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Mixed conducting membranes for syngas production

United States Patent

6,492,290
December 10, 2002
View the Complete Patent at the US Patent & Trademark Office
This invention presents a new class of multicomponent metallic oxides which are particularly suited toward use in fabricating components used in processes for producing syngas. The non-stoichiometric, A-site rich compositions of the present invention are represented by the formula (Ln.sub.x Ca.sub.1-x).sub.y FeO.sub.3-.delta. wherein Ln is La or a mixture of lanthanides comprising La, and wherein 1.0>x>0.5, 1.1.gtoreq.y>1.0 and .delta. is a number which renders the composition of matter charge neutral. Solid-state membranes formed from these compositions provide a favorable balance of oxygen permeance and resistance to degradation when employed in processes for producing syngas. This invention also presents a process for making syngas which utilizes such membranes.
Dyer; Paul Nigel (Allentown, PA), Carolan; Michael Francis (Allentown, PA), Butt; Darryl (Gainesville, FL), Van Doorn; Rene Hendrick Elias (Neckarsulm, DE), Cutler; Raymond Ashton (Bountiful, UT)
Air Products and Chemicals, Inc. (Allentown, PA)
09/ 643,698
August 22, 2000
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under Cooperative Agreement DE-FC26-97PC96052 awarded by the United States Department of Energy. The Government has certain rights in this invention.