An exhaust gas purifying system for an automotive internal combustion engine includes a NOx treating catalyst for reducing NOx disposed in an exhaust gas passageway of a combustion device, to reduce NOx in presence of reducing components in exhaust gas. Additionally, a hydrogen enriching device is disposed...http://www.google.com/patents/US6823662?utm_source=gb-gplus-sharePatent US6823662 - Exhaust gas purifying system
