Hydrogen Analysis by Gas Chromatography-Mass Spectrometry

Area of Science:

• Analytical Chemistry
• Chemical Engineering

Background:

• Conventional hydrogen detection methods like gas chromatography with thermal conductivity detection (GC-TCD) and residual gas analyzers (RGAs) have limitations.
• GC-TCD shows poor response with helium carrier gas, and RGAs lack separation, causing interference and hindering accurate hydrogen quantification.
• Existing GC methods often require complex dual-column setups, limiting mass spectrometry (MS) compatibility.

Purpose of the Study:

• To develop and validate a robust gas chromatography-mass spectrometry (GC-MS) method for direct hydrogen detection and quantification.
• To overcome the limitations of conventional hydrogen analysis techniques.
• To enable simultaneous compositional profiling of complex gas mixtures.

Main Methods:

• Developed a novel GC-MS method utilizing a modified electron ionization (EI) source and a cryogenically cooled single capillary column.
• Employed helium as the carrier gas without dopants, reagent gases, or ion-molecule reaction schemes.
• Optimized method parameters including sample-loop volumes and split ratios for enhanced peak shape and signal-to-noise ratio.

Main Results:

• Achieved baseline separation of hydrogen from permanent gases and hydrocarbons in refinery gas mixtures.
• Demonstrated excellent linearity, high sensitivity, and exceptional reproducibility for hydrogen detection.
• Successfully quantified hydrogen at both trace and percent levels, alongside simultaneous analysis of other gas components.

Conclusions:

• The developed GC-MS method offers a robust and efficient solution for direct hydrogen detection and quantification.
• This technique overcomes significant limitations of traditional analytical approaches for hydrogen analysis.
• The method's versatility allows for comprehensive compositional analysis of complex gas mixtures in a single analytical run.