A class of oxygen-deficient, barium-containing compounds having a perovskite-type structure may be prepared which are of the formula:if M is a trivalent cation, orif 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: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.
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