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Ce_(0.8)Zr_(0.2)O₂ 촉매를 이용한 Dimethyl Carbonate 합성에서 탈수제 첨가의 영향
한기보,전진혁,박노국,이종대,류시옥,이태진,이병권,안병성 한국공업화학회 2004 응용화학 Vol.8 No.1
The effect of dehydrating agent in DMC(dimethyl carbonate) synthesis from methanol and carbon dioxide over Ce_(0.8)Zr_(0.2)O₂ catalyst was studied in this work. Ce_(0.8)Zr_(0.2)O₂ catalyst having the best activity among Ce_(1-x)Zr_(x)O₂ catalysts was selected. We could supposed that the addition of dehydrating agents improved the DMC yield by H₂O elimination. When the dehydrating agents such as Na_(2)SO₄ or K₂SO₄ was added into the synthesis of DMC, the formation amount of DMC increased to about 0.8∼0.9 mmol through the elimination of formed H₂O as by-product.
계통연계형 태양광발전시스템을 위한 단독운전 검출에 관한 연구
이기제(Gi-Je Lee),김민(Min Kim),이진섭(Jin-Seop Lee),유권종(Gwon-Jong Yu) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
The general ways of the anti-islanding can be classified into the active method and passive method. The passive method which use only the voltage information when power failure occurs has much possibility of the wrong detection. And the active method detects the change of the voltage frequency as instantaneously changing the frequency of the inverter output current.<br/> Therefore, in this paper, the method to inject arbitrary order harmonics into controlled current is proposed. In this method islanding can be detected by measuring the amount of load voltage of injected harmonics order. And as a current control method predictive control method is used, which make actual current accurately to track reference current by instantaneously computing converter output voltage and has fast response in transient state This parer proposed method was verified by simulation.