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Title: Method for continuous synthesis of metal oxide powders

Abstract

A method for the rapid and continuous production of crystalline mixed-metal oxides from a precursor solution comprised of a polymerizing agent, chelated metal ions, and a solvent. The method discharges solution droplets of less than 500 .mu.m diameter using an atomizing or spray-type process into a reactor having multiple temperature zones. Rapid evaporation occurs in a first zone, followed by mixed-metal organic foam formation in a second zone, followed by amorphous and partially crystalline oxide precursor formation in a third zone, followed by formation of the substantially crystalline mixed-metal oxide in a fourth zone. The method operates in a continuous rather than batch manner and the use of small droplets as the starting material for the temperature-based process allows relatively high temperature processing. In a particular embodiment, the first zone operates at 100-300.degree. C., the second zone operates at 300-700.degree. C., and the third operates at 700-1000.degree. C., and fourth zone operates at at least 700.degree. C. The resulting crystalline mixed-metal oxides display a high degree of crystallinity and sphericity with typical diameters on the order of 50 .mu.m or less.

Inventors:
; ; ;
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1214149
Patent Number(s):
9,126,833
Application Number:
14/296,643
Assignee:
U.S. Department of Energy (Washington, DC) NETL
Resource Type:
Patent
Resource Relation:
Patent File Date: 2014 Jun 05
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Berry, David A., Haynes, Daniel J., Shekhawat, Dushyant, and Smith, Mark W.. Method for continuous synthesis of metal oxide powders. United States: N. p., 2015. Web.
Berry, David A., Haynes, Daniel J., Shekhawat, Dushyant, & Smith, Mark W.. Method for continuous synthesis of metal oxide powders. United States.
Berry, David A., Haynes, Daniel J., Shekhawat, Dushyant, and Smith, Mark W.. Tue . "Method for continuous synthesis of metal oxide powders". United States. https://www.osti.gov/servlets/purl/1214149.
@article{osti_1214149,
title = {Method for continuous synthesis of metal oxide powders},
author = {Berry, David A. and Haynes, Daniel J. and Shekhawat, Dushyant and Smith, Mark W.},
abstractNote = {A method for the rapid and continuous production of crystalline mixed-metal oxides from a precursor solution comprised of a polymerizing agent, chelated metal ions, and a solvent. The method discharges solution droplets of less than 500 .mu.m diameter using an atomizing or spray-type process into a reactor having multiple temperature zones. Rapid evaporation occurs in a first zone, followed by mixed-metal organic foam formation in a second zone, followed by amorphous and partially crystalline oxide precursor formation in a third zone, followed by formation of the substantially crystalline mixed-metal oxide in a fourth zone. The method operates in a continuous rather than batch manner and the use of small droplets as the starting material for the temperature-based process allows relatively high temperature processing. In a particular embodiment, the first zone operates at 100-300.degree. C., the second zone operates at 300-700.degree. C., and the third operates at 700-1000.degree. C., and fourth zone operates at at least 700.degree. C. The resulting crystalline mixed-metal oxides display a high degree of crystallinity and sphericity with typical diameters on the order of 50 .mu.m or less.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {9}
}

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