 적외선을 흡수하는 특성을 이용하여 가스의 적외선 흡수도를 측정하여 농도로 환산하는 방식이다. 비분산 적외선 방식은 수명이 길고 정밀도가 높아 기존의 접촉식(화학식) 센서에 비해 우수한 특성을 가지고 있다. 중요한 기술은 NDIR의 핵심부분인 광 공동의 설계 기술과 센서의 성능을 최종 결정짓는 농도-온도 교정 기술이다. 현재까지 개발된 광공동 기술은 $CO_2$ 센서의 단일 센서 방식이었다. 본 연구에서는 이 기술을 접목한 일산화탄소까지 동시에 측정할 수 있는 광 공동기술과 교정기술을 연구개발하여 하나의 광 공동으로 이산화탄소와 일산화탄소를 동시에 측정 할 수 있는 고기능 센서를 실현하는 것이다.

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