Preparation and evaluation of iron nanoparticles embedded CNTs grown on ZSM-5 as catalysts for NO decomposition

An Experimental and Density Functional Theory Simulation Study of NO Reduction Mechanisms over Fe0 Supported on Graphene with and without CO

“…It can be seen that the peaks located at 30.27, 35.68, 43.34, and 63.02°appeared, indicating the presence of Fe 2 O 3 (JCPDS #39-1346) in the spent catalysts. 29 The results are consistent with our previous work, and this may be due to the oxidation of Fe 0 by NO during the reaction. 15 The in situ FTIR spectra of species and intermediates adsorbed on the graphene (G) surface during NO reduction, with and without CO, at 350 °C and different reaction times are shown in Figure 4.…”

“…XRD patterns obtained for the spent catalysts, after they were used during NO reduction with and without CO, are shown in Figure . It can be seen that the peaks located at 30.27, 35.68, 43.34, and 63.02° appeared, indicating the presence of Fe 2 O 3 (JCPDS #39-1346) in the spent catalysts . The results are consistent with our previous work, and this may be due to the oxidation of Fe 0 by NO during the reaction …”

“…The main diffraction peaks at 2θ values of 22.2 and 44.4° can be attributed to (002) and (101) phases, respectively (JCPDS #41-1487). , The peak at 22.2° for G was shifted to a lower value for x Fe/G because the iron addition had widened the spacing between the layers of the graphene. For 5Fe/G, the Fe 0 diffraction peaks appeared at 2θ = 44.8, 65.0, and 82.3° and can be assigned to the (110), (200), and (211) planes, respectively (JCPDS #06-0696), − indicating the presence of Fe 0 in the catalyst. No diffraction peaks assigned to Fe 0 were detected for 0.3Fe/G, illustrating that Fe 0 was indeed highly dispersed on the catalyst surface.…”

Original exploration of transition metal single-atom catalysts for NOxreduction

“…Based on the above discussions and previous literature, 62,63 possible NO x reduction schemes can be proposed. In the presence of O 2 , NO could be oxidized to more easily adsorb NO 2 and NO x is generally adsorbed on the Lewis acid sites on the catalyst surface to form chelating bridged nitrate and monodentate nitrites.…”

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH3–SCR

“…Carbon nanotube (CNT) is a typical mesoporous material with unique electronic properties and adsorption selectivity, , making it a promising candidate for catalysis applications. − Li et al had prepared Cu-doped CNT catalysts (Cu-CNTs) for SCR application. The results show that the Cu-CNTs had the best NO x removal activity and regenerability compared to activated carbon (AC) and graphite substrates (Gs) (Cu-AC and Cu-Gs) .…”