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Method for Preparing Nanometer Cerium-Based Oxide Particles

Detailed Technology Description

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Supplementary Information

Patent Number: US7025943B2
Application Number: US2002146824A
Inventor: Zhou, Xiao Dong | Huebner, Wayne | Anderson, Harlan U.
Priority Date: 15 May 2002
Priority Number: US7025943B2
Application Date: 15 May 2002
Publication Date: 11 Apr 2006
IPC Current: C01F001700
US Class: 423263 | 4230211
Assignee Applicant: The Curators of the University of Missourilumbia
Title: Method for preparation of nanometer cerium-based oxide particles
Usefulness: Method for preparation of nanometer cerium-based oxide particles
Summary: For producing cerium dioxide crystals, used as fast ion conductors, oxygen storage capacitors, catalysts, e.g. three-way catalysts for the purification of exhaust gases from cars, UV blockers and polishing materials.
Novelty: Production of cerium dioxide crystals comprises providing first solution of water-soluble cerium salt solution, and providing second aqueous solution of alkali metal or ammonium hydroxide

Industry

Chemical/Material

Sub Category

Chemical/Material Application

Others

*Abstract

Abstract of US Patent 7,025,943 - Method for Preparation of Nanometer Cerium-based Oxide Particles: The invention comprises novel undoped and doped nanometer-scale CeO2 particles as well as a novel semi-batch reactor method for directly synthesizing the novel particles at room temperature. The powders exhibited a surface area of approximately 170 m2/g with a particle size of about 3-5 nm, and are formed of single crystal particles that are of uniform size and shape. The particle's surface area could be decreased down to 5 m2/g, which corresponds to a particle size of 100 nm, by thermal annealing at temperatures up to 1000°C. Control over the particle size, size distribution and state of agglomeration could be achieved through variation of the mixing conditions such as the feeding method, stirrer rate, amount of oxygen gas that is bubbled through the reactor, the temperature the reaction is carried out at, as well as heating the final product at temperatures ranging from 150°C to 1000°C.Non-confidential Abstract of Invention: A semi-batch reactor method was developed for directly synthesizing undoped and doped, nanometer-scale CeO2 particles at room temperature. Powders exhibited a surface area of ~ 170 m2/g (particle size ~ 3-5 nm), and could be decreased to 5 m2/g by thermal annealing at 1000°C. Control over the particle size, size distribution and state of agglomeration could be achieved through variation of the mixing conditions, and oxidation pathway.

*Principal Investigator

Name: Xiao-Dong Zhou, Research Scientist

Department:

Name: Wayne Huebner, Department Chairman and Professor of Ceramic Engineering

Department:

Name: Harlan Anderson, Curator's Professor Emeritus of Ceramic Engineering

Department:

Country/Region

USA