The performance and reaction pathway of δ-MnO2/USY for catalytic oxidation of toluene in the presence of ozone at room temperature

Yang, Ruijie; Han, Pingping; Fan, Yingying; Guo, Zhongjie; Zhao, Qitong; Wang, Yan; Che, Sainan; Lin, Songxue; Zhu, Rongshu

doi:10.1016/j.chemosphere.2020.125864

Cited by 33 publications

(13 citation statements)

References 33 publications

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“…Besides, it can be observed that toluene can be rapidly activated into some intermediates after being adsorbed on the catalyst surface. It includes alcohol species represented by the band at 1154 cm –1 , phenolic species at 1265 cm –1 (1285 cm –1 ), as well as the bands at 1465, 1805, and 1930 cm –1 , which can be attributed to benzyl alcohol and maleic anhydride . Compared with single Mn catalysts, more alcohol species and phenolic species were formed on the surface of the Cu–Mn catalysts.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Generally, the detected signal values below 1154 cm −1 (1028, 1060, 1154 cm −1 ) are attributed to alkoxide species. 12 The bands at 1180 cm −1 (1679 cm −1 ) and at 1280 cm −1 belong to the vibrational peaks of benzaldehyde and phenolic species, respectively. 51,61 The band at 1321 cm −1 can be ascribed to benzyl alcohol.…”

Section: Acidic and Catalyticmentioning

confidence: 99%

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Tuning the Micro-coordination Environment of Al in Dealumination Y Zeolite to Enhance Electron Transfer at the Cu–Mn Oxides Interface for Highly Efficient Catalytic Ozonation of Toluene at Low Temperatures

Shao

Wei

et al. 2022

Environ. Sci. Technol.

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The development of stable, highly active, and inexpensive catalysts for the ozone catalytic oxidation of volatile organic compounds (VOCs) is challenging but of great significance. Herein, the micro-coordination environment of Al in commercial Y zeolite was regulated by a specific dealumination method and then the dealuminated Y zeolite was used as the support of Cu–Mn oxides. The optimized catalyst Cu–Mn/DY exhibited excellent performance with around 95% of toluene removal at 30 °C. Besides, the catalyst delivered satisfactory stability in both high-humidity conditions and long-term reactions, which is attributed to more active oxygen vacancies and acidic sites, especially the strong Lewis acid sites newly formed in the catalyst. The decrease in the electron cloud density around aluminum species enhanced electron transfer at the interface between Cu–Mn oxides. Moreover, extra-framework octahedrally coordinated Al in the support promoted the electronic metal–support interaction (EMSI). Compared with single Mn catalysts, the incorporation of the Cu component changed the degradation pathway of toluene. Benzoic acid, as the intermediate of toluene oxidation, can directly ring-open on Cu-doped catalysts rather than being further oxidized to other byproducts, which increased the rate of the catalytic reaction. This work provides a new insight and theoretical guidance into the rational design of efficient catalysts for the catalytic ozonation of VOCs.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Acidic and Catalyticmentioning

confidence: 99%

Tuning the Micro-coordination Environment of Al in Dealumination Y Zeolite to Enhance Electron Transfer at the Cu–Mn Oxides Interface for Highly Efficient Catalytic Ozonation of Toluene at Low Temperatures

Shao

Wei

et al. 2022

Environ. Sci. Technol.

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“…Among many catalysts, MnO 2 ‐based materials have been extensively studied in the catalyst degradation of VOCs due to their natural abundance, environmentally friendliness, low cost, and specific chemical/physical properties, including different crystal structures and suitable redox activity. Currently, the reported types of VOCs degraded by MnO 2 ‐based materials include benzene series (such as toluene, [ 166,217,226,430–438 ] benzene, [ 171,173,439–441 ] ethylbenzene, [ 442–444 ] and o ‐xylene [ 297,445–448 ] ), formaldehyde, [ 54,86,116,123,137,155,156,296,449–455 ] propane, [ 456 ] aerobic sulfide, [ 172 ] methyl mercaptan, [ 299,457 ] acetone, [ 458,459 ] etc. Among them, formaldehyde and benzene series are the most common VOC pollutants in the air that have been studied the most ( Table 3 ).…”

Section: Environmental Applicationsmentioning

confidence: 99%

“…[ 63 ] systematically studied the effect of morphology of MnO 2 on the removal of toluene, and found that the order of catalytic activity was α‐MnO 2 nanorod > α‐MnO 2 nanotube > Mn 2 O 3 nanoflower > α‐MnO 2 nanowire, which agreed well with the sequence of the oxygen species concentrations and low‐temperature reducibility. In recent years, many efforts have been made to improve the performance of MnO 2 ‐based catalyst for toluene or benzene oxidation, such as morphology control (hollow microspheres, [ 101 ] ordered mesoporous γ‐MnO 2 [ 446 ] ), doping engineering (Ti doping δ‐MnO 2 , [ 173 ] Ni doping α‐MnO 2 , [ 166 ] Sa doping todorokite‐type MnO 2 , [ 171 ] W doping MnO 2 [ 169 ] ), and combinations with other active substances (MnO 2 /LaMnO 3 perovskites, [ 228,231 ] MnO 2 /vertical graphene, [ 292 ] MnO 2 /graphene fin foam, [ 293 ] δ‐MnO 2 /CuO, [ 219 ] MnO 2 /Al 2 O 3 , [ 226 ] LaMnO 3 /δ‐MnO 2 , [ 467 ] Pt/MnO 2 , [ 302,430 ] Au/three‐dimensionally ordered mesoporous β‐MnO 2 , [ 117 ] Ag/α‐MnO 2 , [ 468 ] MnO 2 –TiO 2 /zeolite, [ 469 ] TiO 2 /MnO 2 , [ 196 ] MnO 2 /ZSM‐5, [ 441 ] MnO 2 /SmMnO 3 , [ 229 ] hierarchical C@MnO 2 sponge, [ 326 ] MnO 2 /Co 3 O 4 , [ 217 ] Pt/MnO 2 @Mn 3 O 4 , [ 320 ] MnO 2 /CeO 2 , [ 206 ] and δ‐MnO 2 /ultrastable Y zeolite [ 437 ] ).…”

Section: Environmental Applicationsmentioning

confidence: 99%

MnO₂‐Based Materials for Environmental Applications

et al. 2021

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Manganese dioxide (MnO2) is a promising photo–thermo–electric‐responsive semiconductor material for environmental applications, owing to its various favorable properties. However, the unsatisfactory environmental purification efficiency of this material has limited its further applications. Fortunately, in the last few years, significant efforts have been undertaken for improving the environmental purification efficiency of this material and understanding its underlying mechanism. Here, the aim is to summarize the recent experimental and computational research progress in the modification of MnO2 single species by morphology control, structure construction, facet engineering, and element doping. Moreover, the design and fabrication of MnO2‐based composites via the construction of homojunctions and MnO2/semiconductor/conductor binary/ternary heterojunctions is discussed. Their applications in environmental purification systems, either as an adsorbent material for removing heavy metals, dyes, and microwave (MW) pollution, or as a thermal catalyst, photocatalyst, and electrocatalyst for the degradation of pollutants (water and gas, organic and inorganic) are also highlighted. Finally, the research gaps are summarized and a perspective on the challenges and the direction of future research in nanostructured MnO2‐based materials in the field of environmental applications is presented. Therefore, basic guidance for rational design and fabrication of high‐efficiency MnO2‐based materials for comprehensive environmental applications is provided.

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“…Among VOCs, toluene and acetone were chosen as model compounds due to their abundance in the indoor environment and their different chemical structures. − Acetone and toluene are common solvents in the pharmaceutical industry . The catalytic ozonation of acetone and toluene as a single compound over various catalysts has been widely studied in the literature. − However, few reports are available on catalytic ozonation of mixture systems over a range of concentrations. The objective of this study is to investigate the ozonation of single acetone and toluene and their mixture with different acetone/toluene concentrations at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Catalytic Ozonation of Acetone and Toluene in Air Using MnO_x/Al₂O₃ Catalysts at Room Temperature

Ghavami

Soltan

Chen

2021

Ind. Eng. Chem. Res.

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A series of MnO x /Al2O3 catalysts were synthesized by polyol and dry impregnation methods and calcined in the range of 400–800 °C. The impact of the preparation procedure and calcination temperature was investigated to enhance the catalytic degradation of a single component and binary mixtures of acetone and toluene at room temperature. The polyol method produces catalysts with a higher surface area, smaller cluster size, and lower oxidation state than the impregnation method. The results indicated that the oxidation state of manganese shifted to lower values by increasing the calcination temperature, which had a beneficial influence on the catalytic performance. As calcination temperature increases to 800 °C, the catalyst exhibited excellent catalytic activity in acetone degradation while no significant change was observed in degradation of toluene. In the binary mixture, toluene conversion was promoted whereas the acetone conversion was inhibited. X-ray absorption near-edge structure and extended X-ray absorption fine structure results of the spent catalysts showed that, unlike acetone, toluene altered the local structure of manganese oxides during the reaction. The catalyst was susceptible for the reduction process with toluene due to the accumulation of carbonaceous species resulting from incomplete oxidation of toluene.

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The performance and reaction pathway of δ-MnO2/USY for catalytic oxidation of toluene in the presence of ozone at room temperature

Cited by 33 publications

References 33 publications

Tuning the Micro-coordination Environment of Al in Dealumination Y Zeolite to Enhance Electron Transfer at the Cu–Mn Oxides Interface for Highly Efficient Catalytic Ozonation of Toluene at Low Temperatures

Tuning the Micro-coordination Environment of Al in Dealumination Y Zeolite to Enhance Electron Transfer at the Cu–Mn Oxides Interface for Highly Efficient Catalytic Ozonation of Toluene at Low Temperatures

MnO₂‐Based Materials for Environmental Applications

Enhancing Catalytic Ozonation of Acetone and Toluene in Air Using MnO_x/Al₂O₃ Catalysts at Room Temperature

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The performance and reaction pathway of δ-MnO2/USY for catalytic oxidation of toluene in the presence of ozone at room temperature

Cited by 33 publications

References 33 publications

Tuning the Micro-coordination Environment of Al in Dealumination Y Zeolite to Enhance Electron Transfer at the Cu–Mn Oxides Interface for Highly Efficient Catalytic Ozonation of Toluene at Low Temperatures

Tuning the Micro-coordination Environment of Al in Dealumination Y Zeolite to Enhance Electron Transfer at the Cu–Mn Oxides Interface for Highly Efficient Catalytic Ozonation of Toluene at Low Temperatures

MnO2‐Based Materials for Environmental Applications

Enhancing Catalytic Ozonation of Acetone and Toluene in Air Using MnOx/Al2O3 Catalysts at Room Temperature

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Product

Resources

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MnO₂‐Based Materials for Environmental Applications

Enhancing Catalytic Ozonation of Acetone and Toluene in Air Using MnO_x/Al₂O₃ Catalysts at Room Temperature