[In situ diffuse reflectance FTIR spectroscopy study of the selective catalytic reduction reaction of NO over Ag/SAPO-34 catalysis].
An in situ diffuse reflectance FTIR spectroscopy (DRIFTS) study of the selective catalytic reduction (SCR) of NO with propene in the presence of excess O2 was carried out over Ag/SAPO-34 catalyst. The SCR reaction was investigated at temperatures from 573 to 773 K, and the role of oxygen in the NO reduction process was determined by comparing experiments using an initial reaction mixture containing oxygen and without oxygen. The results show that both NO and propene are easily activated in oxygen. Furthermore, the presence of oxygen is necessary to form organo-NOx adsorbed species. Based on these experiments, a reaction mechanism is proposed that NO, propene and oxygen react to form organo-nitro and organo-nitrito adsorbed species as key intermediates, and then these intermediates decompose to nitrogen.
Zhang
Ping
P
Department of Environmental Science, Guangzhou University, Guangzhou, Department of Chemical Engineering, South China University of Technology, Guangzhou 510630, China.
Wang
Le-fu
LF
Xu
Jian-chang
JC
D000327:Adsorption; D002384:Catalysis; D009589:Nitrogen Oxides / Q000737:chemistry*; D010084:Oxidation-Reduction; D012834:Silver / Q000737:chemistry; D018030:Silver Compounds / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*
D009589:Nitrogen Oxides; D018030:Silver Compounds; D012834:Silver