New catalyst useful in selective nitrogen oxides reduction process.

摘要

The invention relates to a catalyst comprising a support based on porous alumina and at least one catalytically active phase, the catalyst support comprising a surface layer of at least one compound of spinel type.
The invention also relates to a process for preparing the catalyst and to a process for removing the nitrogen oxides present in a gas stream which may also contain sulphur oxides, using the said catalyst.