MECHANISTIC STUDIES OF SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE WITH AMMONIA OVER V2O5 TIO2 (ANATASE) CATALYSTS THROUGH TRANSIENT ISOTOPIC LABELING AT STEADY-STATE/
Us. Ozkan et al., MECHANISTIC STUDIES OF SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE WITH AMMONIA OVER V2O5 TIO2 (ANATASE) CATALYSTS THROUGH TRANSIENT ISOTOPIC LABELING AT STEADY-STATE/, Journal of physical chemistry, 99(8), 1995, pp. 2363-2371
Isotopic tracers studies were performed to investigate the reaction ne
twork of selective catalytic reduction (SCR) on vanadia catalysts supp
orted over titania. The catalysts were characterized using BET surface
area analysis, X-ray diffraction, laser Raman spectroscopy, scanning
electron microscopy, X-ray photoelectron spectroscopy, and thermal ana
lysis techniques. The product analysis was carried out by a combinatio
n of chemiluminescence NO, analysis, gas chromatography-mass spectrome
try, and chemical titration methods. The isotopic labeling experiments
were performed under steady-state conditions by using N-15- and O-18-
containing species. The results obtained in these experiments were com
bined with the nitric oxide and oxygen exchange experiments to arrive
at conclusions regarding the pathways of the SCR reactions. The role o
f ammonia oxidation has been quantified in the overall SCR reaction ne
twork at higher temperatures.