• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2008년도 International Symposium on Remote Sensing
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• pp.200-203
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• 2008

The objective of this study is to produce the $CO_2$ (carbon dioxide) absorption map using KOMPSAT-2 imagery. For estimating the amount of $CO_2$ absorption, the stand biomass of forest was estimated with the total weight, which was the sum of individual tree weight. Individual tree volumes could be estimated by the crown width extracted from KOMPSAT-2 imagery. In particular, the carbon conversion index and the ratio of the $CO_2$ molecular weight to the C atomic weight, reported in the IPCC (Intergovernmental Panel on Climate Change) guideline, was used to convert the stand biomass into the amount of $CO_2$ absorption. Thereafter, the KOMPSAT-2 imagery was classified with the SBC (segment based classification) method in order to quantify $CO_2$ absorption by tree species. As a result, the map of $CO_2$ absorption was produced and the amount of $CO_2$ absorption was estimated by tree species.

• 한국산학기술학회논문지
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• 제10권3호
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• pp.602-606
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• 2009

나트륨계 흡수용액의 이산화탄소흡수특성을 알아보기 위하여 회분식 기-액 흡수평형 반응기를 이용하여 $Na_{2}CO_{3}$ 5%, 10%, 15%, 20% 수용액에 대한 이산화탄소 흡수능 및 초기흡수속도를 측정하였으며 반응온도는 $40^{\circ}C$이었다. 또한, 알칼리염계 흡수제($KHCO_3$, $CaCO_3$, $K_{2}CO_{3}$)들의 혼합에 따른 초기흡수속도를 비교하였다. 농도에 따른 실험결과 10%의 $Na_{2}CO_{3}$에서 가장 좋은 흡수능 및 흡수속도를 보였고, 알칼리염계 흡수제들 중에서 $K_{2}CO_{3}$와 혼합할 때 흡수속도가 다소 증가되었다. $Na_{2}CO_{3}$ 5% 용액의 초기흡수속도를 개선시키기 위하여 Pz와 Pp를 각각 첨가하여 실험한 결과, 증진제를 첨가함으로써 초기흡수속도를 증가시킬 수 있었다.

• 한국산학기술학회논문지
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• 제12권2호
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• pp.993-998
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• 2011

기액 흡수평형(VLE)장치를 사용하여 연소전 조건에서 흡수용액인 $K_2CO_3$의 이산화탄소 흡수능 및 초기흡수속도를 측정하였다. 흡수실험은 온도 $40{\sim}80^{\circ}C$, 이산화탄소 압력 0~50기압 범위에서 수행되었으며, 또한 흡수용액 중 $K_2CO_3$ 농도에 따른 흡수능 변화도 조사하였으며 이때 농도변화는 5~20%이었다. 실험결과, 흡수용액 중 $K_2CO_3$ 농도가 증가할수록 이산화탄소 흡수능과 초기흡수속도는 증가하였으며, 반응온도에 따른 초기흡수속도는 $40^{\circ}C$에서 가장 높았다. $K_2CO_3$ 흡수용액의 흡수능을 증진시키기 위해 Piperazine과 homopiperazine을 각각 첨가하여 흡수 실험한 결과 Piperazine을 첨가한 경우가 이산화탄소 흡수능을 다소 증진시킴을 알 수 있었다.

• Journal of Industrial and Engineering Chemistry
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• 제68권
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• pp.335-341
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• 2018

We report the catalytic effects of metal oxides on the $CO_2$ absorption rate in an aqueous potassium salt of ${\text\tiny{L}}-lysine-HCl$ using the vapor liquid equilibrium method. The best $CO_2$ absorption rate obtained through testing metal oxides in a highly concentrated potassium salt of amino acids (2.0 M) was identified using CuO. The recyclability of the metal oxides was tested over three cycles. The catalyst CuO was found to enhance the absorption rate of $CO_2$ by 61%. A possible mechanism was proposed based on NMR spectroscopy studies. Further, the effect of change in liquid absorbent viscosity on $CO_2$ absorption is discussed.

• Bulletin of the Korean Chemical Society
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• 제13권5호
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• pp.553-556
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• 1992

The ${CO}_2$ laser absorption measurement of ${CH}_3{CH}_2Br$ utilizing photoacoustic (PA) technique was performed using a cw and a pulsed ${CO}_2$ lasers. The absorption profile in the ${CO}_2$ laser wavelength region (9-10 ${\mu}$m) and the macroscopic small signal absorption cross section at 10P(20) (10.59 ${\mu}$m, 944 $cm^{-1}$) laser line were measured using a cw ${CO}_2$ laser. The laser fluence dependence on infrared multiphoton absorption (IRMPA) was also studied with a pulsed TEA ${CO}_2$ laser at 10P(20) laser line. In view of monotonic increase of PA signal with the rise of laser fluence, it was suggested that the anharmonicity in pumped vibration mode did not restrict ir multiphoton absorption in ${CH}_3{CH}_2Br$ system as found in large molecular system.

• Korean Journal of Chemical Engineering
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• 제39권
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• pp.1028-1035
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• 2022

MgO-based sorbents were prepared by impregnation with K₂CO₃ at different loadings. This study examined the CO₂ absorption and regeneration properties of MgO-based sorbents at various pressures. The CO₂ capture capacity of the PMI-30 sorbent increased to 204.4 mg CO₂/g sorbent with increasing absorption pressure through CO₂ absorption by MgO itself and K₂CO₃ by generating structures, such as MgCO₃·3H₂O and K₂Mg(CO₃)₂. However, no KHCO₃ phase was observed after CO₂ absorption at 1, 10, and 20 atm. The CO₂ capture capacity of the MgO and PMI-10, 20, 30, and 40 sorbents was the 94.6, 129.9, 156.6, 204.4, and 239.4 mg CO₂/g sorbent, respectively. The CO₂ capture capacity of MgO in the PMI sorbent was relatively constant regardless of the decreasing MgO content and increasing K₂CO₃ content. The CO₂ absorption ability of MgO was calculated by substracting theoretical CO₂ capture capacity of K₂CO₃ from the total capacity of sorbents. The TPD experiment performed at 1 atm after CO₂ absorption at 20 atm showed that the regeneration temperature of the PMI sorbents differed according to the K₂CO₃ loading.

• 공업화학
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• 제23권6호
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• pp.624-629
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• 2012

온실가스의 주요성분인 이산화탄소를 포집 및 회수하기 위해 세라믹 종이로 만든 허니컴에 $K_2CO_3$를 담지 시켜 이산화탄소 흡수특성을 알아보았다. $70^{\circ}C$, 66% RH 항온항습 조건에서 $K_2CO_3$를 담지 시킨 허니컴 흡수제의 이산화탄소 흡수량은 13.8 wt%를 나타내었다. 이러한 결과는 $K_2CO_3$ 담지율 17.6 wt%와 거의 동일한 수준으로서 허니컴 흡수제에 담지된 $K_2CO_3$의 흡수 반응이 원활하게 진행되었음을 확인할 수 있었다. 또한, 허니컴 흡수제를 충진한 반응기에 4.51% 이산화탄소와 수분 동시공급 또는 수분 선 공급 후 이산화탄소를 공급하여 $50{\sim}80^{\circ}C$ 범위에서 이산화탄소 흡수 후 파과특성을 분석하였다. 그 결과 수분을 먼저 공급한 후 건조된 이산화탄소를 공급했을 때 더욱 늦게 파괴되어 흡수 반응이 좋아짐을 알 수 있었다. 흡수제와 이산화탄소의 흡수 반응에서의 생성물인 $KHCO_3$는 $128^{\circ}C$에서 이산화탄소를 탈착하여 재생된다는 것을 Temperature Programmed Desorption (TPD)분석 결과를 통해 확인할 수 있었다.

• Bulletin of the Korean Chemical Society
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• 제33권7호
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• pp.2325-2332
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• 2012

A series $[C_3Omim]$[X] of imidazolium cation-based ILs, with ether functional group on the alkyl side-chain have been synthesized and structure of the materials were confirmed by various techniques like $^1H$, $^{13}C$ NMR spectroscopy, MS-ESI, FTIR spectroscopy and EA. More specifically, the influence of changing the anion with same cation is carried out. The absorption capacity of $CO_2$ for ILs were evaluated at 30 and $50^{\circ}C$ at ambient pressure (0-1.6 bar). Ether functionalized ILs shows significantly high absorption capacity for $CO_2$. In general, the $CO_2$ absorption capacity of ILs increased with a rise in pressure and decreased when temperature was raised. The obtained results showed that absorption capacity reached about 0.9 mol $CO_2$ per mol of IL at $30^{\circ}C$. The most probable mechanism of interaction of $CO_2$ with ILs were investigated using FTIR spectroscopy, $^{13}C$ NMR spectroscopy and result shows that the absorption of $CO_2$ in ether functionalized ILs is a chemical process. The $CO_2$ absorption results and detailed study indicates the predominance of 1:1 mechanism, where the $CO_2$ reacts with one IL to form a carbamic acid. The $CO_2$ absorption capacity of ILs for different anions follows the trend: $BF_4$ < DCA < $PF_6$ < TfO < $Tf_2N$. Moreover, the as-synthesized ILs is selective, thermally stable, long life operational and can be recycled at a temperature of $70^{\circ}C$ or under vacuum and can be used repeatedly.

• 한국대기환경학회지
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• 제17권5호
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• pp.407-414
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• 2001

In this study, the absorption kinetics of $CO_2$onto a mixture of AMP (2-amino-2-methyl-1-propanol) MEA (monoethanolamine) water were investigated at 30 and 4$0^{\circ}C$ using a packed absorption tower. Solubility and absorption rate of $CO_2$into alkanolamine solutions and optimal condition of $CO_2$absorption process were investigated. The experimental conditions are as follows; temperature of 30 and 4$0^{\circ}C$, gas flow rate of 3ι/min for the absorption tower, and liquid flow rate of 0.1ι/min. Feed gas was a mixture of 85% $N_2$and 15% $CO_2$. The experimental results showed that AMP had greater solubilities and faster absorption rates than MEA and DEA. In addition, MEA had the fastest initial reaction rate. To improve the properties of AMP which have low initial reaction rate and high cost, AMP was used with MEA. The mixing ratio was also changed in constant total molarity of 1,2,3 and 4. The experimental results can be summarized as follows: (1) in solubility experiment, the addition of MEA in constant total polarity decreased the solubility of $CO_2$in AMP/MEA mixture. (2) from 0 to about 0.3 in mixing ratio, the solubility of $CO_2$in AMP/MEA mixture had little differences compared with the sum of solubility of AMP only and solubility of MEA only . (3) mixing ratio of 0.3 was found to be an optimal point with the fastest $CO_2$absorption rate.

• 한국대기환경학회지
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• 제23권5호
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• pp.539-546
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• 2007

Increasing emission of $CO_2$ significantly effects the global warming. Chemical absorption is one of separation methods of $CO_2$ from the industrial flue gases. In this study, the $CO_2$ removal efficiency as well as the $CO_2$ absorption amount of aqueous AMP (2-amino-2-methyl-1-propanol) solutions were measured using the continuous absorption and regeneration apparatus. We investigated the effect of aqueous AMP+AEPD(2-amino-2-ethyl-1, 3-propanediol) and AMP+TIPA (triisopropanolamine) solutions to enhance absorption characteristics of AMP. As a result of this study, the absorption amount and $CO_2$ removal efficiency were increased with adding TIPA into 30 wt.% AMP. The absorption amount and $CO_2$ removal efficiency of aqueous 30 wt.% AMP+5 wt.% TIPA solution were $1.70\;kg-CO_2/kg-absorbent$ and 91.1%, while those of aqueous 30 wt.% AMP solution were $1.58\;kg-CO_2/kg-absorbent$ and 89.3%. In addition, aqueous 30 wt.% AMP+5 wt.% TIPA solution used in the study revealed the high stripping efficiency, which was almost 98%, at the temperature of $110^{\circ}C$. Thus, the temperature of regenerator should be operated at $110^{\circ}C$.