The emission of nitrogen oxides (NOx, x = 1, 2) from combustion engines is a significant contributor to acid rain, smog and the enhanced greenhouse effect. The environmental damage these polluntants have caused, as well as human health concerns, has led to governmental regulations aimed at reducing NOx emissions. As the decomposition of NOx gases (deNOx) is difficult due to a high activation barrier, and catalytic technologies have been developed to assist in their subsequent breakdown. These technologies use rhodium, palladium and platinum precious metals employed on oxide suppports. where 111 facets are the dominant surface on the metal clusters. Rhodium is known to be the most effective metal for NOx reduction flue to facile breaking of the NO bond; however, it is becoming increasingly scarce and thus progressively more expensive to use. This has led to significant interest in rhodium free technologies, motivating research to develop alternative, more cost effect...