e-Fuels: climate friendly energy that can put us in the driving seat to a sustainable future

Significance of the topic

Greenhouse gas reduction targets and the drive to decarbonize transport and industry make renewable liquid and gaseous fuels (e-fuels) central to energy transition strategies. E‑fuels produced from green hydrogen and atmospheric or point‑source CO2 enable drop‑in fuels for aviation, shipping and road transport while enabling grid and seasonal energy storage. Robust, rapid analytical monitoring of intermediate and product gas streams is essential to optimize electrolysis, CO2 conversion, syngas synthesis and downstream catalytic processes such as Fischer–Tropsch and methanation. This application note demonstrates the role of scanning magnetic sector mass spectrometry (MS) as a process analytical tool for e‑fuel production development and control.

Objectives and overview of the application note

The document aims to: (1) frame e‑fuels production pathways and their relevance to climate goals, (2) describe key process stages (green hydrogen, syngas generation, methanation, Fischer–Tropsch and SAF production), and (3) present analytical performance data for Thermo Fisher Scientific Prima PRO / Prima BT scanning magnetic sector MS applied to fuel gas and syngas streams. The note provides experimental validation (linearity, precision, long‑term stability) and case examples from electrolyzer development and large‑scale oxygen streams.

Methodology and analytical approach

The analytical approach centers on process mass spectrometry using a scanning magnetic sector analyzer. Key methodological points:

• Electron‑impact ionization of neutral gas species, mass separation in a magnetic field and Faraday detection of ion currents provide high linearity and rapid multi‑component quantification.
• Scanning magnetic sector MS produces flat‑top peaks that are tolerant to small mass position drift, improving stability and quantitation compared with Gaussian peaks in quadrupole systems.
• Performance tests included calibration with an ISO 17025 accredited multi‑component gas cylinder, preparation of eight mixed fuel gas matrices spanning wide concentration ranges, and repeated cycle analysis (10 s cycle time, 30 cycles over 5 min) to assess repeatability and linearity.
• Applications demonstrated span electrolyzer development (mixed H2/O2 streams, water vapor monitoring), syngas and Fischer–Tropsch gas‑to‑liquids monitoring, and full‑scale plant oxygen purity measurement.

Used instrumentation

• Thermo Scientific Prima PRO 710 Process Mass Spectrometer (scanning magnetic sector)
• Thermo Scientific Prima BT Bench Top Process Mass Spectrometer
• ISO 17025 accredited multi‑component gas calibration cylinder used for relative sensitivity calibration

Notes: instruments are available for Zone 1 and Class 1 Div 2 hazardous area installations; magnetic sector analyzers include cold‑cathode vacuum gauge, Faraday detector and turbomolecular pumping components as part of the system design.

Main results and discussion

• Linearity: Coefficients of determination (R2) measured during independent ISO17025 testing were excellent across fuel gas species: H2, CH4, C2H4, C2H6, C3H6 R2 = 1.0000; C3H8 R2 = 0.9999; CO2 R2 = 0.9995; CO and N2 R2 = 0.9994. This demonstrates near‑ideal linear response across wide concentration ranges.
• Precision: The Prima PRO achieves very low absolute precision values for typical syngas and product streams. Representative performance from the application note shows absolute precision on the order of 0.002–0.05 vol% for light hydrocarbons and permanent gases depending on concentration, and sub‑0.1% relative standard deviations on certified cylinder checks.
• Stability: A field unit ran eight months without recalibration and, when tested across 11 consecutive analyses of a 16‑component certified cylinder, remained within specification. Cylinder check statistics presented indicate mean values closely matching certified concentrations with very low %RSD (e.g., methane %RSD ~0.016, hydrogen %RSD ~0.046), supporting long‑term drift resistance.
• Speed and diagnostics: The instrument enabled 10‑second cycle analyses, allowing near‑real‑time process visibility. Case studies include detection of incomplete H2/O2 separation in a development electrolyzer (enabling rapid fault diagnosis) and monitoring H2O ppm in an oxygen product stream to track dryer performance and oxygen purity improvements.
• Analytical suitability: The combination of multi‑component capability, high linearity, precision, rapid cycle time and robustness under process conditions makes magnetic sector MS particularly suitable for syngas composition control, methanation/Sabatier reaction monitoring, Fischer–Tropsch synthesis gas feeds, SAF production lines and electrolyzer R&D and QA/QC.

Benefits and practical applications of the method

• Process control: Real‑time composition data enable tighter control of stoichiometry, catalyst feed conditions and safety interlocks (e.g., H2/O2 mixtures).
• R&D acceleration: Rapid diagnostics shorten development cycles for electrolyzers, CO2‑to‑fuel reactors and catalysis optimization.
• Quality assurance: High precision and long calibration intervals reduce operational downtime and ensure product specifications for SAF and other synthetic fuels.
• Flexibility: Single analyzer can quantify multiple gaseous species (H2, CO, CO2, CH4, C2–C6 hydrocarbons, N2, Ar, H2O ppm), reducing the need for multiple dedicated sensors.

Future trends and opportunities

• Expanded on‑line analytics: Integration of process MS with advanced process control and digital twins will enable predictive adjustments and tighter energy/material efficiency for e‑fuel production.
• Decentralized and modular plants: Compact, robust MS systems support distributed e‑fuel facilities, micro‑GTL (gas‑to‑liquids) and electrolyzer clusters providing local fuel production and grid services.
• Hybrid sensor arrays: Combining magnetic sector MS with spectroscopic sensors (TCD, NDIR, tunable laser) and chemometrics may further improve multi‑parameter monitoring (e.g., trace oxygen, moisture, trace organics) and fault detection.
• Regulatory and certification support: Reliable online analytics will be central to proving lifecycle carbon neutrality and qualifying SAF and other e‑fuels for regulatory incentives and aviation standards.

Conclusion

Scanning magnetic sector mass spectrometry, as exemplified by the Prima PRO and Prima BT instruments, offers high linearity, excellent precision, rapid multi‑component analysis and long‑term stability—qualities that match the demanding analytical needs of e‑fuel production and development. The technology supports electrolyzer R&D, syngas monitoring, methanation and Fischer–Tropsch workflows, and contributes directly to process optimization, product quality assurance and accelerated time to market for sustainable fuels.

References

1. World Meteorological Organization press release on recent global temperature records, 2023.
2. United Nations news release quoting António Guterres on climate risks and COP28 outcomes, 2023.
3. Evans S. Improving production of green hydrogen with fast, precise gas analysis mass spectrometry. Thermo Fisher Scientific, 2022.
4. Nature commentary on CO2 reduction and electrochemical processes, 2022.
5. Imperial College London report on the first transatlantic flight powered by 100% sustainable aviation fuel (Flight 100).
6. NOAA research summary on aviation contributions to radiative forcing and climate impacts.
7. Johnson Matthey technical information on Fischer–Tropsch catalysts and GTL technologies.
8. European Parliament press release on EU targets for sustainable aviation fuel share by 2050.
9. Aviation Industry news on hydrogen and SAF pathways in aviation.
10. Repsol project documentation describing pilot synthetic fuels plant and SAF production.
11. Johnson Matthey / collaborators announcements regarding FT catalyst supply and partnerships for synthetic fuels.