백금 코팅 메탈필터소재의 Soot 산화반응에 대한 활성 연구

홍성창 ( Sung Chang Hong ),김성수 ( Sung Su Kim ),이상문 ( Sang Moon Lee ),장두훈 ( Du Hun Jang ),배세현 ( Se Hyun Bae ) 한국공업화학회 2011 공업화학 Vol.22 No.4

백금이 코팅된 메탈 필터 소재의 NOx, soot 산화반응의 안정성 및 활성에 대하여 연구하였다. NOx와 soot 산화실험은 독립 또는 동시에 반응시킨 조건으로 수행되었다. 그 결과, 백금이 코팅된 소재는 20%의 NO의 NO2로의 전환반응, 약 10%의 NOx 분해반응 그리고 soot의 완전산화반응이 진행됨을 보였다. Soot 산화반응은 NO2의 생성으로 인하여 반응온도가 더 저온으로(약 30 ℃) 이동할 수 있었다. 코팅 소재는 Pt/Al2O3 또는 Pt/TiO2 촉매보다 표면구조의 안정성 으로 인하여 열충격에 대한 내구성이 우수하였다. The activity and stability of the metal filter material Pt coated on NOx and soot oxidation were examined. The catalytic reaction test for NOx and soot were also performed independently and simultaneously. As a result, it showed the NO to NO2 shift reaction with 20% conversion, NOx decomposition (about 10%) and perfect soot oxidation on the material Pt coated proceeded. Onset temperature of soot oxidation shift to lower temperature (about 30 ℃) by generated NO2. The material also was less affected by thermal shock than Pt/Al2O3 or Pt/TiO2 catalysts due to its stability of surface structure.

CaCO₃ 를 함유한 폐제지슬러지를 이용한 SO₂ 의 배출제어

홍성창(Sung Chang Hong),김상범(Sang Bum Kim),김영훈(Young Hun Kim) 大韓環境工學會 1996 대한환경공학회지 Vol.18 No.3

석탄 fly ash 의 정전하특성 및 전하분포의 측정

홍성창(Sung Chang Hong),조영민(Young Min Jo) 大韓環境工學會 1996 대한환경공학회지 Vol.18 No.5

벼 광합성과 수량에 미치는 TiO2 처리 효과

홍성창 ( Seung Chang Hong ),신평균 ( Pyung Gyun Shin ),장안철 ( An Cheol Chang ),김상효 ( Sang Hyo Kim ),이기상 ( Ki Sang Lee ),이철원 ( Chui Won Lee ) 한국토양비료학회 2006 한국토양비료학회 학술발표회 Vol.2006 No.-

배가스 중 SO2가 V/TiO2 SCR활성에 미치는 영향

홍성창 ( Sung Chang Hong ) 한국공업화학회 2006 공업화학 Vol.17 No.5

새만금 간척지 지역 대기 암모니아 농도

홍성창 ( Hong Sung-chang ),김민욱 ( Kim Min-wook ),김진호 ( Kim Jin-ho ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-

The Jeonbuk region has a higher concentration of particulate matter than the national average. The Saemangeum reclaimed land is located across Gunsan, Gimje, and Buan-gun. Therefore, it is necessary to evaluate the impact of the Saemangeum reclaimed land on the air quality in the Jeonbuk region. Atmospheric ammonia concentrations were measured from June 2020 to February 2021 using a passive sampler. In winter, the ammonia concentration was highest in the order of Buan, Gimje, Gunsan, and Jangjado island(background concentration). The concentration was 13 to 16 ppb and the background concentration was 10 ppb. In summer, Gimje, Buan, Gunsan, and Jangjado were highest in order. The concentration was 14 to 17ppb and the background concentration was 12ppb. Thus, atmospheric ammonia concentrations varied seasonally. The atmospheric NO2 concentrations tended to be higher in Buan, Gimje, Gunsan, and Jangjado in order. But there was a significant difference. As a result of measuring from June to October using CRDS analyzer, it decreased from June to September, which is the summer season, but increased from October. In summer the concentration of ammonia decreases due to the washing effect of rainfall and moisture, but it is necessary to evaluate the absorption of ammonia in the atmosphere by the crop cultivation.

심층시비에 의한 논과 밭 토양의 암모니아 배출 저감 효과

홍성창 ( Hong Sung-chang ),김진호 ( Kim Jin-ho ) 한국환경농학회 2022 한국환경농학회 학술대회집 Vol.2022 No.-

Ammonia emitted by the application of nitrogen fertilizers in agricultural land is an environmental pollutant that catalyzes the formation of fine dust, a short-lived climate change pollutants (SLCP’s). 15∼18% of nitrogen fertilizer input for crop cultivation is emitted as ammonia gas, which is a loss of nitrogen fertilizer component in agricultural land. It is estimated that the annual emission of ammonia from agricultural land in Korea is 18,799 tons in 2019. Fertilizer spraying method that is widely practiced in agricultural fields is spraying on the surface of farmland and then mixing it with the soil through rotary work, etc. In this study, in order to develop a method to reduce the emission of ammonia by nitrogen fertilizers from the soil surface, 2 g of each of the N, P, and K were added to each soil depth inside the glass greenhouse and the ammonia emission was analyzed. The treatment contents were no-fertilization, conventional fertilization, and soil depth of 10 cm, 15 cm, 20 cm, 25 cm, and 30 cm. The paddy soil continued to be maintained by filling the pot with water immediately after treatment, and the upland soil was periodically replenished with water to maintain an appropriate moisture content. Ammonia was collected using a self-manufactured vertical wind tunnel chamber, and ammonia was quantified by the indole phenol blue method. Ammonia emissions were quantified by collecting and quantifying each day after fertilizer treatment by soil depth. As a result of analyzing ammonia emission after fertilizer treatment by soil depth, ammonia was emitted from conventional fertilization immediately after treatment in paddy soil, and there was no ammonia emission at a soil depth of 10 to 30 cm. In the upland soil, ammonia was emitted from the conventional fertilizing plant after 4 days after treatment, and a trace amount of ammonia was emitted from 9 days after the treatment in the fertilizer-treated plot with a soil depth of 10 cm. In conclusion, rather than the current fertilization method of spraying and mixing on the soil surface, it was considered as a new fertilization method to reduce ammonia emission by injecting nitrogen fertilizer into the soil of 10 cm or more in paddy fields and 15 cm or more in upland fields.

상승온도 처리에 의한 논과 밭 용수의 질소변화

홍성창 ( Hong Sung-chang ),장은숙 ( Jang Eun-suk ),허승오 ( Hur Seung-oh ),최순군 ( Chio Soon-kun ),유선영 ( Yu Sun-young ),이규현 ( Lee Gyu-hyen ),김경식 ( Kim Kyeong-sik ) 한국환경농학회 2019 한국환경농학회 학술대회집 Vol.2019 No.-

Temperature increases due to climate change are affecting various sectors of agriculture. Elevated temperatures can affect the growth and yield of crops and can also affect the utilization efficiency of nutrient input materials such as soil nutrients, chemical fertilizers, and compost. The outflow of non-point pollutant sources from farmlands is strongly influenced by physical factors such as rainfall, rainfall intensity, and slope of agricultural land. In order to simulate the outflow of non-point pollutant sources due to climate change, it is necessary to find out not only the physical factors but also the changes in the biological factors induced by the elevated temperature in detail. Temperature is one of the most important environmental factors controlling the growth and yield of plants, and the rate of reaction depends on temperature in all biological processes. Elevated temperatures increase nitrogen mineralization and net nitrification rate. The degradation, absorption, utilization, and outflow of the variety of nutrient input materials for crop cultivation can differ due to temperature rise. This study was carried out to investigate the changes of nitrogen in the nutrients of the cultivated waters by cultivating rice and maize in pots after simulating climate change and by establishing an elevated temperature environment with the chemical fertilizer and livestock compost. The elevated temperature environment was established using the modified medium open-top chamber whose width is 6m and height is 3m. The medium open-top chamber has a merit of increasing only temperature while maintaining the environmental factors such as rainfall, wind, and sunlight intensity similar as those in the field. The maximum temperature in the open-top chamber measured on the 15th of May, 2018 was higher by 2.7℃ than the field, while the average temperature was higher by 0.4℃ so that the elevated temperature could be applied to the rice and maize throughout the growth period. The rice and maize were planted in Wagner pots filled with sandy loam and clay loam, and then placed in a medium open-top chamber and grown at elevated temperatures. The analysis results of nitrogen by periodically collecting the cultivation water from the Wagner pots during the cultivation period of the rice and maize showed that the NO₃―N concentration in the paddy cultivation water was decreased in the no-fertilization block, chemical fertilizer treated block, and cow dung compost treated block in the paddy cultivation sandy loam under elevated temperature compared to those in the field. Meanwhile, the NH₄― N concentration was increased in the rice cultivation clay loam soil in all the treated blocks compared to the field. The NO₃―N concentration in the cultivated water was decreased in all the treatment blocks in the maize cultivation clay loam soil by the elevated temperature than that of field. However, NH₄―N concentration in the water from the maize cultivation sandy loam soil, as well as the clay loam soil with the chemical fertilizer, was increased by elevated temperature compared to the field. The results indicate that the nitrogen changes in the water of the paddy field and upland are induced under the elevated temperature. The outflow of the non-point pollutant sources towards the water system near the cultivation fields also can be changed by rainfall.

새만금 간척지 지역 미세먼지 특성

홍성창 ( Hong Sung-chang ),김민욱 ( Kim Min-wook ),김진호 ( Kim Jin-ho ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-

The Jeonbuk region is an area with high concentration of particulate matter. Due to environmental changes in the Saemangeum reclaimed land with an area of 219 ㎢, it is necessary to evaluate the impact of the particulate matter in the Jeonbuk region. Particulate matter was measured from June in 2020, the Jangjado island the westernmost region, was set as the background concentration, and three measurement station were installed around the Saemangeum reclaimed land area. In addition, the concentration of particulate matter and air pollutants were measured by installing an intensive air quality measurement station in the Kehwa rice experiment station nearby Saemangeum reclaimed land. The concentrations of PM10 and PM2.5 were highest in the order of Gimje, Buan, Gunsan, and Jangjado(background concentration) area in June. However, it has changed seasonally. The total suspended particle(TSP) was high in Gimje and Buan, where compartment and leveling work are actively underway. The concentration of PM10, PM2.5, NO₂, SO₄, O₃ were measured lower than that of the urban air quality monitoring station located in the nearby area. It was needed that longer-term air quality monitoring was necessary for accurate impact assessment.

새만금 간척지 지역 공기 중 암모니아 농도의 연간 분포

홍성창 ( Sung-chang Hong ),김민욱 ( Min-wook Kim ),김진호 ( Jin-ho Kim ) 한국환경농학회 2021 한국환경농학회지 Vol.40 No.4

BACKGROUND: More recently, it has been shown that atmospheric ammonia (NH₃) plays a primary role in the formation of secondary particulate matter by reacting with the acidic species, e.g. SO₂, NOx, to form PM2.5 aerosols in the atmosphere. The Jeonbuk region is an area with high concentration of particulate matter. Due to environmental changes in the Saemangeum reclaimed land with an area of 219 ㎢, it is necessary to evaluate the impact of the particulate matter and atmospheric ammonia in the Jeonbuk region. METHODS AND RESULTS: Atmospheric ammonia concentrations were measured from June 2020 to May 2021 using a passive sampler and CRDS analyzer. Seasonal and annual atmospheric ammonia concentration measured using passive sampler was significantly lower in Jangjado (background concentration), and the concentration ranged from 11.4 ㎍/㎥ to 18.2 ㎍/㎥. Atmospheric ammonia concentrations in Buan, Gimje, Gunsan, and Wanju regions did not show a significant difference, although there was a slight seasonal difference. The maximum atmospheric ammonia concentration measured using the CRDS analyzer installed in the IAMS near the Saemangeum reclaimed land was 51.5 ㎍/㎥ in autumn, 48.0 ㎍/㎥ in summer, 37.6 ㎍ /㎥ in winter, and 32.7 ㎍/㎥ in spring. The minimum concentration was 4.9 ㎍/㎥ in spring, 4.2 ㎍/㎥ in summer, and 3.5 ㎍/㎥ in autumn and winter. The annual average concentration was 14.6 ㎍/㎥. CONCLUSION(S): Long term monitoring of atmospheric ammonia in agricultural areas is required to evaluate the formation of fine particulate matter and its impact on the environment. In addition, continuous technology development is needed to reduce ammonia emitted from farmland.