Characterization of Cu-SSZ-13 NH3 SCR catalysts: an in situ FTIR study
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- Characterization of Cu-SSZ-13 NH3 SCR catalysts: an in situ FTIR study
- Szanyi, Janos; Kwak, Jahun; Zhu, Haiyang; Peden, Charles H. F.
- EXCHANGED ZSM-5 ZEOLITES; LEAN NOX REDUCTION; NITRIC-OXIDE; CU-ZSM-5 CATALYSTS; NITROGEN MONOXIDE; REDOX CHEMISTRY; METHANE OXIDATION; CARBON-MONOXIDE; GASEOUS CUCL; DECOMPOSITION
- Issue Date
- ROYAL SOC CHEMISTRY
- PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.15, no.7, pp.2368 - 2390
- The adsorption of CO and NO over Cu-SSZ-13 zeolite catalysts, highly active in the selective catalytic reduction of NOx with NH3, was investigated by FTIR spectroscopy, and the results obtained were compared to those collected from other Cu-ion exchanged zeolites (Y,FAU and ZSM-5). Under low CO pressures and at room temperature (295 K), CO forms monocarbonyls exclusively on the Cu+ ions, while in the presence of gas phase CO dicarbonyls on Cu+ and adsorbed CO on Cu2+ centers form, as well. At low (cryogenic) sample temperatures, tricarbonyl formation on Cu+ sites was also observed. The adsorption of NO produces IR bands that can be assigned to nitrosyls bound to both Cu+ and Cu2+ centers, and NO+ species located in charge compensating cationic positions of the chabasite framework. On the reduced Cu-SSZ-13 samples the formation of N2O was also detected. The assignment of the adsorbed NOx species was aided by adsorption experiments with isotopically labeled (NO)-N-15. The movement of Cu ions from the sterically hindered six member ring position to the more accessible cavity positions as a result of their interaction with adsorbates (NO and H2O) was clearly evidenced. Comparisons of the spectroscopy data obtained in the static transmission IR system to those collected in the flow-through diffuse reflectance cell points out that care must be taken when general conclusions are drawn about the adsorptive and reactive properties of metal cation centers based on a set of data collected under well defined, specific experimental conditions.
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