NOVELTY - Removing (M1) sulfur-containing compounds from fluid fuel streams involves contacting the gaseous fuel stream with at least one catalyst containing at least one substrate and at least one reactive metal salt to convert the sulfur-containing compounds to elemental sulfur.    USE - For removing sulfur-containing compounds e.g. hydrogen sulfide (H2S), carbon disulfide (CS2), mercaptans, thiols, carbonyl sulfide (COS) from fluid fuel streams (preferably gaseous fuel streams having high sulfur content selected from land fill gases, natural gas from natural gas wells, flammable gases from oil wells, flammable gases from tar sands, syngas, and flare gas (methane)) (claimed).    ADVANTAGE - The catalysts for oxidative sulfur removal can treat high sulfur content-containing fuel streams and have high contaminant tolerance. The catalysts can be used to oxidatively remove sulfur-containing compounds from fuel streams, preferably gaseous fuel streams having high sulfur content. Due to the reduced catalyst cost, anticipated long catalyst life and reduced adsorbent consumption, the catalysts provide a 20-60% reduction in annual desulfurization cost for biogas with sulfur contents ranges from 1000-5000 parts per million by volume (ppmv) compared with the best adsorbent approach. The sulfur content of the fluid fuel source, after contact with the catalyst and removal of the elemental sulfur, is reduced by at least 5% (preferably 95%, especially 99%) compared to the inlet sulfur content before contact with the catalyst over a period of at least 1 (preferably 15, especially 30) days. Less than 5% (preferably 0.3%, especially 0.2%, particularly 0.1%) of the sulfur species are converted to SO2. The catalyst has a single pass conversion of 80-99% (preferably 85-99%), at 200 degrees C and an oxygen to sulfur atomic ratio of 1.2-4.0. The catalyst has a conversion rate of at least 80% at a gas hourly space velocity (GHSV) of 500-15000 per hour or a resident time of 0.24-7.2 seconds. The catalyst results in efficient sulfur conversion even with significant temperature variations with little or no production of sulfur dioxide (SO2); and exhibit a sulfur conversion rate of 0.83-0.95 over oxygen to sulfur atomic ratio (O/S ratio) of 1.2-2.4. The catalyst has a very high selectivity to elemental sulfur formation and that SO2 formation is negligible making these catalysts excellent candidates. The oxidative sulfur removal (OSR) catalysts typically convert 85-95% of sulfur species in gaseous fuel streams, such as biogas, to elemental sulfur. The catalysts improve catalyst life for desulfurization of high sulfur containing gaseous fuel streams. The catalysts are thermodynamically and chemically stable in the presence of contaminants such as carbon dioxide (CO2), ammonia (NH3), halogenated compounds and the process temperatures.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an oxidative sulfur removal catalyst comprising at least one substrate and at least one reactive metal salt, where the reactive metal salts are supported on the substrate, and a) the sulfur content of a fluid fuel source containing at least one sulfur-containing compound, after contact with the catalyst to convert the sulfur-containing compounds to elemental sulfur and removal of the elemental sulfur, is reduced by at least 5% (preferably 95%, especially 99%) compared to the inlet sulfur content before contact with the catalyst over a period of at least 1 (preferably 15, especially 30) days; b) less than 5% (preferably 0.6%, especially 0.1%) of the sulfur containing compounds are converted to sulfur dioxide (SO2); c) the catalyst has a single pass conversion of 80-99% (preferably 85-99%), at 200 degrees C and an oxygen to sulfur atomic ratio of 1.2-4.0; and d) the catalyst has a conversion rate of at least 80% at a gas hourly space velocity (GHSV) of 500-15000 per hour or a resident time of 0.24-7.2 seconds.