A method for reducing hydrogen sulfide emissions from heavy fuel oil or an asphalt composition comprising admixing an additive with heavy fuel oil or an asphalt composition wherein the additive comprises a solvent and nano-particles of a molybdenum component selected from the group consisting of Mo boroacylate, Mo carboxylate, Mo oxide, and combinations thereof; and wherein all of the nano-particles are from about 5 to about 300 nm; wherein the molybdenum component of the additive is present at from about 1 to about 50 molar % and is substantially as effective as reducing hydrogen sulfide as an additive containing Zn exclusively; wherein the solvent is selected from the group consisting of alcohols, polyethers, and combinations thereof; and wherein the additive is present at a concentration sufficient to introduce from about 20 to about 2500 ppm by weight metal oxide, sulfide, boroacylate, or carbonate into the asphalt or fuel oil.
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