Low temperature NH3-SCR of NO over an unexpected Mn-based catalyst: Promotional effect of Mg doping

Fang, De; He, Feng; Liu, Xiaoqing; Qi, Kai; Xie, Jun; Li, Fengxiang; Yu, Chongqinq

doi:10.1016/j.apsusc.2017.08.088

Cited by 64 publications

(14 citation statements)

References 59 publications

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“…Given that the dispersion of two active components on support enhances the active sites further, researchers have been widely reported the supported binary transition metal-based oxides to improve the performance and SO 2 /H 2 O tolerance in NH 3 -SCR reaction. With this perspective, several composites, such as MnCe/CNTs [118], Mn-Fe/TiO 2 [119], MnO x -CeO 2 /graphene [120], Mg-MnO x /TiO 2 [121], CeO x -MnO x /TiO 2 -graphene [122], Fe-Mn/Al 2 O 3 [123], Mn-Fe/W-Ti [124], MnO x -CeO 2 /TiO 2 -1%NG (NG = N-doped grapheme) [125], Mn-Ce/CeAPSO-34 [126], etc., were investigated for the NH 3 -SCR reaction at low-temperature. Smirniotis et al [22] studied the promotional effect of co-doped metals (Cr, Fe, Co, Ni, Cu, Zn, Ce, and Zr) on the NH 3 -SCR performance of Mn/TiO 2 .…”

Section: Supported Binary and Multi Transition Metal-based Catalystsmentioning

confidence: 99%

A Review of Low Temperature NH3-SCR for Removal of NOx

et al. 2019

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The importance of the low-temperature selective catalytic reduction (LT-SCR) of NOx by NH3 is increasing due to the recent severe pollution regulations being imposed around the world. Supported and mixed transition metal oxides have been widely investigated for LT-SCR technology. However, these catalytic materials have some drawbacks, especially in terms of catalyst poisoning by H2O or/and SO2. Hence, the development of catalysts for the LT-SCR process is still under active investigation throughout seeking better performance. Extensive research efforts have been made to develop new advanced materials for this technology. This article critically reviews the recent research progress on supported transition and mixed transition metal oxide catalysts for the LT-SCR reaction. The review covered the description of the influence of operating conditions and promoters on the LT-SCR performance. The reaction mechanism, reaction intermediates, and active sites are also discussed in detail using isotopic labelling and in situ FT-IR studies.

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Section: Supported Binary and Multi Transition Metal-based Catalystsmentioning

confidence: 99%

A Review of Low Temperature NH3-SCR for Removal of NOx

et al. 2019

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“…The peaks observed at 361°C could be ascribed to the reduction of MnO 2 to Mn 2 O 3 , and those observed at 480°C represented the combined reduction of Mn 2 O 3 to Mn 3 O 4 and of Eu 2 O 3 to EuO. [52] For the MnÀ EuÀ Fe(1)-y catalysts, the reduction peaks moved to lower temperatures than those observed for the MnÀ Eu-550 catalyst. It is widely accepted that lower reduction temperatures denoted to stronger redox properties.…”

Section: Resultsmentioning

confidence: 80%

Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR

et al. 2019

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Novel MnÀ EuÀ Fe catalysts were prepared via co-precipitation method for NO x removal by selective catalytic reduction with NH 3 (NH 3 À SCR). The MnÀ EuÀ Fe(1)-500 catalyst possessed the highest level of low-temperature activity, giving 98 % NO conversion at 100°C. This catalyst also exhibited excellent H 2 O resistance capacity, even at a high gas hourly space velocity (GHSV) of 75,000 h À 1 . The NO conversion still maintained at approximately 90 % in the presence of 15 % H 2 O at 230°C after 50 h, and the adverse effects of H 2 O could be quickly eliminated after the removal of H 2 O. Detailed characterization and analysis indicated that strong interactions among Mn, Eu and Fe resulted in the excellent low-temperature SCR activity and H 2 O resistance of the MnÀ EuÀ Fe(1)-500 catalyst. The strong interactions lead to larger specific surface area, higher concentrations of Mn 4 + , Fe 3 + and O α ; improved redox properties, increased acid sites and acid strength, and more adsorption amounts of NO/NH 3 in the presence of H 2 O. The MnÀ EuÀ Fe(1)-500 catalyst is a potential future catalyst for low-temperature NO x removal derived from high-H 2 O-content flue gases of natural gas combustion.

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“…After doping metal oxides, two bigger and broader peaks appeared at medium and high temperature ranges were observed in modified BACs, revealing that loading Mn or La species could contribute to more surface acid sites. In which medium temperature peaks were in line with Brønsted acid sites, whilst high temperature peaks belonged to Lewis acid sites (Lónyi et al, 1996;Gu et al, 2010;Fang et al, 2018). It was conjectured that Brønsted acid sites might be stemmed from surface hydroxyl groups (Gu et al, 2010;Ma et al, 2015b), while Lewis acid sites possibly originated from unsaturated metal sites (Gu et al, 2010;Zhu et al, 2017).…”

Section: Nh3-tpd Analysismentioning

confidence: 99%

LaOx modified MnOx loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg0

Xie

et al. 2021

Environ Sci Pollut Res

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A battery of agricultural straw derived biomass activated carbons supported LaOx modified MnOx (LaMn/BACs) was prepared by a facile impregnation method and then tested for the efficiency of simultaneous abatement of NO and Hg 0 . 15%LaMn/BAC manifested excellent removal efficiency of Hg 0 (100%) and NO (86.7%) at 180 °C, which also exhibited splendid resistance to SO2 and H2O. The interaction between Hg 0 removal and NO removal was explored, thereinto Hg 0 removal had no influence on NO removal, while NO removal preponderated over Hg 0 removal. The inhibitory effect of NH3 was greater than the accelerative effect of NO and O2 on Hg 0 removal. The physicochemical characterization of related samples were characterized by SEM, XRD, BET, H2-TPR, NH3-TPD and XPS. After incorporating suitable LaOx into 15%Mn/BAC, the synergistic effect between LaOx and MnOx contributed to the improvement of BET surface area and total pore volume, the promotion of redox ability, surface active oxygen species and acid sites, inhibiting the crystallization of MnOx. 15%LaMn/BAC has the best catalytic oxidation activity at low temperature. That might be answerable for superior performance and preferable tolerance to SO2 and H2O. Finally, the principle of catalytic oxidation was also discussesed in this article.

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Low temperature NH3-SCR of NO over an unexpected Mn-based catalyst: Promotional effect of Mg doping

Cited by 64 publications

References 59 publications

A Review of Low Temperature NH3-SCR for Removal of NOx

A Review of Low Temperature NH3-SCR for Removal of NOx

Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR

LaOx modified MnOx loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg0

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Low temperature NH3-SCR of NO over an unexpected Mn-based catalyst: Promotional effect of Mg doping

Cited by 64 publications

References 59 publications

A Review of Low Temperature NH3-SCR for Removal of NOx

A Review of Low Temperature NH3-SCR for Removal of NOx

Improved Low‐Temperature Activity and H2O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH3−SCR

LaOx modified MnOx loaded biomass activated carbon and its enhanced performance for simultaneous abatement of NO and Hg0

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Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR