Nevertheless, a number of results showing the practical potential of zeolite-based catalysts
in environmental catalysis are still increasing and catalysts with real practical importance for
a number of processes have already been discovered and applied. Both basic and applied
research are behind this progress, and accordingly, a report on the progress in successful
application of metallo-zeolites for environmental processes must take account of published
research articles as well as patent literature and technical reports. This review mostly includes
results obtained during the last decade, but will try to document the trends in the developments
in the field of deN2O and deNOx processes over zeolite catalysts over a broader period.
Even then, both the basic science literature as well as the patent applications are too plentiful
and this text could not attempt to provide complete coverage of the field, but would try to
document the principal trends.