MnOx/TiO2 composite nanoxides synthesized by deposition-precipitation method as a superior catalyst for NO oxidation

Wu, Zhongbiao; Tang, Nian; Xiao, Ling; Liu, Yue; Wang, Haiqiang

doi:10.1016/j.jcis.2010.08.031

Cited by 113 publications

(65 citation statements)

References 33 publications

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“…Among these catalysts, there has been some attention focused on cobalt oxides [10] and manganese oxides [11]. It was reported that cobalt oxides possess better oxidation ability [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Catalytic Activity of Mn-Co/TiO2 Catalysts for NO Oxidation to NO2 at Low Temperature

et al. 2016

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Abstract:A series of Mn-Co/TiO 2 catalysts were prepared by wet impregnation method and evaluated for the oxidation of NO to NO 2 . The effects of Co amounts and calcination temperature on NO oxidation were investigated in detail. The catalytic oxidation ability in the temperature range of 403-473 K was obviously improved by doping cobalt into Mn/TiO 2 . These samples were characterized by nitrogen adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM) and hydrogen temperature programmed reduction (H 2 -TPR). The results indicated that the formation of dispersed Co 3 O 4¨C oMnO 3 mixed oxides through synergistic interaction between Mn-O and Co-O was directly responsible for the enhanced activities towards NO oxidation at low temperatures. Doping of Co enhanced Mn 4+ formation and increased chemical adsorbed oxygen amounts, which also accelerated NO oxidation.

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Section: Introductionmentioning

confidence: 99%

Characterization and Catalytic Activity of Mn-Co/TiO2 Catalysts for NO Oxidation to NO2 at Low Temperature

et al. 2016

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“…With the supply of NO and O 2 mixture, the bands at 1741,1697,1648,1627,1559,1508, and 1457 cm -1 were clearly observed. These bands could be assigned to N 2 O 4 (a) (1741 and 1697 cm -1 ) (Zhou et al, 2011), bridging nitrate species (1648 and 1627 cm -1 ) (Kijlstra et al, 1997a;Zhao et al, 2009), bidentate nitrate (1559 cm -1 ) (Liu and He, 2010;Wu et al, 2010;Zhou et al, 2011;Zhang et al, 2013a), monodentate nitrate (1539 cm -1 ) (Zhang et al, 2013a), and nitrite species (1508 and 1457 cm -1 ) (Kijlstra et al, 1997a;Jin et al, 2010). When NO and O 2 were absorbed onto the surface of MnO x /MWCNTs catalysts for about 15 min, the intensity of bands at 2236 and 2221 cm -1 were detected and became larger afterwards.…”

Section: No and O 2 Co-adsorption On Mno X /Mwcntsmentioning

confidence: 99%

“…For some manganese catalysts, such as MnO x /TiO 2 (Pena et al, 2004;Wu et al, 2007;Wu et al, 2010), unsupported MnO x Chen, 2007), MnO x /Al 2 O 3 (Kijlstra et al, 1997a, b), and perovskite-type manganese oxides (Zhang et al, 2013b), some aspects of the reaction mechanism were similar, but some were distinguishably different, in particular, at the initial step of adsorption of NH 3 on these catalysts. It was reported that NH 3 adsorbed on the Lewis sites was more active than NH 4 + species in the SCR reaction (Zhu et al, 2013;Fu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

In Situ DRIFTS Study of the Low Temperature Selective Catalytic Reduction of NO with NH3 over MnOx Supported on Multi-Walled Carbon Nanotubes Catalysts

Wang

Huang

2015

Aerosol Air Qual. Res.

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MnO x supported on multi-walled carbon nanotubes (MWCNTs) catalysts were prepared by the pore volume impregnation method and used for low-temperature selective catalytic reduction (SCR) of NO with NH 3 . Based on the previous study, 10 wt.% loading MnO x /MWCNTs were then selected for investigation of the reaction mechanism by in situ Diffuse Reflectance Infrared Fourier Transform spectroscopy (in-situ DRIFTS). The important intermediates in the SCR of NO x process at 210°C were discussed based on the DRIFTS results. Furthermore, the NH 3 -SCR reaction pathways over MnO x /MWCNTs catalysts were proposed. The results showed that NH 4 + species on Brønsted acid sites and coordinate ammonia species on Lewis acid sites existed during the SCR reaction. NH 4 + species was more active than coordinate ammonia species over the catalysts at 210°C. Most of NO x ad-species would react with NH 3 ad-species. However, nitrite species, bidentate and monodentate nitrates contributed to the SCR reaction over the catalysts mostly. Two possible reaction pathways were proposed. One was that NO x ad-species could react with NH 4 + to form intermediate of NH 4 N 2 O 4 (a), NH 4 NO 2 (a) or NH 4 NO 3 (a), then to produce N 2 and H 2 O as the final products. The other pathway was that NH 3 was initially adsorbed on active site and NH 2 was formed, then NH 2 reacted with NO x ad-species to produce intermediate NH 2 NO 2 or NH 2 NO 3 which were unstable and would decompose into N 2 and H 2 O.

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“…S BET (m 2 /g) Pore size (nm) (B-sites)of the sample [23][24][25]. Two weak peaks at 1195 cm À1 and 1330 cm À1 were also observed, which were assigned to symmetric bending vibration of N-H in NH 3 coordinated to Lewis acid sites [24][25][26] (L-sites) and attributed to coordinatively adsorbed NH 3 on Lewis acid sites [15] (marked as L1and L2), respectively.…”

Section: Samplesmentioning

confidence: 99%

Novel ultrasonic–modified MnO /TiO2 for low-temperature selective catalytic reduction (SCR) of NO with ammonia

Zhang

Zhao

et al. 2011

Journal of Colloid and Interface Science

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MnOx/TiO2 composite nanoxides synthesized by deposition-precipitation method as a superior catalyst for NO oxidation

Cited by 113 publications

References 33 publications

Characterization and Catalytic Activity of Mn-Co/TiO2 Catalysts for NO Oxidation to NO2 at Low Temperature

Characterization and Catalytic Activity of Mn-Co/TiO2 Catalysts for NO Oxidation to NO2 at Low Temperature

In Situ DRIFTS Study of the Low Temperature Selective Catalytic Reduction of NO with NH3 over MnOx Supported on Multi-Walled Carbon Nanotubes Catalysts

Novel ultrasonic–modified MnO /TiO2 for low-temperature selective catalytic reduction (SCR) of NO with ammonia

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