Catalytically dehydrogenating short-chain alkane(s)

摘要

Continuous auto-thermal process for catalytically dehydrogenating short-chain alkanes comprises feeding a gas or gas mixture of 2-4C alkanes preheated to 2300-650 deg C in the presence of O2 at alkane partial pressure of more than 0.2 bar and a partial pressure ratio of alkane to oxygen of 1.3-7 over a charge of an oxidic catalyst of formula MAaBbPyOx (where M = Sc, Y, La, Nd, Pm, Sm, Eu, Gd, Dg, Ho, Er or Yb; A = Mg, Ca or Sr; a = 0.01-10; B = Li, Na, K or Cs; b = 0-0.2; y = 0.1; and x = stoichiometric number) for 10-400 ms at 1-3 bar, and igniting. A part of the alkane (mixture) is burnt above 650-900 deg C, oxidatively dehydrogenated and the residual part dehydrogenated to the corresponding 2-4C olefins by the heat produced thermally in homogeneous phase or in an inert charge connected to the catalyst. Also claimed is the catalyst itself.