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This is a Experimental Study study.

Exploring the Emission Spectrum of Pure Hydrogen Combustion in Spark Ignition Engines: A Comprehensive Experimental Study

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Averaged CO2 and HC emissions were less than 0.02% at mid-load, indicating low carbon output.
Cycle peak values showed spikes under 100 ppm, linked to PM emissions and lubricant induction.
The experimental analysis utilized direct hydrogen injection in a single-cylinder spark ignition engine.
Findings point to significant water vapor emissions at lambda 1, supporting potential for EGR and water injection.

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Experimental study reveals low carbon emissions and water vapor potential in hydrogen engines, suggesting viability for zero-carbon targets.

Mohamed et al. (2025) studied this question.

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Experimental study reveals low carbon emissions and water vapor potential in hydrogen engines, suggesting viability for zero-carbon targets.