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Removal of NOx by photocatalytic processes

2012; Elsevier BV; Volume: 14; Linguagem: Inglês

10.1016/j.jphotochemrev.2012.08.002

1873-2739

Janusz Lasek, Yi‐Hui Yu, Jeffrey C.S. Wu,

Industrial Gas Emission Control

The photocatalytic methods for nitrogen oxides removal were recently very intense areas of scientific research. Photo-deNOx processes offer interesting ways for abatement of these harmful gases. This review describes several methods for removing NO by photocatalytic reactions. These methods can be classified into three major groups: photo selective catalytic reduction (photo-SCR), photo-oxidation and photo-decomposition. The application of photocatalysts and photo-processes for NOx abatement in real-scale cases are presented. The fast-growing development of these methods is revealed by the large number of issued patents in photo-deNOx applications. The mechanism of NO creation and the traditional methods (primary and secondary) of NOx removal are summarized and discussed. A cooperative system that combines the traditional (thermal) process and a photo-process is then proposed for improving NOx removal efficiency.