TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Feedstock: The hydrocarbon feedstock comprises a natural oil, synthetic oil, a distillate fuel e.g. naphtha, diesel fuel, fuel oil, kerosene or gasoline; a gaseous hydrocarbon dispersant in a liquid hydrocarbon; a hydrocarbon derived from a vegetable source or a mineral source e.g., corn, alfalfa, soybean, rapeseed, palm, shale, coal, tar sands, bitumen, residual oil, heavy oil or coke; or their combinations.Preferred Surfactants: The hydrocarbon-substituted carboxylic acid or reactive equivalent of surfactant (a) includes a monocarboxylic acid, a polycarboxylic acid, their anhydrides or combinations. It is preferably a hydrocarbon-substituted succinic acid or anhydride, and the amine used in making surfactant (a) is a monoamine, polyamine, hydroxyamine or mixture of these. Surfactant (a) comprises a mixture of at least two compounds, one of which is the reaction product of a hydrocarbon-substituted succinic acid or anhydride with ammonia, an amine, an alcohol or a mixture of at least two of these compounds, where the hydrocarbon substituent has 6-500C; and the other compound is different from the first and is the reaction product of a hydrocarbon-substituted succinic acid or anhydride with ammonia, an amine, an alcohol or their mixture, where the hydrocarbon substituent has 50-500C.The copolymer used in making surfactant (b) is derived from an olefin monomer of 2-30C. The alpha,beta-unsaturated carboxylic acid or derivative used in making the surfactant (b) is an anhydride, ester, amide, imide, salt, acyl halide, nitrile or mixture of at least two of these. The linking group in the surfactant is derived from a polyol, a polyamine, a hydroxyamine or a mixture of at least two of these.The surfactant (c) is an aromatic Mannich compound derived from a hydroxy aromatic compound of formula (R1)n-Ar(R)-(OH)m (I), an aldehyde or ketone of formula R1-C(=O)-R2 (II) or its precursor; and an amine containing at least one prim. or sec. amino group.Ar = aromatic group;m = 1-3;n = 1-4;R1 in formula (I) = up to 400C hydrocarbon group;R2 in formula (I) = H, amino or carboxyl;R1 in formula (II) = H or 1-18C hydrocarbon;R2 in formula (II) = H, 1-18C hydrocarbon or 1-18C carbonyl-containing hydrocarbon.The sum of m and n in formula (I) does not exceed the number of available positions on Ar that can be substituted.The surfactant (d) comprises an alkylaryl sulfonate, amine oxide, carboxylated alcohol ethoxylate, ethoxylated alcohol, ethoxylated phenol, ethoxylated amine, ethoxylated amide, ethoxylated fatty acid, ethoxylated fatty esters, ethoxylated fatty oil, fatty ester, glycerol ester, glycol ester, sorbitan ester, imidazoline derivative, lecithin, lecithin derivative, lignin, lignin derivative, monoglyceride, monoglyceride derivative, olefin sulfonate, phosphate ester, phosphate ester derivative, propoxylated fatty acid, ethoxylated fatty acid, propoxylated alcohol or alkyl phenol, ethoxylated alcohol or alkyl phenol, sorbitan derivative, sucrose derivative, sulfonate of dodecyl or tridecyl benzene, naphthalene sulfonate, petroleum sulfonate, tridecyl or dodecyl benzene sulfonic acid, sulfosuccinate, sulfosuccinate derivative, or mixture of at least two of these surfactants.Preferred Salt: The water-soluble salt comprises an amine or ammonium salt of formula (III).k(G(NR3)y)y+ nXp- (III)G = H or 1-8C organic group having a valence of y;R = H or 1-10C hydrocarbon;Xp- = is an anion having a valence of p;k, y, n and p = at least 1.Preferred Process: The water-blended hydrocarbon feedstock composition is steam reformed in the presence of steam reforming catalyst comprising nickel, cobalt, platinum, palladium, rhodium, iridium, osmium, ruthenium or a mixture of at least two of these elements. EXAMPLE - A water-in-oil emulsion was produced using 77 wt.% NATO F-76 marine diesel fuel, 3 wt.% chemical additive mixture and 20 wt.% deionized water. The chemical additive mixture comprised 40 wt.% ester/salt prepared by reacting polyisobutene (Mn=2000) substituted succinic anhydride with dimethylethanolamine at a molar ratio of 1:2, 19.8 wt.% succinimide derived from polyisobutene (Mn=1000) substituted succinic anhydride and ethylene polyamine mixture containing 15-25 wt.% diethylene triamine with the remainder being heavy polyamines having at least 7 nitrogen atoms per molecule and at least two prim. amines per molecule, 7.1 wt.% ester/salt made by reacting hexadecenyl succinic anhydride with dimethylethanolamine at a molar ratio of 1:1.35, 23.8 wt.% 2-ethylhexyl nitrate and 9.3 wt.% ammonium nitrate solution. The water-in-oil emulsion exhibited a continuous oil (or diesel fuel) phase, and a discontinuous aqueous phase which comprised aqueous droplets having a mean diameter of 0.6-0.8 mum. Using this emulsion at higher throughput condition (i.e. bed inlet, middle and outlet temperatures of 941, 956, and 936 degrees C, respectively), provided higher cold gas efficiency (88.9%), higher purity hydrogen, and lower methane slip as compared to pure diesel fuel.