US 8,801,811 B2 · Methods for stabilization and use of nanoparticle Fe6°

Abstract

A stabilized nano-Fe6-iron-crown ether complex is formed by preparing a solution of an iron salt and an oligomer crown compound in dialkylamine or diethylamine. Sodium tetrahydroboron (NaBH4) and dialkylamine or ethylendiamine are added at a temperature of 0-10° C. The mixture is heated to room temperature and boiled, thereby converting the formed iron (II)-borhydride complex (Fe(BH4)2) to a crown ether-iron-hydride complex [CWFe06].(2H)6. At higher temperature this last complex is converted to the Fe06-crown nanocomposite complex. The prepared nanoparticle Fe6° complex may be stabilized by inclusion into a cavity of a macrocyclic compound, and may be (1) added to diesel fuel to reduce NOx emissions upon combustion of that fuel; (2) added to lubricating oils as an anti-corrosion additive; and (3) used as an additive to secondary recovery processes within liquid hydrocarbon formations to increase the sweep efficiency and recovery factor of water-flooding operations.

Claims5

Dependent claims

A method of using a nanoparticle Fe06-crown ether complex as an additive, the complex being prepared by a method comprising the steps of:

preparing dialkylamine or ethylenediamine solutions of iron (II) complexes with olygomer crown ethers, containing two nitrogen atoms in a macrocyclic ring at a temperature;
adding a solution of sodium tetrahydroboron in ethylene diamine and mixing the result;
heating the resulting mixture and then boiling the mixture;
filtering the resulting mixture under a nitrogen atmosphere;
adding ethanol to the resulting mixture to reduce excess NaBH4, and continuing to boil the mixture until at least half of the ethylene diamine has been removed;
and
cooling the mixture to below 5° C. to precipitate a nanoparticle Fe06-crown ether complex CWFe6.

4 more elements

Dependencies are inferred from the claim text.

Methods for stabilization and use of nanoparticle Fe6°

Life of this patent

Methods for stabilization and use of nanoparticle Fe6°

Life of this patent

Abstract

Claims5