High N2 selectivity of Pt-V-W/TiO2 oxidation catalyst for simultaneous control of NH3 and CO emissions

Influence of deposition order of dual active components on the NH3-SCO performance of the bimetallic Pt–V system supported on TiO2

“…24 Besides, there was a diffraction peak of PtVO x composite oxide (ICDD 19-0918) in the XRD spectra of the Pt 0.04 V 0.5 /TiO 2 catalyst, suggesting that there were PtVO x microcrystals on the surface of the Pt 0.04 V 0.5 /TiO 2 catalyst. 34 There was no obvious diffraction peak that was assigned to Pt species in the XRD patterns of the Pt 0.04 /TiO 2 , V 0.5 /Pt 0.04 /TiO 2 , Pt 0.04 /V 0.5 /TiO 2 and Pt 0.04 V 0.5 /TiO 2 catalysts, which might be mainly ascribed to the low Pt addition amount in these catalysts.…”

“…The results suggested that the Pt 0.3 V 3 W 2 /TiO 2 catalyst exhibited 100% NH 3 conversion and 90% N 2 selectivity at 350 °C, owing to the synergistic effect between NH 3 -SCO and CO-SCR reactions. 34 Kim et al modified the Pt 0.1 /TiO 2 catalyst (0.1 wt% Pt) with 2 wt% V for removing 200 ppm NH 3 , and found that the Pt 0.1 /V 2 /TiO 2 catalyst achieved complete NH 3 conversion and ∼80% N 2 selectivity at 250 °C. 35 Although the Pt–V bimetallic catalytic system has presented good NH 3 -SCO performance, there are still challenges in balancing the NH 3 conversion activity and N 2 selectivity, as well as further reducing the dosage of Pt.…”

“…35 Although the Pt–V bimetallic catalytic system has presented good NH 3 -SCO performance, there are still challenges in balancing the NH 3 conversion activity and N 2 selectivity, as well as further reducing the dosage of Pt. 34,35 The authors considered that the catalytic performance of the Pt–V bimetallic catalytic system significantly depended on the combination mode of the Pt and V components. The optimization of the deposition order of the Pt and V components is expected to further improve the comprehensive performance of the Pt–V bimetallic catalytic system, thus solving the above challenges, but the relevant studies are still scarce.…”

Mechanism of NO reduction by NH3 over CuMnOx catalysts and the influence mechanism of CO

“…This is because of the existence of a large number of these active substances. The catalytic activity in the medium temperature range of the SCR reaction was not affected by CO. Further, Byun et al 62 proved through experiments that competition exists between NH 3 and CO. As shown in Fig. 9f, a large number of carbonate substances formed by CO at low temperatures blocked the pore size of the catalyst, thereby inhibiting the adsorption of NH 3 molecules on the sample surface, and thus limiting the reaction between NH 3 and nitrate.…”

Effect of Potassium on the Performance of a CuSO₄/TiO₂ Catalyst Used in the Selective Catalytic Reduction of NO_<i>x</i> by NH₃

“…N2O is the main byproduct of NH3-SCR reaction and it is a main greenhouse gas with a 310-time greenhouse effect of CO2 23,24 . Therefore, the effect of K on N2 selectivity of CuSO4/TiO2 catalyst and commercial VWTi catalyst was investigated, as shown in Fig.…”