During the years numerous review papers were published covering various aspects of the
subject of research with zeolites in the N2O/NOx elimination, including relevant features of
the metallo-zeolite structures. Without attempting to list all of them, some of the more recent
should be mentioned, e.g., an extensive review devoted to the nature of active species in
copper-based catalysts and transformation of NOx by Centi and Perathoner [3], the first overview
in the area of the decomposition of nitrous oxide, including also the zeolite catalysts by
Kapteijn et al. [4], a comprehensive review of the catalytic reactions for the removal of NO by
Parvulescu et al. [5], a review analyzing the selective catalytic reduction of nitrogen oxides
with hydrocarbons over zeolite catalysts by Traa et al. [6], or a recent overview of the state of
the art in NH3-SCR-NOx using metallo-zeolites by Brandenberger et al. [7]. A base for understanding
the highly relevant redox properties of metallo-zeolites is included in an overview
published by Wichterlova et al. [8]. Among the papers presented from the point of view of the
individual technology and their potential application should be mentioned an overview on
catalytic abatement on NOx by Heck and Farrauto [9–11] and by Koebel et al. [12,13] on Urea-
SCR-NOx, showing this technology as very realistic for automotive diesel engines. Due to
utmost practical relevance of the deN2O and deNOx processes, very important sources represent
numerous technical reports, which even if in some cases lack complete information on
the composition and structure of the evaluated metallo-zeolite, bring valuable information on
the trends in applied research. In this context we should mention the evaluation by Johnson