Hydrogen permeation through mixed protonic-electronic conducting materials
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United States of America Patent
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Oct 2, 2001
Grant Date -
May 24, 2001
app pub date -
Apr 30, 1999
filing date -
Apr 30, 1999
priority date (Note) -
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Abstract
An ionic conductor has been developed which exhibits both hydrogen ion conductivity and electronic conductivity. The conductor is a perovskite-type oxide represented by the general formula: ABO.sub.3 where A consists of at least one element selected from the group consisting of Ba, Ca, Mg and Sr and B is Ce.sub.1-x M.sub.x where M is a multivalent dopant metal, preferably Eu or Tb, and x is greater than 0 and less than 1. It is particularly useful in processes in which hydrogen is separated from a hydrogen-containing gas, e.g. in conversion of natural gas, operation of hydrogen fuel cells, etc.
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