Identification of MnO  species and Mn valence states in MnO /TiO2 catalysts for low temperature SCR

Fang, De; Xie, Jun; Hu, Hua; Hu, Yang; He, Feng; Fu, Zhengbing

doi:10.1016/j.cej.2015.02.072

Cited by 167 publications

(73 citation statements)

References 43 publications

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“…These results are in agreement with Fang et al [35] who found that TiO 2 supported manganese oxide prepared from nitrate precursor mainly consisted of MnO 2 . Similar double peaked TPR profiles were recorded for MnO x /TiO 2 catalyst calcined at 400 -500 °C [12,24], with an H 2 consumption corresponding to the reduction of a mixture of MnO 2 and Mn 2 O 3 .…”

Section: Basic Characterization Of Catalystssupporting

confidence: 93%

“…The characteristic temperatures for the main reduction events and the overall H 2 /Mn ratios, in the range 0.93 to 0.96 ± 0.03 (Table 1), confirm the large predominance of Mn 4+ species (as in MnO 2 ) with a smaller fraction (<15%) of Mn 3+ species (as in Mn 2 O 3 ), which are all finally reduced to Mn 2+ [34,35]. The temperature delay observed for H 2 consumption peaks for Mn/Z samples with respect to their Mn/T counterparts is possibly associated to the microporous structure of the ZSM5 support, or to a lower dispersion of manganese oxide [24].…”

Section: Basic Characterization Of Catalystsmentioning

confidence: 60%

“…With both supports the reduction process started at ca. 150°C and showed a characteristic two step feature [12,24,35], well evident for relatively high Mn loadings (above 10%), whilst the second peak appears as a shoulder for lower Mn contents.…”

Section: Basic Characterization Of Catalystsmentioning

confidence: 95%

See 2 more Smart Citations

Low temperature SCR on supported MnOx catalysts for marine exhaust gas cleaning: Effect of KCl poisoning

Cimino

Lisi

Tortorelli

2016

Chemical Engineering Journal

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Section: Basic Characterization Of Catalystssupporting

confidence: 93%

Section: Basic Characterization Of Catalystsmentioning

confidence: 60%

See 1 more Smart Citation

Low temperature SCR on supported MnOx catalysts for marine exhaust gas cleaning: Effect of KCl poisoning

Cimino

Lisi

Tortorelli

2016

Chemical Engineering Journal

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“…It has been mentioned that the low temperature peaks are on account of highly dispersed metal oxide particles on the supports and the second reduction peak is typically assigned to the hydrogen consumed in the reaction with sub-surface lattice oxygen, which could migrate from the interior to the surface of the catalyst at higher temperatures [24]. [25]. Whereas each kind of MnO x favored its corresponding peaks, it was difficult to identify the MnO x species consistent with the TPR profiles, considering the investigated above.…”

Section: H 2 -Tpr Analysismentioning

confidence: 99%

Synthesis of TiO2 with diverse morphologies as supports of manganese catalysts for CO oxidation

et al. 2015

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The catalytic CO oxidation reaction has been investigated over a series of Mn/TiO 2 catalysts. The titanium dioxides, including several mesoporous structures were prepared by different synthesis procedures. The mesoporous TiO 2 synthesized using evaporation-induced self-assembly (EISA) method exhibited the highest surface area (217.14 m 2 /g). The successful loading of the active manganese component (2 %) to TiO 2 supports showed high dispersion of MnO x species in amorphous state. Characterizations of XRD, N 2 adsorption-desorption, pore size distributions, TEM, H 2 -TPR and XPS were applied to contrast their structure properties and correlated with the corresponding catalytic performance. The Mn/EISA exhibited the highest catalytic activity among the series of Mn/TiO 2 catalysts, which could completely oxidize CO into CO 2 at temperature as low as 270 o C, due to its highly ordered mesoporous channels, which effectively enlarge the surface area leading to promoting a strong interaction between MnO x species (68 % Mn 3?) and TiO 2 support.

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“…As power plants are mainly responsible for the excessive NOx emissions, appropriate measures should be taken to reduce them. SCR or NH 3 -SCR (Selective catalytic reduction of NOx with NH 3 ) is the most popular method to solve excessive NOx emissions problem [3] [4].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on NH3-SCR Performance of Mn-Ce/TiO2 Catalyst

Xu¹,

Wang²,

Yang³

et al. 2016

Proceedings of the 2015 2nd International Conference on Machinery, Materials Engineering, Chemical Engineering and Biotechnolog

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Abstract. NO X pollutions affect our social manufacture and human being living, which has caused the extensive attention. NH 3 -SCR (selective catalytic reduction) has been largely studied to reduce NO X pollution. Most people focus on catalysts under N 2 and inert gases atmosphere, while few people research on the study of CO 2 as balance gas on oxy-fuel combustion condition. In this work, TiO 2 served as Mn-and Ce-support. The experiments were performed under CO 2 and N 2 atmosphere respectively. The results showed that CO 2 could inhibit NO conversion. The molar ratio of NH 3 to NO at 1.2:1 obtained a better NO conversion with Mn-Ce/TiO 2 catalyst.

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Identification of MnO species and Mn valence states in MnO /TiO2 catalysts for low temperature SCR

Cited by 167 publications

References 43 publications

Low temperature SCR on supported MnOx catalysts for marine exhaust gas cleaning: Effect of KCl poisoning

Low temperature SCR on supported MnOx catalysts for marine exhaust gas cleaning: Effect of KCl poisoning

Synthesis of TiO2 with diverse morphologies as supports of manganese catalysts for CO oxidation

Experimental Research on NH3-SCR Performance of Mn-Ce/TiO2 Catalyst

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