Abstract
Cryogenic gas chromatography (GC) combined with isotope labeling was applied to discriminative determination of hydrogen gas formed through consecutive CO 2 reforming of methane and water–gas shift reaction. First, hydrogen gas was obtained by using a tandem reaction system, where reforming and shift reaction occurred consecutively. Here, D 2O instead of H 2O was used for shift reaction to label hydrogen gas generated there. Then, the resulting hydrogen isotopes were analyzed by a cryogenic GC system, in which an oven temperature was maintained at −196 °C by immersing a separation column into liquid nitrogen. On the chromatograms, the peaks of H 2 and D 2 generated from reforming and shift reaction, respectively, were clearly observed as well-separated peaks. Based on their peak intensities, hydrogen gas formed through the tandem reaction system was precisely determined with differentiating its sources.
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