Catalytic Reduction of NOX Over TiO2–Graphene Oxide Supported with MnOX at Low Temperature

Abstract

TiO 2 -graphene oxide (TiO 2 -GO) nanocomposites were prepared by the sol-gel method with different mass ratios of GO. The MnO X active components were loaded by means of ultrasonic impregnation. The catalysts exhibited excellent physical structures and electron transfer properties, which favored the catalytic activity. All of the catalysts were characterized by FESEM, XRD, TEM, BET, FT-IR, and XPS. The catalytic reduction activities of NO X were studied under low temperature conditions using ammonia as the reductant. Results indicated GO formation in the TiO 2 -GO supports, which reveals that TiO 2 -GO can be readily indexed as anatase TiO 2 in all samples. Various valence states of manganese species coexisted in the MnO X /TiO 2 -GO catalysts. Non-stoichiometric (MnO X / Mn) on the surface of the composite catalysts was particularly beneficial to electron transfer, resulting in good redox performance. The optimum mass ratio of Mn in MnO X /TiO 2 -0.8 % GO was 9 wt%, and catalyst with this amount of Mn exhibited good resistance to H 2 O and SO 2 . All of the samples showed excellent N 2 selectivity. Graphical Abstract The surface of the GO sheets is covered by a uniform layer of MnO X which increasing the activity of the catalyst by 9 % MnO X /TiO 2 -0.8 % GO.

A Review on Selective Catalytic Reduction of NOx by NH3 over Mn–Based Catalysts at Low Temperatures: Catalysts, Mechanisms, Kinetics and DFT Calculations

“…Graphene, a new carbon nanomaterial, has the exceptional properties of a large theoretical specific surface area, flexible structure, high electron mobility and excellent conductivity. Thus, it was used as a carrier for SCR to promote the electron transfer between various Mn cations because of the efficient electron gain and loss in GE bringing the improvement in the redox performance [152][153][154][155]. Xiao et al [152] found that MnO x -CeO 2 /Graphene (0.3 wt %) was an environmentally-benign catalyst for controlling NO x , which exhibited excellent NH 3 -SCR activity and strong resistance against H 2 O and SO 2 .…”

Effect of Reduced Grapheme Oxide in Enhancing the Photocatalytic Activity of β-NaYF<sub>4</sub>:Ho<sup>3+</sup>@TiO<sub>2</sub>

“…The results show that all the diffraction peaks of the NYFH could be assigned to hexagonal phase β-NaYF 4 (JCPDS. , which is the best UC luminescence of the matrix materials [24]. The diffraction peaks of anatase TiO 2 (JCPDS no.…”

Preparation of a Leaf-Like BiVO4-Reduced Graphene Oxide Composite and Its Photocatalytic Activity

“…We can observe a strong absorption band of GO at 3410 cm −1 due to the O-H stretching vibration. The characteristic peaks at 1736, 1628, 1406, and 1089 cm −1 can be ascribed to carboxyl or carbonyl C=O stretching, carboxyl-OH stretching, C=C stretching, phenolic C-OH stretching, and alkoxy C-O stretching, respectively [29,30]. In contrast to GO, the various oxygencontaining groups (800-1900 cm −1 ) in BiVO 4 -rGO and GR are significantly decreased or even disappeared, indicating that the hydrothermal synthesis is an effective method for reducing GO into rGO.…”