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임성광(Lim, Sung-Kwang),배중면(Bae, Joong-Myeon),김기현(Kim, Ki-Hyun) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Water gas shift(WGS) is an important step in fuel process for fuel cells, and improperness of commercial WGS catalysts for use in fuel cell systems has prompted numerous researches on noble metal catalysts. A selected noble metal catalyst for water gas shift reaction(WGS) was prepared with various metal loadings. The prepared catalysts were tested under two feeding conditions. At moderate residence time, carbon monoxide conversion was much higher on the noble metal catalysts as compared to commercial high-temperature shift catalyst. Effects of metal loading were examined by activity tests at short residence time. Higher metal loading effected higher reaction rate. The kinetic data was fitted to simple reaction equations and effectiveness factor was estimated. The results suggest the necessity of a structural design for the highly active noble metal catalysts.
임성광(Sungkwang Lim),배중면(Joongmyeon Bae),강인용(Inyong Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Structural simplicity is one of the advantages of an autothermal reforming(ATR) reactor. ATR reactor needs no heat-supplying devices such as burners and heat exchanger. The heat balance in an ATR reactor is dependent on operation parameters and they should be carefully determined for reactor stability and high efficiency. To study operation conditions of an ATR reactor, a packed-bed ATR reactor with a commercial catalyst was designed and constructed. Operation parameters such as O₂/C, H₂O/C and GHSV (gas hourly space velocity, /h) were varied and the resultant behavior of the reactor was characterized by analyzing product compositions and monitoring temperatures at various points inside the reactor during operations. Effects of operation parameters on the product compositions in the experiment were different from those predicted by thermodynamic calculations. The difference can be attributed to dependence of the temperature on operation parameters in the real reactor which the thermodynamic calculation does not take into account.
임성광(Sungkwang Lim),배중면(Joongmyeon Bae),김선영(Sunyoung Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Water gas shift reactor in fuel processing is an important part that converts carbon monoxide into hydrogen. Fuel processing system for PEMFC usually has two stages of WGS reactors, which are high temperature and low temperature shifter. In this study we prepared noble metal catalysts and compared their performances with that of a commercial iron chromium oxide catalyst. Noble metal catalysts and the commercial catalyst showed quite different temperature dependence of carbon monoxide conversion. The conversion of carbon monoxide at the commercial catalyst was very low at medium temperature(~300℃) and increased rapidly as temperature increased while the conversion at noble metal catalysts was high in the medium temperature range and decreased as temperature increased, which is thermodynamically expected. Their characteristics agreed well with the literature published, and we are accomplishing further study for improvement of the noble metal catalysts.
수증기 개질 반응기 내의 열 및 물질전달 특성에 관한 연구
이신구(Lee, Shin-Ku),임성광(Lim, Sung-Kwang),배중면(Bae, Joong-Myeon) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
In this paper, heat and mass transfer characteristics through experimental and numerical study are extensively investigated in steam reform ins reactor under given operating conditions. In order to get simulated data at outlet of the reformer, heterogeneous reactor model is incorporated. As the reaction also takes place in porous media, two medium approach is used to take into account thermally non-equilibrium phenomena between catalyst and bulk gas. In steam reforming reaction, heat transfer issue is so significant that geometrical configuration study is also conducted.