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철 - 수증기 반응에 의한 수소생성에 미치는 금속산화물의 첨가효과
이대행,문희,박홍철 ( Dae Haeng Lee,Hee Moon,Heung Chul Park ) 한국공업화학회 1991 공업화학 Vol.2 No.1
금속산화물 CuO, In_2O_3, MoO_3, WO_3을 첨가시킨 환원철에 의한 수증기로부터 수소생성을 반응속도론적 관점에서 조사하였다. 첨가제는 수소생성에 대한 활성증진효과를 나타내었으며, 크기의 순서는 MoO_3>> In_2O_3 ○ WO_3 ○ CuO 이었다. 속도해석에서 반응완료시간을 예측하기 위하여 수축 핵 모델(Shrinking Core Model) 을 적용한 추산결과는 실험치와 대체로 잘 일치하였다. 상압 유동식 반응장치를 이용하여 600-750℃의 온도와 첨가제의 양 lwt%, Ar유량 1L/min, 수증기분압 0.085 atm에서 얻어진 겉보기 활성화에너지는 환원철 단독의 경우 27.9kJ/mol, 첨가제 MoO_3는 14.2, In_2O_3는 20.9, WO_3은 21.3, CuO는 22.4kJ/mol을 각각 나타내었다. The prodution of hydrogen from steam by reduced iron with additives such as CuO, In_2O_3, MoO_3 and WO_3 has been kinetically investigated. It was shown that all additives have a promoting effect on reaction activity in the order of MoO_3>> In_O_3 ○ WO_3 ○ CuO. The shrinking core model was applied to predict the complete conversion time and the results were quite comparable with experimental values. The reaction was carried out in a fixed flow reactor packed with reduced iron with 1 wt % of additives under the conditions, 600-750 ℃, Ar flow rate of 1 L/min and steam partial pressure of 0.085 atm. The apparent activation energies were 14.2, 20.9, 21.3, 22.4 and 27.9k/mol with CuO, In_2O_3, MoO_3, WO_3, CuO and without additive, respectively.
이대행,김민희,박옥현,박강수,안상수,서희정,진승현,정원삼,강영주,안기완,김은선,Lee, Dae-Haeng,Kim, Min-Hee,Park, Ok-Hyun,Park, Kang-Soo,An, Sang-Su,Seo, Hee-Jeong,Jin, Seung-Hyun,Jeong, Won-Sam,Kang, Yeong-Ju,An, Ki-Wan,Kim, Eun-Sun 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.3
Objectives: A great number of people visit forests for their bountiful healing factors. We investigated the quantity of terpene and analyzed the correlations with meteorological and environmental factors at Mt. Mudeung in order to support public health. Methods: The terpene amounts were investigated along 11 main trails using stainless steel tube packed by Tenax TA (150 mg) and Carbopack B (130 mg) during March to November 2012. Terpene amounts of 20 species (${\alpha}$-pinene, camphene, etc.), and meteorological and environmental factors were investigated in the field. Results: Terpene of 16 species was released from the forest and total terpene amounts were 2,080 pptv at the site of Chamaecyparis obtusa, the highest among 11 sites, nearby the first reservoir on Mt. Mudeung. Terpene concentrations in the forest were nine to 23 times higher than found in urban areas. Total terpene amounts had positive correlations with temperature, humidity, carbon dioxide and oxygen (p<0.01) with $R^2$ of 0.345, 0.369, 0.591, 0.145, respectively, from April to July. Wind speed and solar radiation in the forest had a negative correlation with terpene amounts and showed statistical insignificance with p-values of 0.118 and 0.233, respectively. Conclusions: This study suggests that the amounts of terpene around Mt. Mudeung are indeed higher, so visitors may enjoy a therapeutic walk in the forest with a healing effect. These results showed the forest was very effective for improving human health.
광주광역시 대기오염측정소 주변 교통량이 대기질에 미치는 영향
이대행,안상수,송형명,박옥현,박강수,서광엽,조영관,김은선,Lee, Dae-Haeng,An, Sang-Su,Song, Hyeong-Myeong,Park, Ok-Hyun,Park, Kang-Soo,Seo, Gwang-Yeob,Cho, Young-Gwan,Kim, Eun-Sun 한국환경보건학회 2014 한국환경보건학회지 Vol.40 No.3
Objectives: Vehicular emissions are one of the main sources of air pollution in urban areas. Correlation analysis was conducted between air pollutants and traffic volume in order to identify causes of air pollution in Gwangju. Methods: Using traffic volumes and air quality monitoring data from 2002 to 2012 from nine stations (seven urban areas, two roadside areas), especially at three sites where traffic volumes were high, the correlation coefficients were obtained between air pollutants as PM-10 (particulate matter), $NO_2$, $SO_2$, CO and $O_3$ at the stations and traffic volumes near the air monitoring stations. Results: Due to traffic volume and distance between the station and the traffic road, concentrations of pollutants at roadside areas were higher than at urban areas, with the exception of $O_3$. The concentration of $O_3$ showed statistically significance with those of other gas materials as $NO_2$, $SO_2$, and CO in winter (p<0.001) and spring (p<0.05). During the period of October 7 to 20, 2012, excluding periods of yellow dust, smog and rainy season, the ratio of $NO/(NO+NO_2)$ showed the highest value 0.57 and 0.40 at Unam and Chipyeong of two roadside stations, followed by 0.35 at Nongseong with vehicular effects. The correlation coefficient between traffic volume and $O_3$, CO, $NO_2$ became higher when the data on mist and haze days were excluded, than when all hourly data were used in that period, at the three sites of Unam, Chipyeong, and Nongseong. Conclusions: Air quality showed a considerable effect from vehicles at roadside areas compared to in urban areas. Air pollutant diminishment strategies need to be aggressively adopted in order to protect atmospheric environment.
D-64 : The Effects of Coagulation Process for the reuse of Gwangju Sewage Effluent
이대행,정원삼,김난희,민경우,서희정,백계진,김찬중,문희 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
Water quality in Gwangju sewage effluent was investigated for water reuse during the period of Jan 2003 to June 2004. Alum and poly aluminium chloride (PACl) as coagulants were used to reduce color, turbidity, total phosphorus (TP) and total organic carbon (TOC) in sewage effluents. Monthly mean values of BOD, SS, turbidity, total phosphorus and color in 2003 were 4.1 mg/L, 2.9 mg/L, 0.9 NTU, 1.3 mg/L, and 24.8 unit in sewage effluent, respectively. Jar-test was executed to investigate the removal effects of color, turbidity and TP in the effluent under the coagulation condition of 5 minute fast mixing, 15 minute slow mixing and 1 hr precipitation. Alum with 8% Al2O3 content showed optimum removal rate of 65 % for turbidity and 97 % for dissolved (D) TP with 100 mg/L dosage. However the removal of dissolved color (DC) increased in proportion to the coagulant dosage reaching up to 300 mg/L. PACl with 10% Al2O3 content showed somewhat same tendency in the removal of DC and DTP, except for turbidity. The optimum removal range was widely distributed from 80 mg/L to 220 mg/L when PACl was used as coagulant. This result will be applied for setting optimum operating conditions for Coagulation/Membrane hybrid system.