Excellent low temperature NH3-SCR activity over MnaCe0.3TiOx (a = 0.1–0.3) oxides: Influence of Mn addition

Leng, Xuesong; Zhang, Zhiping; Li, Yushi; Zhang, Tianrui; Ma, Shibo; Yuan, Fang; Niu, Xiaoyu; Zhu, Yujun

doi:10.1016/j.fuproc.2018.09.012

Cited by 79 publications

(36 citation statements)

References 71 publications

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“…The deconvolution of Mn 2p1/2 peak could obtain three peaks assigned to Mn 2+ (652.4 ± 0.2 eV), Mn 3+ (653.8 ± 0.3 eV), and Mn 4+ (654.9 eV ± 0.4), The Mn 2p3/2 could also be divided into three peaks ascribed to Mn 2+ (641.1 ± 0.2 eV), Mn 3+ (642.6 ± 0.3 eV), and Mn 4+ (644.1 ± 0.4 eV) [20,21]. The XPS spectra of Ce 3d in The two peaks, u and v , were attributed to Ce 3+ species, whereas another six peaks belonged to Ce 4+ species [14,38]. Two peaks, at~464.5 eV and~458.7 eV, were observed for the XPS spectra of Ti 2p, as shown in Figure 5c, which were attributed to Ti 2p3/2 and Ti 2p1/2, respectively, representing the characteristic Ti 4+ species [11,14].…”

Section: Catalystmentioning

confidence: 97%

“…To compare the intrinsic activity of the catalysts at different calcination temperatures, turnover frequency (TOF) was calculated using Equation (5) [14,35]. TOF represents the number of NO conversion at a single active site (Mn atom) per unit time; its value is a measure of the catalytic reaction rate on a catalyst.…”

Section: Catalytic Activity Measurementmentioning

confidence: 99%

“…The NH 3 -SCR process on the MCTO-600 catalyst follows both the Eley-Rideal (E-R) mechanism and the Langmuir-Hinshelwood (L-H) mechanism.In addition, the V-based catalysts have some inevitable disadvantages, such as the toxicity of VO x , a narrow operating temperature window (300-400 • C), and a low N 2 selectivity [6,14,15]. Therefore, it is of great practical importance to develop catalysts with high catalytic activity and good SO 2 resistance under low-temperature conditions (<200 • C).The MnO x -based catalysts have been considered as promising candidates for NO removal by the NH 3 -SCR method owing to their inherent environmentally benign nature and superior catalytic activity [13][14][15][16][17][18][19][20][21]. As an additive, CeO 2 can further enhance the catalytic activity of MnO x in the low temperature range because of its unique oxygen storage capacity and redox performance [22,23].…”

mentioning

confidence: 99%

“…In addition, the V-based catalysts have some inevitable disadvantages, such as the toxicity of VO x , a narrow operating temperature window (300-400 • C), and a low N 2 selectivity [6,14,15]. Therefore, it is of great practical importance to develop catalysts with high catalytic activity and good SO 2 resistance under low-temperature conditions (<200 • C).…”

mentioning

confidence: 99%

“…The MnO x -based catalysts have been considered as promising candidates for NO removal by the NH 3 -SCR method owing to their inherent environmentally benign nature and superior catalytic activity [13][14][15][16][17][18][19][20][21]. As an additive, CeO 2 can further enhance the catalytic activity of MnO x in the low temperature range because of its unique oxygen storage capacity and redox performance [22,23].…”

mentioning

confidence: 99%

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Preparation of Mesoporous Mn–Ce–Ti–O Aerogels by a One-Pot Sol–Gel Method for Selective Catalytic Reduction of NO with NH3

et al. 2020

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Novel Mn–Ce–Ti–O composite aerogels with large mesopore size were prepared via a one-pot sol–gel method by using propylene oxide as a network gel inducer and ethyl acetoacetate as a complexing agent. The effect of calcination temperature (400, 500, 600, and 700 °C) on the NH3–selective catalytic reduction (SCR) performance of the obtained Mn–Ce–Ti–O composite aerogels was investigated. The results show that the Mn–Ce–Ti–O catalyst calcined at 600 °C exhibits the highest NH3–SCR activity and lowest apparent activation energy due to its most abundant Lewis acid sites and best reducibility. The NO conversion of the MCTO-600 catalyst maintains 100% at 200 °C in the presence of 100 ppm SO2, showing the superior resistance to SO2 poisoning as compared with the MnOx–CeO2–TiO2 catalysts reported the literature. This should be mainly attributed to its large mesopore sizes with an average pore size of 32 nm and abundant Lewis acid sites. The former fact facilitates the decomposition of NH4HSO4, and the latter fact reduces vapor pressure of NH3. The NH3–SCR process on the MCTO-600 catalyst follows both the Eley–Rideal (E–R) mechanism and the Langmuir–Hinshelwood (L–H) mechanism.

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Section: Catalystmentioning

confidence: 97%

Section: Catalytic Activity Measurementmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Preparation of Mesoporous Mn–Ce–Ti–O Aerogels by a One-Pot Sol–Gel Method for Selective Catalytic Reduction of NO with NH3

et al. 2020

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Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

et al. 2020

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Selective catalytic reduction of NOx with NH3 (NH3−SCR) is one of the widely used process to abate NOx emission from both stationary and mobile sources. Recently, CeO2−TiO2 based NH3−SCR catalysts due to their excellent medium and high temperature activities, high N2 selectivity and environmentally friendly, have attracted much attention as great candidate to replace the commercial VOx−TiO2 based NH3−SCR catalysts. During the past years, extensive works have been done to achieve the industrial commercialization of CeO2−TiO2 based NH3−SCR catalyst. In this review, we summarize the recent studies on the mechanism, deactivation, preparation and modification of CeO2−TiO2 catalyst. The focus of this review is the modification strategies on improving the catalytic performance of CeO2−TiO2 catalyst. By comparing the effect of different modification strategies on the catalytic performance of CeO2−TiO2 catalyst, the perspectives and challenges of CeO2−TiO2 based catalyst for NH3−SCR of NOx are discussed.

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Denitrification Technology and The Catalysts: A Review and Recent Advances

Liu,

Zhang,

Chen

2024

ChemCatChem

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With the acceleration of industrialization and the increasing prominence of environmental pollution problems, the emission of nitrogen oxides (NOx) in the atmosphere has become a global concern. These emissions are not only hazardous to human health, but also one of the main factors leading to acid rain, photochemical smog and global climate change. Therefore, the development and implementation of efficient denitrification technologies are an important issue for environmental protection. The present review focuses on the research progress of the denitrification technology in the recent years, including the traditional denitrification methods and common technologies. At the same time, the advantages, limitations and application prospects of each method are analyzed. The mechanisms, influencing factors, advantages and disadvantages of the denitrification catalysts are also discussed. In addition, the future research trends and potential challenges of denitrification technology are discussed. It is expected that this review will provide useful references for promoting the development and application of denitrification technology, which may help researchers to choose high‐performance and cost‐effective methods.

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Excellent low temperature NH3-SCR activity over MnaCe0.3TiOx (a = 0.1–0.3) oxides: Influence of Mn addition

Cited by 79 publications

References 71 publications

Preparation of Mesoporous Mn–Ce–Ti–O Aerogels by a One-Pot Sol–Gel Method for Selective Catalytic Reduction of NO with NH3

Preparation of Mesoporous Mn–Ce–Ti–O Aerogels by a One-Pot Sol–Gel Method for Selective Catalytic Reduction of NO with NH3

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃

Denitrification Technology and The Catalysts: A Review and Recent Advances

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Excellent low temperature NH3-SCR activity over MnaCe0.3TiOx (a = 0.1–0.3) oxides: Influence of Mn addition

Cited by 79 publications

References 71 publications

Preparation of Mesoporous Mn–Ce–Ti–O Aerogels by a One-Pot Sol–Gel Method for Selective Catalytic Reduction of NO with NH3

Preparation of Mesoporous Mn–Ce–Ti–O Aerogels by a One-Pot Sol–Gel Method for Selective Catalytic Reduction of NO with NH3

Recent Progress of CeO2−TiO2 Based Catalysts for Selective Catalytic Reduction of NOx by NH3

Denitrification Technology and The Catalysts: A Review and Recent Advances

Contact Info

Product

Resources

About

Excellent low temperature NH3-SCR activity over MnaCe0.3TiOx (a = 0.1–0.3) oxides: Influence of Mn addition

Recent Progress of CeO₂−TiO₂ Based Catalysts for Selective Catalytic Reduction of NO_x by NH₃