Benefits and Considerations of Converting to Hydrogen Carrier Gas

Significance of the Topic

Hydrogen offers an abundant, low-cost alternative to diminishing helium supplies in gas chromatography with the potential to sustain laboratory operations and reduce analytical costs

Objectives and Study Overview

This article evaluates safety considerations, chromatographic performance, and practical conversion strategies for replacing helium with hydrogen as a GC carrier gas

Methodology

Van Deemter plots were used to compare optimal linear velocities for helium, nitrogen, and hydrogen
Practical separations of a hydrocarbon mixture were performed under both carrier gases, doubling linear velocity for hydrogen to assess impact on resolution and run time

Used Instrumentation

• Gas chromatograph with electronic pressure regulation injector
• On-demand hydrogen generator equipped with leak detection and automatic shutoff
• Fused silica and Siltek-treated metal capillary columns (MXT®, Rt®-Alumina BOND/MAPD)
• Flame ionization detector (FID)

Main Findings and Discussion

Hydrogen generators store minimal gas volume at low pressure (<60 mL at 7 atm), greatly reducing the safety risk compared with high-pressure cylinders
Flow-controlled operation limits hydrogen release and prevents excessive pressure build-up; integrated sensors enable automatic shutoff in case of leaks
Van Deemter analysis shows hydrogen achieves plate heights comparable to helium at twice the linear velocity (~40–45 cm/s), enabling up to 50 % reduction in analysis time
Hydrocarbon separations on hydrogen yielded twice the speed with only minor losses in efficiency and produced narrower, taller peaks that improve sensitivity and detection limits
Method adaptation for isothermal runs requires doubling linear velocity and halving injection volume; temperature-programmed methods demand adjusted oven ramp rates (approximately doubled) to maintain elution order

Benefits and Practical Applications

• Up to 2× faster analysis times and higher laboratory throughput
• Significant cost savings due to inexpensive, on-demand hydrogen generation
• Enhanced sensitivity from sharper peaks and reduced sample loading
• Lower maintenance requirements through reduced contamination and simpler gas handling

Future Trends and Potential Applications

Ongoing improvements in generator safety features and automation will simplify hydrogen integration
Software tools and AI-driven method conversion are expected to streamline temperature-program adjustments
Wider adoption in high-throughput, regulated environments as helium scarcity and cost pressures continue

Conclusion

Adopting hydrogen as a GC carrier gas offers a sustainable, cost-effective solution without sacrificing chromatographic performance when supported by proper safety measures and method adjustments

References

1. T. Newcomb, Time NewsFeed (August 23, 2012). There’s a helium shortage on and it’s affecting more than just balloons.