Colloidal dispersion of a rare earth compound comprising an anti-oxidant agent and use thereof as additive for diesel fuel for internal combustion engines
AssigneeRhodia Operations
InventorGilbert Blanchard
Life of this patent
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Abstract
The invention relates to a dispersion of the type comprising particles of a rare earth compound, particularly a compound of cerium, an acid and an organic phase, characterized in further comprising an anti-oxidant agent which can particularly be selected from substituted derivatives of phenol, aromatic amines or tocopherols. Said dispersion may be used as additive for diesel fuel for internal combustion engines, in particular as additive for diesel for diesel engines.
Claims18
A colloidal dispersion comprising particles of a rare earth compound, an acid, an organic phase, an antioxidant, and an element E;
- wherein at least 90% by weight of the particles are monocrystalline, wherein the rare earth compound is cerium and the element E is iron.
A colloidal dispersion comprising particles of a rare earth compound, an acid, an organic phase, an antioxidant, and an element E, wherein the particles are not larger than 200 nm, said dispersion having the following characteristics:
- said particles are in the form of aggregates of crystallites whose d80, advantageously d90, is not more than 5 nanometers, 90% (by weight) or more of the aggregates comprising 1 to 5 crystallites;
- and the acid is an amphiphilic acid comprising at least one acid with 11 to 50 carbon atoms, having at least one alpha, beta, gamma, or delta branch of the atom bearing the acidic hydrogen,
- wherein the rare earth compound is cerium and the element E is iron.
A fuel additive in the form of a colloidal dispersion, the colloidal dispersion comprising particles of a rare earth compound, an acid, an organic phase, an antioxidant, and an element E, wherein an atomic ratio of antioxidant to rare earth compound and the element E is 0.2 to 5.0 and wherein the rare earth compound is cerium and the element E is iron.
A method comprising:
- (a) providing a colloidal dispersion comprising particles of a rare earth compound, an acid, an organic phase, an antioxidant, and an element E, wherein at least 90% by weight of the particles of the rare earth compound are monocrystalline;
- and
- (b) combining the colloidal dispersion with a fuel for an internal combustion engine, thereby achieving enhanced stability of the particles of the rare earth compound in the fuel,
- wherein the rare earth compound is cerium and the element E is iron.
A method comprising:
- (a) providing a colloidal dispersion comprising particles of a rare earth compound, an acid, an organic phase, an antioxidant, and an element E, wherein the particles of the rare earth compound are not larger than 200 nm and are in the form of aggregates of crystallites whose d80, advantageously d90, is not more than 5 nanometers, 90% (by weight) or more of the aggregates comprising 1 to 5 crystallites, and the acid is an amphiphilic acid comprising at least one acid with 11 to 50 carbon atoms, having at least one alpha, beta, gamma, or delta branch of the atom bearing the acidic hydrogen;
- and
- (b) combining the colloidal dispersion with a fuel for an internal combustion engine, thereby achieving enhanced stability of the particles of the rare earth compound in the fuel,
- wherein the rare earth compound is cerium and the element E is iron.
Dependencies are inferred from the claim text.