Cleaner Engines with Ru–Pd Catalysts for Simultaneous Removal of Methane and Soot

1. Executive Summary

The global push toward cleaner transportation requires technologies that can simultaneously reduce multiple pollutants emitted by modern engines. This research introduces a novel catalyst system based on ruthenium (Ru) and palladium (Pd) atoms distributed on a porous cerium-zirconium oxide support. Unlike conventional catalytic converters that address pollutants separately, the Ru–Pd catalyst enables the oxidation of both methane and soot at lower temperatures, achieving higher efficiency and reducing fuel penalties. Methane is particularly difficult to oxidize due to its chemical stability, while soot requires activation through nitrogen oxides. By combining Ru and Pd, the catalyst leverages their complementary properties: Ru promotes NO oxidation to trigger soot burning, while Pd enhances methane activation. Laboratory testing demonstrated superior performance compared to standard catalysts, showing efficient removal of particulates and methane under realistic exhaust conditions. For industries, this represents a critical advance in meeting increasingly strict emission standards for dual-fuel and natural-gas-powered vehicles. For investors, it highlights a pathway to cleaner mobility technologies that reduce regulatory risks and support the energy transition.