Passive Metal Hydride Module Concept for Enhanced Low-Temperature Catalyst Performance

A technology concept applicable to stoichiometric and lean burn engine operation-a metal hydride (MH_x) module for the generation of H₂ via reaction with gaseous H₂O-was evaluated for the introduction of low levels of H₂ (ca. 500 ppmv) into internal combustion engine exhaust for the enhancement of catalyst performance at low temperatures, such as during cold-start. Projected MH_x module packaging volume, replacement frequency, and costs over the lifetime of a light duty vehicle are excessive, and considered prohibitive to technology viability.