Modification of CrCeOx with Mo: improved SO2 resistance and N2 selectivity for NH3-SCR at medium–low temperatures

Yun, Junge; Tong, Zhangfa; Hu, Xuehai; Zhao, Cheng; Cheng-xian, Liu; Chen, Dingsheng; Zhang, Hanbing; Chen, Zhihang

doi:10.1039/d2cy00679k

Cited by 10 publications

(4 citation statements)

References 56 publications

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“…The amounts of MoO 3 were commonly above 5% when it was used as an acidic dopant. 61 In this work, the doping amount of Mo was only 0.5 wt %, and the surface acidity was barely influenced. In addition, the H 2 O promotion effect was suppressed by MoO 3 for Pt-0.5Mo/Ti, which may be the main reason for its poor performance.…”

Section: Resultsmentioning

confidence: 72%

“…According to the results of previous reports, , the presence of SO 2 and easy sulfation on the catalyst surface was believed to be the reason for the lower activity of Fe and Cu loaded on Pt/Ti than Pt/Ti. Commonly, the introduction of an acidic promoter such as MoO 3 or WO 3 into the catalyst enhances the sulfur resistance. , Doping an appropriate amount of MoO 3 can increase the surface acidity of the catalyst, thereby improving the antisulfur resistance of the catalyst. The amounts of MoO 3 were commonly above 5% when it was used as an acidic dopant .…”

Section: Resultsmentioning

confidence: 99%

“…Commonly, the introduction of an acidic promoter such as MoO 3 or WO 3 into the catalyst enhances the sulfur resistance. , Doping an appropriate amount of MoO 3 can increase the surface acidity of the catalyst, thereby improving the antisulfur resistance of the catalyst. The amounts of MoO 3 were commonly above 5% when it was used as an acidic dopant . In this work, the doping amount of Mo was only 0.5 wt %, and the surface acidity was barely influenced.…”

Section: Resultsmentioning

confidence: 99%

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Ultralow Doping of Mn Species into Pt Catalyst Enhances the CO Oxidation Performance in the Presence of H₂O and SO₂

Liu,

Zou,

et al. 2023

ACS Catal.

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Bimetallic catalysts Pt–M/Ti were prepared by introducing various dopants (M = Mn, Fe, Co, Cu, Ce, Mo) into Pt/Ti with ultralow loadings (0.5 wt % M) and compared in CO oxidation in the presence of H2O and SO2. Among these catalysts, Pt–0.5Mn/Ti contributed the highest oxidation efficiency and strongest sulfur resistance. Further improvement of Mn contents led to the decrease of CO conversion. It was indicated that the introduction of appropriate Mn species enhanced the active oxygen supplying ability of the catalyst, thus improving the reaction activity. The CO oxidation performance of the catalyst was improved through the reaction between *OH from H2O dissociation and CO. The deposition of S on the Pt–0.5Mn/Ti surface did not increase with time extension. Theoretical calculation results revealed that cleavage of S–O–Mn species could be facilitated by Pt, and the SO2 adsorption energy calculations demonstrated that SO2 was more easily adsorbed on Pt/Ti than Pt–0.5Mn/Ti, which was very consistent with its sulfur resistance. In situ DRIFT studies at 260 °C revealed that the introduction of SO2 onto Pt–0.5Mn/Ti showed little change for CO adsorption on different Pt species, while Pt/Ti showed an apparent decrease of Pt0–CO. 18O isotopic experiments in the presence of H2 18O and SO2 were systematically designed to accurately quantify the CO2 composition including C16O16O, C16O18O, and C18O18O. Accordingly, the reaction mechanism for Pt–0.5Mn/Ti catalyzed CO oxidation consisting of four pathways was proposed.

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Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Ultralow Doping of Mn Species into Pt Catalyst Enhances the CO Oxidation Performance in the Presence of H₂O and SO₂

Liu,

Zou,

et al. 2023

ACS Catal.

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“…The two additional peaks observed at 740 and 839 °C can be ascribed to the reduction of MoO x . Note that the overlap of the new reduction peak appeared at approximately 465 °C, which was likely because of the strong interaction between Mo and Mn within the catalyst that caused part of MoO 3 to have similar reduction temperatures with MnO x . − …”

Section: Resultsmentioning

confidence: 99%

A Novel MnO_x–MoO_x Codoped Iron-Based Catalyst for NH₃-SCR with Superior Catalytic Activity over a Wide Temperature Range

Zhang,

et al. 2024

Ind. Eng. Chem. Res.

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MnO x and MoO x , as additives, have proved effective in enhancing the NH 3 selective catalytic reduction activity of catalysts. In this study, a new Mn−Fe−Mo catalyst was prepared using both the precipitation method and impregnation method. The redox properties, surface acidity, and reaction intermediates of the prepared catalysts were analyzed using various techniques. The test results showed that the MFMo 4 catalyst achieved a NO x conversion rate exceeding 90% over the temperature range of 120−390 °C, demonstrating high potential to replace V-based catalysts due to outstanding activity at both high and low temperatures. The addition of MoO x exerted a detrimental impact on the redox property and avoided the production of N 2 O, thereby enhancing the N 2 selectivity. Furthermore, the codoping of MnO x and MoO x inhibited the adsorption of NO x on the catalysts while resulting in an increased number of Lewis acid sites on the catalyst. This promoted its reaction via the Eley−Rideal mechanism, which played a crucial role in ensuring the catalyst had excellent SCR activity over a wide temperature range.

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Against catalyst deactivation during toluene oxidation on CuCeOx in flue gas: High oxidation efficiency and rapid oxidation pathway

Guo,

Lin,

Tang

et al. 2024

Journal of Environmental Chemical Engineering

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Modification of CrCeO_x with Mo: improved SO₂ resistance and N₂ selectivity for NH₃-SCR at medium–low temperatures

Abstract: Medium and low temperature NH3-SCR is an effective method for the nitrogen oxides (NOx) removal in industrial furnaces. The chromium (Cr) and cerium (Ce) based catalysts perform excellent NH3-SCR potential...

Cited by 10 publications

References 56 publications

Ultralow Doping of Mn Species into Pt Catalyst Enhances the CO Oxidation Performance in the Presence of H₂O and SO₂

Ultralow Doping of Mn Species into Pt Catalyst Enhances the CO Oxidation Performance in the Presence of H₂O and SO₂

A Novel MnO_x–MoO_x Codoped Iron-Based Catalyst for NH₃-SCR with Superior Catalytic Activity over a Wide Temperature Range

Against catalyst deactivation during toluene oxidation on CuCeOx in flue gas: High oxidation efficiency and rapid oxidation pathway

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Modification of CrCeOx with Mo: improved SO2 resistance and N2 selectivity for NH3-SCR at medium–low temperatures

Abstract: Medium and low temperature NH3-SCR is an effective method for the nitrogen oxides (NOx) removal in industrial furnaces. The chromium (Cr) and cerium (Ce) based catalysts perform excellent NH3-SCR potential...

Cited by 10 publications

References 56 publications

Ultralow Doping of Mn Species into Pt Catalyst Enhances the CO Oxidation Performance in the Presence of H2O and SO2

Ultralow Doping of Mn Species into Pt Catalyst Enhances the CO Oxidation Performance in the Presence of H2O and SO2

A Novel MnOx–MoOx Codoped Iron-Based Catalyst for NH3-SCR with Superior Catalytic Activity over a Wide Temperature Range

Against catalyst deactivation during toluene oxidation on CuCeOx in flue gas: High oxidation efficiency and rapid oxidation pathway

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Resources

About

Modification of CrCeO_x with Mo: improved SO₂ resistance and N₂ selectivity for NH₃-SCR at medium–low temperatures

Ultralow Doping of Mn Species into Pt Catalyst Enhances the CO Oxidation Performance in the Presence of H₂O and SO₂

Ultralow Doping of Mn Species into Pt Catalyst Enhances the CO Oxidation Performance in the Presence of H₂O and SO₂

A Novel MnO_x–MoO_x Codoped Iron-Based Catalyst for NH₃-SCR with Superior Catalytic Activity over a Wide Temperature Range