The Development of an Accurate Quantitative Measurement Method of Isocyanic Acid for Investigation of Urea Decomposition Process

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  • 尿素分解過程の解明に向けたイソシアン酸の高精度計測法の開発
  • ニョウソ ブンカイ カテイ ノ カイメイ ニ ムケタ イソシアンサン ノ コウセイド ケイソクホウ ノ カイハツ

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In order to elucidate the urea decomposition process for constructing the SCR catalyst model, an accurate quantitative measurement method for isocyanic acid, which is an intermediate product of urea, is required. In this study, the development of standard gas generation method of isocyanic acid and the measurement of isocyanic acid with Fourier Transform Infrared Spectrometer（FT-IR）in synthetic exhaust gases consisting of CO, CO2, NO, NO2, NH3, N2O, and H2O, were carried out. As a result, it is possible to measure the HNCO concentration up to 150 ppm by FT-IR. The measurement accuracy (defined as twice the standard deviation) was obtained to be ± 2.0 to 2.9 ppm.

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