Low-temperature NO oxidation over Mn/TiO2 nanocomposite synthesized by chemical vapor condensation: Effects of Mn precursor on the surface Mn species

Park, Eunseuk; Chin, Sungmin; Jeong, Juyoung; Jurng, Jongsoo

doi:10.1016/j.micromeso.2012.07.009

Cited by 36 publications

(26 citation statements)

References 39 publications

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“…Mn-based catalysts are considered as the promising candidates for NO oxidation to NO 2 . Many Mn-based catalysts (e.g., MnO x /TiO 2 [20,21,22], Ce–Mn/TiO 2 [23], FeMnO x /TiO 2 [24,25]) have been studied. The results show that MnO x supported on TiO 2 (P25) prepared by deposition-precipitation (DP) method and chemical vapor condensation method exhibits high catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation of NO over MnOx–CeO2 and MnOx–TiO2 Catalysts

et al. 2016

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A series of MnO x -CeO 2 and MnO x -TiO 2 catalysts were prepared by a homogeneous precipitation method and their catalytic activities for the NO oxidation in the absence or presence of SO 2 were evaluated. Results show that the optimal molar ratio of Mn/Ce and Mn/Ti are 0.7 and 0.5, respectively. The MnO x -CeO 2 catalyst exhibits higher catalytic activity and better resistance to SO 2 poisoning than the MnO x -TiO 2 catalyst. On the basis of Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), and scanning transmission electron microscope with mapping (STEM-mapping) analyses, it is seen that the MnO x -CeO 2 catalyst possesses higher BET surface area and better dispersion of MnO x over the catalyst than MnO x -TiO 2 catalyst. X-ray photoelectron spectroscopy (XPS) measurements reveal that MnO x -CeO 2 catalyst provides the abundance of Mn 3+ and more surface adsorbed oxygen, and SO 2 might be preferentially adsorbed to the surface of CeO 2 to form sulfate species, which provides a protection of MnO x active sites from being poisoned. In contrast, MnO x active sites over the MnO x -TiO 2 catalyst are easily and quickly sulfated, leading to rapid deactivation of the catalyst for NO oxidation. Furthermore, temperature programmed desorption with NO and O 2 (NO + O 2 -TPD) and in situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTS) characterizations results show that the MnO x -CeO 2 catalyst displays much stronger ability to adsorb NO x than the MnO x -TiO 2 catalyst, especially after SO 2 poisoning.

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Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation of NO over MnOx–CeO2 and MnOx–TiO2 Catalysts

et al. 2016

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“…5c, the high dispersion MnO x on 3DOM carbon was much easier to be observed. 11,14,17,[71][72][73][74][75][76][77][78][79] The superior catalytic performance of the MnO x /3DOMC was mainly ascribed to the followings. In addition, there were numerous mesopores with an average size of 5 nm randomly distributed in the macropore walls of the 3DOM carbon scaffold.…”

Section: Resultsmentioning

confidence: 99%

Highly dispersed MnO_x nanoparticles supported on three-dimensionally ordered macroporous carbon: a novel nanocomposite for catalytic reduction of NO_x with NH₃ at low temperature

Gao

Song

et al. 2015

RSC Adv.

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In this paper, we report a novel nanocomposite of MnO x nanoparticles supported by three-dimensionally ordered macroporous carbon (MnO x /3DOMC) fabricated by means of a simple multi-component infiltration of three-dimensional templates and its use as a catalyst for low-temperature selective catalytic reduction (SCR) of NO x with NH 3 . Several techniques, including scanning electron microscopy, X-ray diffraction, N 2 -sorption, transmission electron microscopy, X-ray photoelectron spectroscopy, NH 3 temperature-programmed desorption, and H 2 temperature-programmed reduction, are employed to characterize the MnO x /3DOMC nanocomposite. The results demonstrate that MnO x /3DOMC possesses a highly ordered macroporous structure with hierarchical mesopores in the walls of the macroporous skeleton. MnO x nanoparticles of 2-4 nm are observed to be highly dispersed on the 3DOM carbon scaffold. Compared with the MnO x /NAC and MnO x /TiO 2 catalysts prepared by a conventional impregnation method, the MnO x /3DOMC catalyst exhibits better low-temperature NH 3 -SCR activity, stability, and water vapor and/or SO 2 resistance ability. Such material represents a promising exploratory direction for enhancing the catalytic performance of metal oxide-based NH 3 -SCR catalysts.

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“…[5][6][7][8] In particular, the applications of transition metal oxides to catalytic oxidation of NO were studied. [9][10][11][12] Among them, MnO x and CoO x have been reported to show good activity for NO catalytic oxidation. Qiu 13 prepared Mn-Co/TiO 2 catalysts with different loadings by wet impregnation method.…”

Section: Introductionmentioning

confidence: 99%

“…24504 | RSC Adv., 2020,10,[24493][24494][24495][24496][24497][24498][24499][24500][24501][24502][24503][24504][24505][24506] This journal is © The Royal Society of Chemistry 2020…”

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confidence: 99%

Catalytic oxidation of NO over MnO_x–CoO_x/TiO₂ in the presence of a low ratio of O₃/NO: activity and mechanism

et al. 2020

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Low-temperature NO oxidation over Mn/TiO2 nanocomposite synthesized by chemical vapor condensation: Effects of Mn precursor on the surface Mn species

Cited by 36 publications

References 39 publications

Catalytic Oxidation of NO over MnOx–CeO2 and MnOx–TiO2 Catalysts

Catalytic Oxidation of NO over MnOx–CeO2 and MnOx–TiO2 Catalysts

Highly dispersed MnO_x nanoparticles supported on three-dimensionally ordered macroporous carbon: a novel nanocomposite for catalytic reduction of NO_x with NH₃ at low temperature

Catalytic oxidation of NO over MnO_x–CoO_x/TiO₂ in the presence of a low ratio of O₃/NO: activity and mechanism

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Low-temperature NO oxidation over Mn/TiO2 nanocomposite synthesized by chemical vapor condensation: Effects of Mn precursor on the surface Mn species

Cited by 36 publications

References 39 publications

Catalytic Oxidation of NO over MnOx–CeO2 and MnOx–TiO2 Catalysts

Catalytic Oxidation of NO over MnOx–CeO2 and MnOx–TiO2 Catalysts

Highly dispersed MnOx nanoparticles supported on three-dimensionally ordered macroporous carbon: a novel nanocomposite for catalytic reduction of NOx with NH3 at low temperature

Catalytic oxidation of NO over MnOx–CoOx/TiO2 in the presence of a low ratio of O3/NO: activity and mechanism

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Highly dispersed MnO_x nanoparticles supported on three-dimensionally ordered macroporous carbon: a novel nanocomposite for catalytic reduction of NO_x with NH₃ at low temperature

Catalytic oxidation of NO over MnO_x–CoO_x/TiO₂ in the presence of a low ratio of O₃/NO: activity and mechanism