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With forthcoming 2014 EPA GHG legislation capping methane emissions at 0.10 g/bhp-hr for heavy-duty engines, development of a thermally stable and sulfur-tolerant methane oxidation catalyst becomes more critical. This is particularly true for natural gas-powered engines where methane slip is a significant contributor in the emissions and sulfur is present as a constituent of odorants used in CNG. Scientists at Clariant have recently developed a novel process for manufacturing a PGM containing zeolite that is both thermally stable and resistant to sulfur poisoning. Methane oxidation catalysts typically require temperatures in excess of 400°C to achieve light-off and are often sensitive to exposure to sulfur. The PGM zeolite catalyst has shown remarkable activity at low temperatures and a resistance to sulfur poisoning. Tests have shown that even after exposure to heavy concentrations of sulfur, the catalyst has little change in activity.