The role of the Cu dopant on a Mn3O4 spinel SCR catalyst: Improvement of low-temperature activity and sulfur resistance

Xiong, Shangchao; Peng, Yue; Wang, Dong; Huang, Nan; Zhang, Qinfang; Yang, Shijian; Chen, Jianjun; Li, Junhua

doi:10.1016/j.cej.2020.124090

Cited by 145 publications

(62 citation statements)

References 55 publications

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“…3,4 Traditional commercial vanadium-titanium catalysts have been used in various industrial elds due to their stability and high efficiency, but industrial application is still restrained by their inevitable drawbacks, including high operation temperature window, poisoning and deactivation of catalyst by deposited alkaline metal, and vanadium poisoning. [5][6][7] Therefore, it is necessary to develop NH 3 -SCR catalysts with excellent denitration activity in low temperature ranges.…”

Section: Introductionmentioning

confidence: 99%

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO₂–ZrO₂ catalyst for a low temperature NH₃-SCR system

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO₂–ZrO₂ catalyst for a low temperature NH₃-SCR system

et al. 2022

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“…XPS fitting indicated the dominance of Mn(III) and Mn(II) at the catalyst surface and, hence, Mn 3 O 4 and amorphous MnO X species are considered significant to the SCR mechanism. Non‐stoichiometric hausmannite is known to adsorb NH 3 coordinatively to its local octahedral Mn(III) 2 O 3 environment, whereas the tetrahedral Mn(II)O environment tends to form hydroxyl groups (MnOOH) and subsequently NH 4 + ‐B 41,70 . Mn 3 O 4 catalysts typically follow the E‐R mechanism of SCR, 41 reducing NO 2 and to a lesser extent NO; however, mixed MnO X /FeO X catalysts often result in both E‐R and L‐H pathways coexisting 33 …”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterisation of monolithic PTFE‐modified MnO_X/FeO_X catalysts for selective catalytic reduction (SCR) of NO_X at low temperature

Dongen

Moura

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND Selective catalytic reduction (SCR) of NOX has been the most widely used technique for the reduction of NOX emissions from combustion flue gas. MnOX/FeOX based catalysts typically can attain high NOX conversion at low temperature but with inferior water vapor resistance. RESULTS A MnOX/FeOX catalyst was synthesized by the sonicated co‐precipitation method and then wash‐coated on ceramic cordierite monoliths to form a low pressure drop monolithic catalyst suitable for high flowrate flue gas treatment conditions. The catalyst achieved above 90% NO conversion at a gas hourly space velocity (GHSV) of 30 000 h−1 over a 125–225 °C temperature window under simulated industrial flue gas conditions. In the presence of up to 5% H2O vapor, comparable performance was retained for a reduced temperature window of ≥150 °C. In order to improve water resistance and LT‐SCR performance, an optimal 10% w/w polytetrafluoroethylene (PTFE) doped MnOX/FeOX catalyst was developed, which exhibited remarkably high performance of up to 98% NO conversion, with improved water resistance at up to 10% v/v H2O while retaining high performance from 100 °C. CONCLUSION Monolithic MnOX/FeOX catalyst incorporating PTFE significantly improved NO conversion and water vapour resistance due to the enhanced NH3 adsorption associated with Lewis acid sites and water repellent property. These findings will provide guidance for researchers in this field to adapt F‐based or similar additives into the making of high performance and high water resistance catalysts either to retrofit existing catalyst synthesis procedures or reinvent a novel catalyst in a scalable but economical way. © 2020 Society of Chemical Industry

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“…In addition to the above mentioned reflections, in the XRD patterns the features typical of metal oxide phases are found. It should be assumed that, as in previously presented papers [48,49], for the mixed oxide systems with a Cu/Mn molar ratio < 0.5 the Cu-doped Mn 3 O 4 phase with the tetragonal hausminnite structure is formed due to the Jahn-Teller distortion. Its high dispersion, as in the case of Mn 2 O 3 in the Mn10SiBEA sample, causes that no intense diffraction lines attributed to this phase are noticeable in the XRD pattern collected for Cu2Mn8SiBEA.…”

Section: Structural and Textural Properties Of The Cu-mn/bea Catalystsmentioning

confidence: 89%

Impact of Mn addition on catalytic performance of Cu/SiBEA materials in total oxidation of aromatic volatile organic compounds

Rokicińska

Majerska

Drozdek

et al. 2021

Applied Surface Science

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Dealuminated BEA zeolite (SiBEA) was chosen as a support of metal oxide(s) phase for catalytic combustion of volatile organic compounds (VOCs). Copper and/or manganese oxide(s) were deposited at various Cu/Mn molar ratios. Factors influencing the catalytic activity were found by chosen physicochemical methods, including XRD, XRF, lowtemperature N 2 adsorption, FT-IR, UV-Vis-DRS, STEM-EDX, XPS and H 2 -TPR. Depending on the chemical composition, CuO, (Cu x Mn 3-x ) 1-δ O 4 , Cu-doped Mn 3 O 4 or Mn 2 O 3 was formed as the dominant phase. The active phase particles were located mainly in the interparticle voids of the zeolite support. SiBEA gained Lewis acid sites after the introduction of the metal oxide phase, especially in the case of CuO deposition. The presence of copper in the catalytic system resulted in enhanced reducibility of the active phase, and in a consequence in high catalytic activity in the total oxidation of aromatic VOCs, which proceeds according to the Mars-van Krevelen mechanism. After the introduction of Mn, the co-existence of different valence forms was found due to the redox equilibrium: Cu 2+ + Mn 3+ = Cu + + Mn 4+ .

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The role of the Cu dopant on a Mn3O4 spinel SCR catalyst: Improvement of low-temperature activity and sulfur resistance

Cited by 145 publications

References 55 publications

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO₂–ZrO₂ catalyst for a low temperature NH₃-SCR system

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO₂–ZrO₂ catalyst for a low temperature NH₃-SCR system

Synthesis and characterisation of monolithic PTFE‐modified MnO_X/FeO_X catalysts for selective catalytic reduction (SCR) of NO_X at low temperature

Impact of Mn addition on catalytic performance of Cu/SiBEA materials in total oxidation of aromatic volatile organic compounds

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The role of the Cu dopant on a Mn3O4 spinel SCR catalyst: Improvement of low-temperature activity and sulfur resistance

Cited by 145 publications

References 55 publications

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO2–ZrO2 catalyst for a low temperature NH3-SCR system

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO2–ZrO2 catalyst for a low temperature NH3-SCR system

Synthesis and characterisation of monolithic PTFE‐modified MnOX/FeOX catalysts for selective catalytic reduction (SCR) of NOX at low temperature

Impact of Mn addition on catalytic performance of Cu/SiBEA materials in total oxidation of aromatic volatile organic compounds

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Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO₂–ZrO₂ catalyst for a low temperature NH₃-SCR system

Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO₂–ZrO₂ catalyst for a low temperature NH₃-SCR system

Synthesis and characterisation of monolithic PTFE‐modified MnO_X/FeO_X catalysts for selective catalytic reduction (SCR) of NO_X at low temperature