Cerium containing nanoparticles prepared in non-polar solvent

摘要

A method of making cerium-containing metal oxide nanoparticles in non-polar solvent eliminates the need for solvent shifting steps. The direct synthesis method involves: (a) forming a reaction mixture of a source of cerous ion and a carboxylic acid, and optionally, a hydrocarbon solvent; and optionally further comprises a non-cerous metal ion; (b) heating the reaction mixture to oxidize cerous ion to ceric ion; and (c) recovering a nanoparticle of either cerium oxide or a mixed metal oxide comprising cerium. The cerium-containing oxide nanoparticles thus obtained have cubic fluorite crystal structure and a geometric diameter in the range of about 1 nanometer to about 20 nanometers. Dispersions of cerium-containing oxide nanoparticles prepared by this method can be used as a component of a fuel or lubricant additive.

主权项

1. A method of making a cerium-containing metal oxide nanoparticle, comprising:
a) forming a reaction mixture of a source of cerous ion and a solvent, and optionally further comprising a non-cerous metal ion, wherein the solvent consists essentially of: (1) a carboxylic acid, wherein said carboxylic acid is a C3-C22 paraffinic carboxylic acid, a monoether carboxylic acid, a polyether carboxylic acid, or a mixture thereof, and (2) an optional hydrocarbon; and b) heating the reaction mixture to form a product dispersion containing cerium-containing metal oxide nanoparticles and less than about 0.5 wt. % water.