Remarkable promoting effect of rhodium on the catalytic performance of Ag/Al2O3 for the selective reduction of NO with decane

Review of Ag/Al2O3-Reductant System in the Selective Catalytic Reduction of NO x

“…18b appeared gradually, accompanied by the disappearance of -NCO, and this new peak may be due to a deformation mode of adsorbed NH x on Ag/Al 2 O 3 [47,48]. At the same time, a weak peak was observed at 3,450 cm -1 , which may be assigned to the stretching vibration mode of NH species [49]. On the basis of the results described above, the consumption of -NCO species may be related to the rapid hydrolysis of -NCO species in the flow of NO + O 2 + H 2 , resulting in the formation of NH x species.…”

Hydrogen promotes the selective catalytic reduction of NO by ethanol over Ag/Al2O3

“…5(b) gradually showed up accompanied with the disappearance of ANCO, and this new peak may be due to a deformation mode of adsorbed NHx [16,17]. At the same time, a weak peak was also observed at 3450 cm À1 , which may be assigned to the stretching vibration mode of NH species [18]. Based on the results above, the consumption of ANCO species may be related with rapid hydrolysis of ANCO species in the flow of NO + O 2 + H 2 , resulting in the formation of NHx species.…”

Promotional Effect of Titanium on the Catalytic Performance of Anodic Alumina Supported Silver Catalyst for the Selective Reduction of NO with Propene

“…Therefore, the addition of a second metal element as catalyst promoter is considered to be another candidate. A promotional effect on the low-temperature activity by adding 0.05 wt% Rh to 4 wt% Ag/Al 2 O 3 was reported by Sato et al (2003). The higher formation rate of isocyanate, which was a major reaction intermediate, was considered to be a main reason.…”

“…In addition, Sato et al (2003) investigated the effect of noble metal additives (Rh, Ir, Ru, Pd, Pt) on the catalytic activity of 4 wt% Ag/Al 2 O 3 , and reported that Ag/Al 2 O 3 with small amounts of Rh (0.05 wt%) showed excellent activity for NO reduction by decane at low temperatures. FT-IR measurements revealed that the formation rate of isocyanate species was higher on Rhpromoted Ag/Al 2 O 3 .…”

“…Several authors focused on a reaction mechanism in which a hydrocarbon reducing agent was activated through partial oxidation. This activated hydrocarbon was proposed to react with nitrates on the catalyst surface to form organic nitrate intermediates, and finally lead to nitrogen and carbon oxides (Shimizu et al, 2001;Furusawa et al, 2003;He et al, 2003;Sato et al, 2003). In SCR of NO with propene, oxygenated hydrocarbons adsorbed on the catalyst surface (acetate) were detected by in situ Fourier-Transform infrared (FTIR) spectroscopy (Satokawa et al, 2003).…”