Low-temperature selective catalytic reduction of NO with NH3 over ordered mesoporous MnxCo3−xO4 catalyst

Qiu, Mingying; Zhan, Sihui; H, Yu; Zhu, Dandan

doi:10.1016/j.catcom.2015.01.022

Cited by 60 publications

(29 citation statements)

References 21 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The three transition metal cobaltite catalysts were synthesized by the nanocasting method using KIT‐6 as a hard template . The template KIT‐6 was prepared by the following method described by Qiu et al All the precursors used for the catalyst synthesis were of analytical grade. In this classical method, 1.0 g KIT‐6 was suspended in 70 mL n ‐hexane, stirred for 3 h, then mixed in a 1.0 mL aqueous solution containing 2.3 mmol Mn(NO 3 ) 2 · 4H 2 O and 4.6 mmol of Co(NO 3 ) 2 · 4H 2 O under vigorous stirring overnight.…”

Section: Methodsmentioning

confidence: 99%

Transition metals cobaltites spinel for depollution of NO_x emissions using SCR technology

et al. 2017

View full text Add to dashboard Cite

The catalytic performances of various transition metal (M = Cu, Mn, and Ni) cobaltites prepared by the nanocasting method were investigated for the selective catalytic reduction (SCR) of NO under lean burn conditions. KIT‐6 was used as a hard template in the nanocasting method for preparation of catalysts. The catalyst samples were characterized by various techniques such as XRD, low‐temperature N2 physisorption, SEM‐EDS, and XPS. The catalysts were examined for the SCR of NO by NH3 and H2‐LPG in a packed bed tubular flow reactor under the following reaction conditions: 500 ppm NO, 8 % O2, (0.1 % NH3) or (1000 ppm LPG, 1 % H2) in Ar with 200 mg catalyst. The inlet and outlet gases of the reactor were analyzed by an Eco Physics CLD 62 chemiluminescence NO/NOx analyzer and online GC. NO and NO2 measurements were done by an Eco Physics CLD 62 chemiluminescence NO/NOx analyzer. Two separate GCs equipped with Porapak Q/capillary columns and FID/ECD detectors were used to analyze the hydrocarbons/−N2O respectively. The addition of 1 % H2 with LPG promoted NO reduction at a remarkably low temperature. It was found that the nature of the dispersed metal strongly affects the light‐off temperature (52 °C) and enhances NO conversion. The oxygen‐deficient MnCo2O4 spinel structure enhanced NO reduction (87.1 %) at a lower temperature of 250 °C as compared to Cu and Ni cobaltites using H2‐LPG‐SCR. The H2‐LPG reductant showed the best de‐NOx activity and the order of catalyst activity followed the sequence: MnCo2O4 > CuCo2O4 > NiCo2O4.

show abstract

Section: Methodsmentioning

confidence: 99%

Transition metals cobaltites spinel for depollution of NO_x emissions using SCR technology

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Among the metal elements, cerium [24,25], chromium [10], iron [27,28,76], cobalt [29,30], copper [52], nickel [77], and several other elements have drawn the most attention as the mixture or dopant to construct binary metal oxide catalysts with MnOx. CeO2 has been studied extensively due to its good characteristics, such as increasing surface acidity after SO2 poisoning [78,79], high surface area [80,81], good dispersion of MnOx on the surface [45], and the redox shift between Ce 4+ …”

Section: 21mn-based Binary Metal Oxide Catalystsmentioning

confidence: 99%

“…Zhang et al [29] found that the MnxCo3-xO4 nanocage catalyst exhibited decent SO2 tolerance due to its hierarchically porous structure, abundant active sites, and strong interaction between Mn and Co oxides ( Figure 9). Qiu et al prepared a mesoporous 3D-MnCo2O4 catalyst, which exhibited great SCR activity and good tolerance to sulfur and water [30,31]. As illustrated in Figure 10, the NO conversion over MnCo2O4 was maintained at 86% in the presence of 5 vol% H2O and 100 ppm SO2.…”

Section: Mn-based Binary Metal Oxide Catalystsmentioning

confidence: 99%

“…Zhang et al [28] found that an Mn x Co 3−x O 4 catalyst with a nanocage structure exhibited much better SO 2 and H 2 O tolerance than Mn x Co 3−x O 4 without a nanocage structure. Qiu et al synthesized a mesoporous 3D-MnCo 2 O 4 catalyst that exhibited great SCR activity and good tolerance to sulfur and water [30,31], and the mesoporous structure enabled a dynamic balance between the formation and decomposition of ammonium sulfate, and thus suppressed the blocking effect during the SCR reaction. Li et al prepared Mn 2 O 3 -doped Fe 2 O 3 hexagonal microsheet catalyst [102] and found the single H 2 O resistance (15%) and the single SO 2 resistance (100 ppm) over this catalyst were good and stable with the NO conversion at around 92% and 85% for 100 h, respectively, because of this special structure.…”

Section: Rational Design Of Structure and Morphologymentioning

confidence: 99%

See 1 more Smart Citation

Sulfur and Water Resistance of Mn-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

et al. 2018

View full text Add to dashboard Cite

Selective catalytic reduction (SCR) with NH 3 is the most efficient and economic flue gas denitrification technology developed to date. Due to its high low-temperature catalytic activity, Mn-based catalysts present a great prospect for application in SCR de-NO x at low temperatures. However, overcoming the poor resistance of Mn-based catalysts to H 2 O and SO 2 poison is still a challenge. This paper reviews the recent progress on the H 2 O and SO 2 resistance of Mn-based catalysts for the low-temperature SCR of NO x . Firstly, the poison mechanisms of H 2 O and SO 2 are introduced in detail, respectively. Secondly, Mn-based catalysts are divided into three categories-single MnO x catalysts, Mn-based multi-metal oxide catalysts, and Mn-based supported catalysts-to review the research progress of Mn-based catalysts for H 2 O and SO 2 resistance. Thirdly, several strategies to reduce the poisonous effects of H 2 O and SO 2 , such as metal modification, proper support, the combination of metal modification and support, the rational design of structure and morphology, are summarized. Finally, perspectives and future directions of Mn-based catalysts for the low-temperature SCR of NO x are proposed.

show abstract

“…[24][25][26][27] Excellent H 2 O tolerance levels and high thermal stability have been obtained in novel MnFeO x nanorods and Mn 2 O 3 -doped Fe 2 O 3 hexagonal microsheet catalysts. The catalytic performance and H 2 O resistance of modified Mn-based catalysts by Fe, Ce, Co and Ni have shown a certain degree of improvement.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

View full text Add to dashboard Cite

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.

show abstract

Low-temperature selective catalytic reduction of NO with NH3 over ordered mesoporous MnxCo3−xO4 catalyst

Cited by 60 publications

References 21 publications

Transition metals cobaltites spinel for depollution of NO_x emissions using SCR technology

Transition metals cobaltites spinel for depollution of NO_x emissions using SCR technology

Sulfur and Water Resistance of Mn-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

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

Contact Info

Product

Resources

About

Low-temperature selective catalytic reduction of NO with NH3 over ordered mesoporous MnxCo3−xO4 catalyst

Cited by 60 publications

References 21 publications

Transition metals cobaltites spinel for depollution of NOx emissions using SCR technology

Transition metals cobaltites spinel for depollution of NOx emissions using SCR technology

Sulfur and Water Resistance of Mn-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

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

Contact Info

Product

Resources

About

Transition metals cobaltites spinel for depollution of NO_x emissions using SCR technology

Transition metals cobaltites spinel for depollution of NO_x emissions using SCR technology

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