Removal of NOx by photocatalytic processes

Publication date: March 2013 Source:Journal of Photochemistry and Photobiology C: Photochemistry Reviews, Volume 14 Author(s): Janusz Lasek , Yi-Hui Yu , Jeffrey C.S. Wu The photocatalytic methods for nitrogen oxides removal were recently very intense areas of scientific research. Photo-deNO x 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 NO x 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-deNO x applications. The mechanism of NO creation and the traditional methods (primary and secondary) of NO x removal are summarized and discussed. A cooperative system that combines the traditional (thermal) process and a photo-process is then proposed for improving NO x removal efficiency. Graphical abstract Highlights ▶ The NO x removal can be divided into two groups, primary and secondary methods. The photo de-NO x processes are classified as the secondary method. Three ways of de-NO x by photocatalytic reactions are photo selective catalytic reduction, photo-oxidation and photodecomposition. ► Three ways of removing NO x by photocatalytic reactions, p...
Source: Journal of Photochemistry and Photobiology C: Photochemistry Reviews - Category: Chemistry Source Type: research