• Title/Summary/Keyword: chemical analysis

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Electronic Structure and Photoreactivity of N-Methyllutione (N-메틸루티돈의 電子構造와 光化學反應性에 關한 硏究)

  • Shim Sang Chul;Hyun Myung Ho;Chae Kyu Ho
    • Journal of the Korean Chemical Society
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    • v.21 no.6
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    • pp.434-439
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    • 1977

  • The electronic structures of 4-pyridone and lutidone are studied by the SCF MO-CI PPP method and by the configuration analysis method. The spectral data are consistent with the values calculated by the method. The polarization of $S_1({\pi},{\pi}^*)$ state is along the long molecular axis in both compounds. The lowest $({\pi},{\pi}^*)$1 state shows significant charge transfer (16∼18%) from ${\pi}$ bonding orbital of C=O moiety to ${\pi}^*$ antibonding orbital of divinyl amine moiety. The lowest triplet state shows much larger charge transfer (24∼29 %) but in opposite direction compared to that of $S_1({\pi},{\pi}^*)$ state.

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Estimation of Heat Transfer Characteristics for a Solar Chemical Reactor (고온 태양열 화학반응기 열전달 성능 평가)

  • Kang, Kyung-Mun;Lee, Ju-Han;Cho, Hyun-Suk;Seo, Tae-Beom
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.2221-2226
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    • 2008

  • The objective of this paper is to describe the experimental and numerical investigation of the analysis of the heat transfer in a solar chemical reactor. These are compared about methane steam reforming process in the solar chemical reactor which was a volumetric absorber consisting of honeycomb and a multilayered catalyst supports. With this high operating temperature, convective heat loss, thermal fracture are important features for designing SCR. In order to estimate the system performance and to design the actual solar reactor with various conditions, CFD analysis was used in this study. The nickel oxide porous metal is inserted inside the solar chemical reactor to increase the conversion rate of the reforming reaction. Simulation has been carried out based on the experimental data. According to the simulation results, the optimum methane-steam mole ratio and thickness and numbers of catalyst supports were obtained.

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