Role of Cryptomelane in Surface-Adsorbed Oxygen and Mn Chemical Valence in MnO<sub><i>x</i></sub> during the Catalytic Oxidation of Toluene

Zhang, Xuejun; Ma, Ziang; Song, Zhongxian; Zhao, Heng; Zhao, Min; Zhao, Jinhua

doi:10.1021/acs.jpcc.9b02499

Cited by 64 publications

(17 citation statements)

References 53 publications

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“…By concluding the available literature, the schematic diagram of possible degradation routes at different temperature sections was described in Figure 8d. According to the literature, [51,52] O ads can be released at low temperatures to form oxygen vacancies and enhance the mobility of lattice oxygen, which was of vital importance to degrade VOCs. What's more, the relationship between O ads , O latt, and catalyst activity proved that when reactive oxygen species reacted with toluene, a high concentration of O ads was benefited to O 2 in the gas phase to quickly supplement oxygen vacancy to accelerate oxygen circulation and enhance the activity [25,53,54] .…”

Section: Resultsmentioning

confidence: 99%

Catalytic Combustion of Toluene Over Broccoli‐Shaped Ce₁Mn₃Ox Solid Solution

Niu

Zhang

et al. 2021

ChemCatChem

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Ce1Mn3Ox with broccoli morphology were synthesized by simple redox‐precipitation. A series of Ce−Mn‐based catalysts with different activities were obtained by changing calcination time. The catalytic activity of Ce−Mn solid solution was greatly improved compared with that of pure oxides. Ce1Mn3Ox‐1 (C1M3‐1) briefly calcined at 400 °C showed the optimal catalytic performance (WHSV=60000 mL h−1 g−1, Toluene concentration=3000 ppm, T100%=180 °C). The characterization results unambiguously identified that C1M3‐1 had a large amount of Ce3+, Mn3+ and surface adsorbed oxygen. This work emphasized the preparation of Ce−Mn‐based solid solution with strong interaction by simple redox precipitation, and the activity of the catalyst was regulated by changing the calcination time. The advantages of low cost, high efficiency, good stability, and recycling indicated that the catalyst had the possibility of industrial application.

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Section: Resultsmentioning

confidence: 99%

Catalytic Combustion of Toluene Over Broccoli‐Shaped Ce₁Mn₃Ox Solid Solution

Niu

Zhang

et al. 2021

ChemCatChem

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“…Hence, the surface adsorption oxygen plays a significant role in the catalytic oxidation process of toluene due to its active chemical properties. [ 25,30,70,79 ] The CM‐100 sample should therefore exhibit higher catalytic activity in toluene combustion.…”

Section: Resultsmentioning

confidence: 99%

Controllable construction of Ce‐Mn‐O_x with tunable oxygen vacancies and active species for toluene catalytic combustion

Huang

Zhao

Song

et al. 2020

Applied Organom Chemis

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A series of Ce‐Mn‐Ox catalysts synthesized under different hydrothermal conditions were evaluated by catalytic removal of toluene. The results of characterization showed that the contents of oxygen vacancies and active species in catalysts were crucial for the catalytic oxidation process. The concentration of Ce3+, Mn3+, and adsorbed oxygen associated with structural defects in Ce‐Mn‐Ox catalysts could be controlled by hydrothermal conditions, which were considered to promote redox capacity and improve catalytic oxidation performance. In addition, suitable synthetic conditions could increase the SBET and Vp of catalysts. Among the prepared catalysts, CM‐100 showed the best catalytic performance due to the generation of more defective oxygen and active species (Ce3+, Mn3+, and surface‐adsorbed oxygen). In addition, the CM‐100 catalyst showed satisfactory water resistance and stability.

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“…The adsorbed oxygen species of Mn4Ni1 can be desorbed at 241 °C, which is lower than the other three samples; thus, Mn4Ni1 exhibits stronger oxygen mobility. It is widely accepted that the catalytic oxidation activity of catalyst can be influenced by oxygen mobility …”

Section: Resultsmentioning

confidence: 99%

“…It is widely accepted that the catalytic oxidation activity of catalyst can be influenced by oxygen mobility. 40,41 The results of H 2 -TPR measurements carried out to detect the reducibility of the as-synthesized catalysts are illustrated in Fig. 7(b).…”

Section: Characterizationsmentioning

confidence: 99%

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Guo

Zhi

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Benzene (C6H6) is a typical kind of volatile organic compound (VOC) which can exert great harm to both human health and the environment, and, thus, which needs to be eliminated before its emission. In this work, porous manganese–nickel (Mn‐Ni) composite oxide catalysts were synthesized through the oxalate route and applied to thermal catalytic oxidation of C6H6. By means of activity tests and relative physico‐chemical characterizations, the factors affecting the activity of those Mn‐Ni composite oxides were explored. RESULTS Nitrogen (N2)‐adsorption/desorption and X‐ray photoelectron spectroscopy (XPS) measurements indicated that the Brunauer–Elmett–Teller (BET) surface area and the content of surface‐adsorbed oxygen species were increased due to the addition of Ni into Mn oxide (MnOx). Meanwhile, the oxygen mobility and reducibility also were improved in the Mn‐Ni composite oxides. Accordingly, compared with MnOx, the Mn‐Ni catalysts showed higher activity for thermal catalytic oxidation of C6H6. Moreover, porous Mn‐Ni composite oxides with a Mn:Ni molar ratio of 4:1 (Mn4Ni1) displayed the best catalytic activity. Further investigation indicated that the excellent catalytic performance of Mn4Ni1 composite oxides could be ascribed mainly to the larger BET surface area and the richer content of surface‐adsorbed oxygen species, as well as stronger oxygen mobility and better reducibility compared with other Mn‐Ni catalysts. CONCLUSIONS The Mn4Ni1 composite oxides showed a lowest T90 value of 172 °C (C6H6 concentration 200 ppm, WHSV 60 000 mL g−1 h−1) among all of the obtained Mn‐Ni composite oxides. Moreover, it also exhibited favourable catalytic stability at 210 °C in the presence or absence of moisture. © 2019 Society of Chemical Industry

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Role of Cryptomelane in Surface-Adsorbed Oxygen and Mn Chemical Valence in MnO_x during the Catalytic Oxidation of Toluene

Cited by 64 publications

References 53 publications

Catalytic Combustion of Toluene Over Broccoli‐Shaped Ce₁Mn₃Ox Solid Solution

Catalytic Combustion of Toluene Over Broccoli‐Shaped Ce₁Mn₃Ox Solid Solution

Controllable construction of Ce‐Mn‐O_x with tunable oxygen vacancies and active species for toluene catalytic combustion

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

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Role of Cryptomelane in Surface-Adsorbed Oxygen and Mn Chemical Valence in MnOx during the Catalytic Oxidation of Toluene

Cited by 64 publications

References 53 publications

Catalytic Combustion of Toluene Over Broccoli‐Shaped Ce1Mn3Ox Solid Solution

Catalytic Combustion of Toluene Over Broccoli‐Shaped Ce1Mn3Ox Solid Solution

Controllable construction of Ce‐Mn‐Ox with tunable oxygen vacancies and active species for toluene catalytic combustion

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

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Role of Cryptomelane in Surface-Adsorbed Oxygen and Mn Chemical Valence in MnO_x during the Catalytic Oxidation of Toluene

Catalytic Combustion of Toluene Over Broccoli‐Shaped Ce₁Mn₃Ox Solid Solution

Catalytic Combustion of Toluene Over Broccoli‐Shaped Ce₁Mn₃Ox Solid Solution

Controllable construction of Ce‐Mn‐O_x with tunable oxygen vacancies and active species for toluene catalytic combustion