TiO₂ 광촉매의 Acetaldehyde 광분해 특성

서성규,이선원,정상철,정채훈 한국공업화학회 2001 한국공업화학회 연구논문 초록집 Vol.2001 No.-

최근 대기오염물질 중 휘발성 유기화합물(VOCs: volitale organic compounds)에 대한 관심의 집중과 처리기술에 대한 연구가 활발히 진행되고 있다. 이들 처리기술은 촉매소각, 열소각, 흡착, 흡수 및 응축 등 여러 가지 원리가 이용되고 있다. 최근 다방면에서 관심의 대상이 되는 TiO₂를 이용한 광촉매 산화는 저온연소, 내화학성, 폭발위험이 적고, 수분에 대한 활성저하가 없는 장점을 가지고 있다. TiO₂ 광촉매는 대부분 졸겔법에 의해 제조되어 왔으나, 불순물의 잔존과 결정의 결함이 많아 촉매의 활성을 저하시키는 전자와 정공의 재결합 현상이 많이 발생하는 문제점을 가지고 있다. 따라서, 본 연 구에서는 CVD(chemical vapour deposition)법으로 anatase 결정구조의 TiO₂막을 Alumina ball에 코팅 하여 제조한 광촉매를 이용하여 acetaldehyde 분해특성에 관하여 연구하였으며, hybrid system 구성기술로서의 가능성을 파악하였다. 반응물인 acetaldehyde는 일정온도로 유지되는 항온조를 이용하여 head space 방식을 이용하여 TiO₂ 광촉매가 충진된 반응기에 연속적으로 공급한 후, UV-C(λmax=253.7nm, 10w)를 조사하여 acetaldehyde 분해특성을 GC(SHIMADZU, GC-8A)로 분석하였다. 실험시 유량은 60cc/min, acetaldehyde 농도는 1 mol%미만의 농도로 공급하였다. Acetaldehyde의 광촉매 분해 생성물로는 CO₂, H₂O, HCHO, HCOOCH₃, CH₄, CO 등이 관찰되었다. 광촉매의 경시변화를 측정한 결과 48시간 동안 전화율은 일정하게 유지되었으며, 반응 시간의 경과에 따른 활성변화는 관찰되지 않아 경제적이고 안정성이 높은 VOCs 처리 기술로서의 가능성을 보았다.

환경친화적 고체연료 개발 : 패각 및 석탄의 특성과 탈황반응

서성규,황원준 國立 麗水大學校 環境問題硏究所 2000 環境硏究論文集 Vol.3 No.-

In this study, characteristics of sea shell, coal and desulfurization have been investigated in order to examine the feasibility on the development of the clean solid fuel. Physico-chemical properties of waste sea shells and limestone have been characterized by using BET, XRD, and SEM. The main component of oyster shell was CaCO_(3) similar to limestone. After calcination of oyster shell, specific area decreased, and pore diameter increased. Under this experimental conditions, desulfurization efficiency of sea shells was the range of 49.1~61.7%. The desulfurizer capacity and efficiency of oyster shell were higher than others. The best fit desulfurization condition of oyster shell based on economy and desulfurization efficiency was as follows : particle size = 90~150㎛, and Ca/S =1.5~3.0. We can conclude that wasted sea shells can be used as a desulfurizer on the development of clean solid fuel

코발트 담지 촉매상에서 아세트알데히드의 연소

서성규,유형선,김상채 한국공업화학회 2001 한국공업화학회 연구논문 초록집 Vol.2001 No.-

VOCs 처리에 촉매연소를 이용하는 경우, 사용되는 촉매는 귀금속(Pt, Pd 등)계 및 금속산화물 촉매로 크게 분류할 수 있다. 귀금속 촉매의 경우,높은 활성과 열적 내구성이 뛰어나지만, 경제적 부담이 크다는 문제점이 있다. 비용이 저렴한 금속산화물 촉매의 경우, 부분연소생성물로 인한 완전연소의 어려움이 있어, 금속산화물 촉매의 활성 증가를 위해 조촉매 및 우수한 지지체(카본블랙, SiO₂, Al₂O₃, TiO₂ 등)를 이용하여, 새로운 담지 촉매를 개발하는 많은 연구들이 보고되고 있다. 다양한 지지체중 비교적 경제적이고, 비표면적이 큰 카본물질(카본블랙, 활성탄, 흑연)의 경우, VOCs를 흡착하는 기본 적인 특성을 갖고 있어 지지체로서 유리한 측면이 있다. 이러한 특성 때문에 금속산화물(Co₃O₄, CoO, CrO₃)을 카본물질에 담지시켜 제조한 촉매상에서 VOCs 촉매산화에 관한 연구가 보고되고 있다. 따라서, 본 연구에서는 methand과 acetaldehyde의 연소 활성이 우수한 Co-PC를 카본블랙에 담지한 촉매의 연소 특성에 관하여 연구하였다. 담지량 및 반응온도 등의 영향을 검토하였으며,Co-PC/C 촉매의 상대적 활성을 평가하기 위하여 상용의 RCO 촉매 활성과도 비교하였다. 물리화학적 특성조사로는 지지체에 대한 열적 안정성을 TGA(Thermogravimetric analyzer), 결정구조 분석은 XRD(X-ray Diffractometer)를 이용하여 조사하였다. 지지체인 카본블랙은 600t까지 안정하였으며, 유기용매에 대한 영향은 관찰되지 않았다. 공기로 전처리한 Co-PC/C 촉매중 Co는 Co₃O₄ 산화물형태로 존재하였으며, acetaldehyde 연소시 활성점으로 작용하는 것으로 판단된다.

석유화학 공단 주변 지역 SO_(2)의 계절별 변화 예측

서성규,이선원,이상득,박종혁 國立 麗水大學校 環境問題硏究所 1999 環境硏究論文集 Vol.2 No.-

This study focuses on the assessment of long-term So_(2) concentration around the Yochon industrial complex area using ISCLT model. ISCLT model has been officially authorized by the U.S. EPA. Yochon industrial complex was located around Kwang-yang bay. In order to simulate the prediction of long-term So_(2) concentration by ISCLT model and the application in Yochon industrial complex area, every point source was identified and applicability to this region was studied in detail. Long-term meteorological data were analyzed from 1995 to 1998. As the result of verification and calibration for the model accuracy. the conversion factor was 8.35. According to the analysis from 1995 to 1988 meteorological data in Yochon, west north west(WNW: 13), north east north(NEN: 1), and south(s: 8) direction were identified to be the most frequently occurred one whit its frequency. As the result of modeling prediction, SO_(2) concentration in Yochon petroleum industrial complex area was satisfied to Air Quality Standards.

Virtual Drop Test Methodology for a MEMS-based Sensor

서성규,오상우,한승오 대한금속·재료학회 2011 ELECTRONIC MATERIALS LETTERS Vol.7 No.2

Virtual drop test methodology based on a set of simulations is developed to evaluate the shock reliability of a MEMS (Micro Electro Mechanical System)-based sensor. The methodology consists of (1) FEM (Finite Element Method) analyses to extract the equivalent parameters of the packaged sensor, (2) a high-level simulation to determine the overall responses caused by an impact on a rigid concrete floor, and (3) another FEM simulation to evaluate whether or not the device withstands the shock by comparing the maximum stress level to the yield strengths of the materials that comprise the device. The proposed methodology accounts for the dynamic shock response as well as the stress distribution in the microstructure encapsulated by the package and thus provide insight into methods of improving the design of the device. Hence, it is expected that the proposed methodology will contribute to the effective development of robust MEMS-based sensors and their successful commercialization.

자동차 폐촉매를 이용한 VOCs 연소 활성 ( VOCs Combustion Activity of Waste Automotive Catalyst )

서성규,문정선 한국대기환경학회 2000 한국대기환경학회 학술대회논문집 Vol.- No.-

Metal separator의 자력개선과 자동차 연구

서성규,황원준,양병곤 여수대학교 산업기술지역개발연구소 2001 産業基術硏究所 論文集 Vol.10 No.-

The metal separators which are used at chemical plants and/or plastic powder manufacturing plants are to improve the productivity and reduce the inferiority of the materials and protect the machines so as to prevent the malfunction of the machines. The metal separators are divided according to the collecting methods as permanent magnet, electro magnet, supersonic waves and each method has advantages and disadvantages. The extensively spread metal separator is magnet type which has relatively low collecting ratio to 91%, but the facility cost is cheap and almost no annual operation cost with long average life span. The magnetic force intensity of the magnet bar surface can improve the efficiency of alien substance remove. The extensively used current permanent magnet type has the maximum 4000 gauss of surface magnetic force intensity. Recently a local company developed a maximum 8500 gauss of surface magnetic force intensity and supply to the local market with equal capacity to the imported one. But, the alien substance collected on the permanent magnet bar may be removed manually and it is required of magnetic force improvement and automation for process and economical efficiency. Therefore, the object of this research is to develop the magnetic force improved magnetic bar and automatic device for the collected alien substance removal, so improve the collecting ratio and the efficiency of the production process. We tested the optimized conditions by measuring the magnetic force of the permanent magnet bar according to the magnet location and size. As a result of this research, we developed a magnet bar with surface magnetic force intensity with maximum 8500 gauss. Also, we tried to check the possibility of the automation by testing of surface resin coating method for automation device development, researching the collecting capacity of alien substance and designing the stabilization of machine process structure.

Characteristics of Odor in the Major Facilities of a Fishery Industrial Complex

서성규,마충곤,전준민 한국냄새환경학회 2009 실내환경 및 냄새 학회지 Vol.8 No.2

The objectives of this study were to analyze the characteristics of odor in the major facilities of a fishery industrial complex using the air dilution olfactory method and the instrumental analysis method. The results indicate that although the limit of dilution to threshold (D/T) ratio in the major facilities is not regulated by the Odor Emission Standard, the mean (D/T) ratio over than 3,000 which is higher than the limit in the outlet of industrial area 3 times was found at three sampling sites. In the case of the concentration of the malodorous compounds, ammonia concentration is higher than any other odor compounds. The methyl mercaptan, n-Butyric acid and hydrogen sulfide as the main pollutants are confirmed by the odor quotient (OQ). In our study, it is showed a moderately good correlation between the (D/T) ratio and the sum of OQ. By this result, we can estimate the odor characteristics and evaluate the potential impact of each odor compound. In addition, we consider that it will affect the people's normal life and even cause for complaint around the boundary area by the diffusion of odor.

물 지붕, 물 스크린을 이용한 안개저감 실험

서성규,배진영,정재원,이철규,이정호,김유철,장기호,최영진 한국기상학회 2010 한국기상학회 학술대회 논문집 Vol.2010 No.10

저장탱크에서 방출되는 유증기의 회수 특성

서성규,여은주 한국대기환경학회 2010 한국대기환경학회 학술대회논문집 Vol.2010 No.10월