In Situ Diffuse Reflectance FTIR Study of the Selective Catalytic Reduction of NO by NH3 over Vanadia-Titania Aerogels

An ONIOM and DFT study of water and ammonia adsorption on anatase TiO2 (001) cluster

“…Table III shows the comparison of the vibrational properties of molecularly and dissociatively adsorbed NH 3 molecule on the (001) surface with available experimental data reported for anatase surfaces in general. As it is seen from the agreement with the experimental values of (1599 cm À1 [41], 1600 cm À1 [43]), and 3350 cm À1 [43], respectively. And also, vibration frequency value (1464 cm À1 ) for scissoring mode of NH 2 species for the dissociative ammonia adsorption is quite comparable with the experimental value of 1480 cm À1 [43].…”

“…As it is seen from the agreement with the experimental values of (1599 cm À1 [41], 1600 cm À1 [43]), and 3350 cm À1 [43], respectively. And also, vibration frequency value (1464 cm À1 ) for scissoring mode of NH 2 species for the dissociative ammonia adsorption is quite comparable with the experimental value of 1480 cm À1 [43]. For the transition state of dissociative ammonia adsorption vibrational frequency values are also evaluated and illustrated in Table III.…”

Environmental Catalysis — Stationary Sources

“…Their results supported the mechanism proposed by Janssen et al [104]. From the signal intensities at 1435 and 1660 cm-' it was concluded that ammonia adsorbs on Brarnsted sites [112]. The 1435 cm-' band was assigned to the vd(F) bending mode of ammonia adsorbed on Brarnsted sites.…”

“…[112] characterized the active surface species of vanadia on titania by means of diffuse reflectance FTIR. Their results supported the mechanism proposed by Janssen et al [104].…”

DEVELOPMENT OF MULTI-TASK CATALYSTS FOR REMOVAL OF NOx AND TOXIC ORGANIC COMPOUNDS DURING COAL COMBUSTION

“…Supporting results were published using vanadia/titania (V 2 O 5 /TiO 2 ) aerogels. In this case, Brønsted acidity was shown to facilitate the reduction of NO to N 2 , and catalytic activity improved as vanadia content increased (Schneider et al, 1994). In contrast, it has been shown that unsaturated V 4+ oxovanadyls are the active sites for the reduction of NO (Ciambelli et al, 1989).…”