Enhancing DeNOx performance of CoMnAl mixed metal oxides in low-temperature NH3-SCR by optimizing layered double hydroxides (LDHs) precursor template

Wu, Xu; Feng, Yalin; Du, Yali; Liu, Xuezhen; Zou, Chunlei; Li, Zhe

doi:10.1016/j.apsusc.2018.10.191

Cited by 82 publications

(15 citation statements)

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“…Although the Ni0.7Co0.3Mn2Ox catalyst exhibited good resistance to H2O, it had poor SO2 tolerance which needs to be improved. Wu and co-workers [91] compared the DeNOx performance of MnO2/CoAl-LDO and CoMnAl-LDO mixed metal oxides prepared from CoAl-MnO2-LDH and CoMnAl-LDH templates by ion-exchange/redox reaction and hexamethylenetetramine (HMT) hydrolysis methods, respectively. The CoAl-MnO2-LDH showed higher NH3-SCR activity in a broad temperature window of 90-300 °C (Figure 8a) as well as better stability and SO2/H2O resistance (Figure 8b) than the CoMnAl-LDO, which was attributed to its larger specific surface area, stronger redox ability, more quantitative acid sites, and abundant active components.…”

Section: Ternary and Multi-transition Metal-based Catalystsmentioning

confidence: 99%

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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: Ternary and Multi-transition Metal-based Catalystsmentioning

confidence: 99%

“…Reaction conditions: [NH3] = 600 ppm, [NO] = 600 ppm, [O2] = 5 vol%, 100 ppm SO2 (when used), 10 vol% H2O. (when used) balanced by N2.Reprinted from Reference[91]. Copyright 2019, with Permission from Elsevier.…”

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confidence: 99%

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

et al. 2019

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“…Lewis acid sites have good stability and can work at a wide range of temperatures. 41 In addition, we found that the desorption peak of Mn 6 Zr 1 catalyst was shifted toward the low-temperature region and contained Brønsted acid sites and Lewis acid sites. This indicated that the addition of zirconium changes the properties of MnO x acid sites.…”

Section: Resultsmentioning

confidence: 79%

Selective catalytic reduction of NO_x by low-temperature NH₃ over Mn_xZr₁ mixed-oxide catalysts

Zhang

et al. 2022

RSC Adv.

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“…Among all samples, Mn-Ce-Co 0.05 /Ti-C,N possesses more abundant Co 3+ (43%), which is in good agreement with the obvious enhancement of catalytic activity. 39,40 In Fig. 4(D), all the O 1s spectra could be well fitted into three characteristic peaks: lattice oxygen (O ⊎ , 529.1-529.3 eV), surface oxygen species (O ⊍ , 530.7-530.9 eV)-like chemisorbed oxygen or weakly boned oxygen species, and acid radical and/or hydroxyl species (O γ , 531.8-5321 eV).…”

Section: Xps Analysismentioning

confidence: 89%

C,N‐modified TiO₂‐supported Mn–Ce–Co_x‐based catalyst for low‐temperature NH₃‐SCR

Liu

Sun

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: The emission of NO x can causes serious environmental pollution and endangers human health. In recent years, the selective catalytic reduction of NO with NH 3 (NH 3 -SCR) technology has been widely studied and adopted to reduce the production and emissions of NO x during many technologies.RESULTS: A series of Mn-Ce-Co x /Ti-C,N catalysts were prepared by the impregnation method, and low-temperature NH 3 -SCR was studied. The results show that support modification (Ti-C,N) can broaden the operation temperature window of the catalyst (NO conversion >95%: Mn-Ce/TiO 2 catalyst, 160-320 °C; Mn-Ce/Ti-C,N catalyst, 140-320 °C). The doping of Co further improves the low-temperature NH 3 -SCR of the catalyst. When n(Co):n(Ti) = 0.05, the catalyst has the best catalytic performance with the NO conversion reaches 100% at 100 °C.CONCLUSION: Temperature-programmed reduction (H 2 -TPR) and temperature-programmed desorption (NH 3 -TPD) results showed that Ti-C,N can improve the redox ability but reduces the surface acidity. Co-doping has no effect on surface acidity, but the redox ability is further improved. A suitable amount of Co-doping is beneficial to the optimal catalytic activity of Mn-Ce-Co 0.05 /Ti-C,N catalyst. This suggests a balance between redox properties and surface acidity. Especially for the strong redox ability, it can promote the oxidation of NO to NO 2 , and promote low-temperature NH 3 -SCR through the 'fast SCR' pathway. X-ray photoelectron spectroscopy results of the highest chemisorbed oxygen (O ⊍ ) concentration and relative atomic ratio (Mn 4+ /Mn n+ , Ce 3+ /Ce n+ and Co 3+ /Co n+ ) confirmed the above conclusion. Both the Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) mechanisms occurred in the NH 3 -SCR reaction over the Mn-Ce-Co 0.05 /Ti-C,N catalyst.

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Enhancing DeNOx performance of CoMnAl mixed metal oxides in low-temperature NH3-SCR by optimizing layered double hydroxides (LDHs) precursor template

Cited by 82 publications

References 50 publications

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

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

Selective catalytic reduction of NO_x by low-temperature NH₃ over Mn_xZr₁ mixed-oxide catalysts

C,N‐modified TiO₂‐supported Mn–Ce–Co_x‐based catalyst for low‐temperature NH₃‐SCR

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Enhancing DeNOx performance of CoMnAl mixed metal oxides in low-temperature NH3-SCR by optimizing layered double hydroxides (LDHs) precursor template

Cited by 82 publications

References 50 publications

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

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

Selective catalytic reduction of NOx by low-temperature NH3 over MnxZr1 mixed-oxide catalysts

C,N‐modified TiO2‐supported Mn–Ce–Cox‐based catalyst for low‐temperature NH3‐SCR

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Selective catalytic reduction of NO_x by low-temperature NH₃ over Mn_xZr₁ mixed-oxide catalysts

C,N‐modified TiO₂‐supported Mn–Ce–Co_x‐based catalyst for low‐temperature NH₃‐SCR