August 14, 2025EnergiesOpen Access

Simultaneous Reductions in NOx Emissions, Combustion Instability, and Efficiency Loss in a Lean-Burn CHP Engine via Hydrogen-Enriched Natural Gas

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Nitrogen oxide emissions dropped by up to 70% with hydrogen-enriched gas, improving overall engine performance significantly.
Thermal efficiency increased by 2.2 percentage points in a lean-burn engine without hardware changes or timing adjustments.
Experiments on a six-cylinder engine revealed a λ window enabling simultaneous optimization of key metrics.
Findings indicate hydrogen as a viable option for enhancing natural gas engines in stationary applications.

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Experiments improved NOx emissions and combustion stability in lean-burn engines, suggesting hydrogen can optimize performance.

Fichtner et al. (2025) studied this question.

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