Oxygen-deficient, barium-containing perovskites.

摘要

A class of oxygen-deficient, barium-containing compounds having a perovskite-type structure may be prepared which are of the formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="8" wi="24" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>if M is a trivalent cation, or
<Chemistry id="chema02" num="0002"><Image id="ia02" he="6" wi="34" file="IMGA0002.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>if M is a divalent cation,
wherein M is Mg, Ca, Sr, Ba, Sc, Y, La, the lanthanides of atomic number 58 or greater, Ni, Fe, Cu, Al, Ga, In, Zn, Cd, Hg, Bi, Tl or a mixturethereof, M'is Sb or Bi, a is equal to or greater than 0 but less than or equal to 1, and ifM is trivalent, y is equal to or greater than 0 but less than 1, and if M is divalent, y is equal to or greater than 0 but less than (3+a)/2.

Preferably, these compounds are of the formula:
<Chemistry id="chema03" num="0003"><Image id="ia03" he="6" wi="25" file="IMGA0003.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>
where M is La or Sc, a is equal to or greater than 0 but less than or equal to 1 and y is equal to or greater than 0 but less than 1.

This class of compounds are readily reoxidized and therefore are useful in oxidative dehydrogenation reactions.