首页|Application of chromium catalysis technology to compound-specific hydrogen isotope analysis of natural gas samples
Application of chromium catalysis technology to compound-specific hydrogen isotope analysis of natural gas samples
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NSTL
Elsevier
An easy-to-use and efficient approach for the catalytic pyrolysis of hydrocarbon gas here is proposed and tested, which allowed the precise measurement of delta H-2. This method requires the reaction tube filled with twisted chromium wire, establishing a gas chromatography-Chromium wire/high temperature conversion-isotope ratio mass spectrometer (GC-Cr/HTC-IRMS) system. The approach described here has many remarkable advantages over other techniques. In comparison to traditional carbon-coating pyrolysis technique, this proposed method greatly reduces the pyrolysis temperature of the hydrocarbon gas, especially methane, with temperatures reduced from 1450 to 1250 degrees C, while still ensuring excellent analytical precision. Therefore, hydrogen isotope analysis of natural gas can be carried out at a lower cracking temperature for a longer time, with the advantage of increasing the service life of the HTC furnace. Meanwhile, no pretreatment or activation is required while putting the Cr/HTC system to use. Further, the accuracy of delta H-2 values obtained using this new method is better than using the traditional method. Our experiments demonstrate that the test errors of this novel method and the conventional method are within +/- 5.5 parts per thousand and +/- 6.5 parts per thousand, respectively.
NSTL
Elsevier
