Patent ID: 6949235

Claim:
A process for reducing the level of pollutants in the exhaust of an engine, comprising: operating said engine using as the fuel a water fuel emulsion; the water fuel emulsion comprises water, fuel and an emulsifier, the emulsifier comprises: (i) at least one fuel-soluble product made by reacting at least one hydrocarbyl substituted carboxylic acid acylating agent with ammonia or an amine, the hydrocarbyl substituent of said acylating agent having about 50 to about 500 carbon atoms; (ii) at least one of an ionic or a nonionic compound having a hydrophilic-lipophilic balance of about 1 to about 40; iii) a mixture of (i) and (ii); (iv) an emulsion stabilizing amount of a water soluble compound selected from the group consisting of amine salts, ammonium salts, azide compounds, nitro compounds, alkali metal salts, alkaline earth metal salts, and mixtures of two or more thereof in combination with i), ii), or combinations; or v) combinations of i), ii) iii) and iv); and contacting the exhaust from the engine with an oxidation catalyst, the oxidation catalyst being in the form of a flow-through cellular monolith.