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Molecular hydrogen (H<sub>2</sub>) emissions and their isotopic signatures (H/D) from a motor vehicle: implications on atmospheric H<sub>2</sub>

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Table 1. Operating modes (OM) for the experiments conducted on a passenger car engine
Fig. 1. Engine exhaust concentrations for H 2 (a) and its isotope ratio δD (b), CO (c), and the ratio H 2 /CO (d) vs
Table 2. Temperatures, trace gas concentrations, and H 2 isotope ratio for pre-TWC (three-way catalytic converter) and post-TWC exhaust gasoline and from a methane-fuelled engine
Fig. 2. Temperature-dependence of δD of H 2 produced in motor ve- ve-hicle engine combustion
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