Highly active precious metal catalysts, formulated for ambient temperature oxidation of unwanted contaminants in breathable gases. Specific uses include: conversions of carbon monoxide in breathing gas filters, removal of hydrogen within enclosed environments, abatement of volatile organic compounds (VOCs) and obtaining ultra high purity carrier gases for electronic component manufacture. Sofnocat 423 is available in a 1kg (2.2lbs) airtight polypropylene container