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Abstract
Compounds of general formula A2B2O7 have been characterized by X-ray diffraction and tested for catalytic activity in oxidative coupling of methane. Calculations of the rare earth-oxygen (AO) and cocation-oxygen (BO) bond energies provide a new way to estimate the influence of bulk parameters on the formation of C2 hydrocarbons. The observed values of C2 yields on A2B2O7 catalysts (A = Sm, Gd or Eu) (B = Ti, Zr, or Sn) indicate that they increase with decreasing cocation-oxygen bond energy. The best of these systems (Sm2Sn2O7) gives a C2 yield amounting to 20% at 973 K.
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