Methods for lowering the nitrogen oxides content of exhaust gases.

摘要

Catalytic cracking or selective contact reduction of NOx in exhaust gases is improved in these known processes by use of a Chevrel phase compound as the catalyst. The catalytic compounds have the formula Mx Mo6 S8-y and/or Mx Mo6 S8-y Oz, where M is metal, S is chalcogen, O is oxygen, x is 1-5, 8-y is 7.4-8.5 and z is from 2 to 8.