PEFTEC - Abstract

Abstract Information :

The use of hydrogen as a renewable energy source is seeing interest in many sectors including transportation, residential and industrial heating and cooling and for chemical storage of energy. Quality control of hydrogen, especially impurity analysis of different grades has become an urgent need for both hydrogen manufacturers and users.rnWe will examine the performance of an Agilent 8890 equipped with a purged valve box and PDHID and a 990 Micro GC for the analysis of H2 impurities. The system allows for the qualitative and quantitative detection of permanent gas impurities and carbon dioxide in a single injection. Argon and carbon dioxide can be effectively separated and accurately identified at 10s of ppb level without interference of H2 matrix due to a heart-cutting concept-based analysis approach. The design of helium purging chamber can protect the valves from the air leakage or diffusion and thus helped produce a stable baseline, which allows for the routine analysis of impurities at the ppb level. The system provides a reliable solution with detection limit less than 20ppb for 5 targeted impurities, excellent reproducibility showing peak height precision less than lt;5 for 50ppb standard gas and good linearity with R2 greater than 0.995 for each compound in the range of 50ppb-10ppm. These performances meet the analysis requirements of China GB T 3634.2-2011, GB T 37244-2018, ISO 14687-2019, and other standards on hydrogen quality control.rnAn Agilent 990 Micro GC configured with the micro thermal conductivity detector and two analytical channels shows the capability of a fast impurity analysis from 2 to 10,000 ppm in hydrogen within 150s. Helium, neon, argon, oxygen, nitrogen, methane and carbon monoxide can be well resolved on CP-Molesieve 5 channel, while methane and carbon dioxide are baseline separated on the Agilent CP-PoraPLOT U channel. All components show excellent retention time RSD less than 0.1 and area RSD less than 5.3. rnrn