Advanced Hydrogen/Methane Utilization Technology Demonstration: Final Report

    Research output: NRELTechnical Report


    The overall objective of the work was to seek homogeneous blend ratios of hydrogen:methane that provide 'leverage' with respect to exhaust emissions or engine performance. The leverage sought was a reduction in exhaust emissions or improved efficiency in proportions greater than the percentage of hydrogen energy in the blended fuel gas mixture. The scope of the study included the range ofair/fuel mixtures from the lean limit to slightly richer than stoichiometric. This encompasses two important modes of engine operation for emissions control; lean burn pre-catalyst (some natural gas engines have no catalyst) and post-catalyst; and stoichiometric with three-way catalyst. The report includes a brief discussion of each of these modes.
    Original languageAmerican English
    Number of pages73
    StatePublished - 1994

    Bibliographical note

    Work performed by Hydrogen Consultants, Inc. (HCI), Littleton, Colorado

    NREL Publication Number

    • NREL/TP-425-6357


    • engine performance
    • exhaust emissions
    • hydrogen/methane blends


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