Chromium oxide catalysts with low valence state ions for heterocyclic ring formation

Conclusions In aluminum-chromium catalysts promoted by potassium and rare-earth oxides, used in the synthesis of 2-methylthiophene by heterocyclization of n-pentane with hydrogen sulfide, there are present low-valence cations of chromium and the rare-earth that enter into the active centers of the catalysts.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 782–784, April, 1986.