Study on the synergy effect of MnOx and support on catalytic ozonation of toluene

Dong, Yilin; Sun, Jing; Ma, Xiao; Wang, Wenlong; Song, Zhanlong; Zhao, Xiqiang; Mao, Yanpeng; Li, Wenxiang

doi:10.1016/j.chemosphere.2022.134991

Cited by 26 publications

(5 citation statements)

References 42 publications

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“…In other words, this sample possessed the largest number of surface oxygen vacancies. Combined with the results reported in the literature, we can realize that the active center of ozone decomposition was the surface oxygen vacancies. − O 3 was decomposed at oxygen vacancies, resulting in the increase in the amount of the reactive oxygen species (in agreement with the results of the O 1s XPS and the O 2 -TPD characterization). The amount of the surface oxygen species desorbed from the samples in the range of 35–250 °C decreased in an order of 2.15 (Pt NRs/CeO 2 ) > 1.42 (Pt NPs/CeO 2 ) > 0.96 (CeO 2 ) (Table ).…”

Section: Resultssupporting

confidence: 88%

Highly Efficient Catalytic Ozonization at Ultralow Temperatures of Multicomponent VOCs over the Pt/CeO₂ Catalysts

Wang,

Liu,

Deng

et al. 2023

ACS EST Eng.

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Industrial flue gas has a great impact on the atmosphere environment and human health, and its emission temperatures are usually below 180 °C, which needs a new technology that can catalyze the removal of the multicomponent VOCs over high-performance catalysts in the presence of ozone. In this work, we prepared the Pt/CeO2 catalysts with different morphologies of Pt particles and investigated their catalytic performance for the ozonization of mixed VOCs (i.e., toluene and chlorobenzene (CB)). Among all of the as-prepared samples, Pt NRs/CeO2 with nanorod-like Pt particles showed excellent catalytic performance for the ozonization of toluene and CB. The T 50% (the temperature at VOC conversion = 50%) values for toluene and CB ozonization were 40 and 48 °C at a space velocity of 40,000 mL g–1 h–1, respectively. The results of characterization revealed that the reactive oxygen species involved in the VOC ozonization were mainly the O2 – and O2 2– species, surface oxygen vacancies of CeO2 were the active sites for the conversion of ozone to the reactive oxygen species, and the O2 – species was the mainly active oxygen species in the low-temperature VOC oxidation. Furthermore, partial reactive oxygen species reacted with the Pt n+ species to generate more amount of the Pt0 species, and the metallic platinum species was the main active site for the adsorption and activation of toluene and CB. The chemisorbed VOCs at the Pt0 sites reacted with the reactive oxygen species at the interface of Pt and CeO2, resulting in the excellent low-temperature catalytic activity. Compared with the reaction without ozone participation, we find that the participation of ozone can not only decrease the reaction temperature but also reduce the production of toxic byproducts. We are sure that the Pt/CeO2 catalyst is promising in practical application for elimination of the VOCs from industrial flue gas.

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Section: Resultssupporting

confidence: 88%

Highly Efficient Catalytic Ozonization at Ultralow Temperatures of Multicomponent VOCs over the Pt/CeO₂ Catalysts

Wang,

Liu,

Deng

et al. 2023

ACS EST Eng.

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“…it can be found that ozone is more likely to be adsorbed on catalyst with a higher proportion of Mn 3+ , which is conducive to the decomposition of ozone into reactive oxygen species to participate in the catalysis. 47 The average oxidation state (AOS) of Mn calculated from the ΔE of the Mn 3s spectra further confirms that Mn 3+ can lead to more defect structures. Ce 3d spectra of catalysts show that Ce 3+ species of Pt−Ce/ Mn are much higher than Ce/Mn, which enhances the interfacial electron transfer between Pt species and Ce to balance the Fermi energy level and thus deform the interface.…”

Section: Enhancement Effect Of Bimetallic Catalysts� Electron Effectmentioning

confidence: 65%

“…The binding energy of the Mn 2p 3/2 peak of Pt–Ce/Mn is higher than that of the other samples, indicating that Ce promotes the electron transfer from Mn to Ce/Pt . Obviously, the manganese on the surface of Pt–Ce/Mn mainly exists in the form of Mn 3+ , and combining with eq (O V refers to oxygen vacancies), it can be found that ozone is more likely to be adsorbed on catalyst with a higher proportion of Mn 3+ , which is conducive to the decomposition of ozone into reactive oxygen species to participate in the catalysis . The average oxidation state (AOS) of Mn calculated from the Δ E of the Mn 3s spectra further confirms that Mn 3+ can lead to more defect structures.…”

Section: Resultsmentioning

confidence: 96%

Enhancement Effect Induced by the Second Metal to Promote Ozone Catalytic Oxidation of VOCs

Liu,

Wu,

Ouyang

et al. 2024

Environ. Sci. Technol.

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It is a promising research direction to develop catalysts with high stability and ozone utilization for low-temperature ozone catalytic oxidation of VOCs. While bimetallic catalysts exhibit excellent catalytic activity compared with conventional single noble metal catalysts, limited success has been achieved in the influence of the bimetallic effect on the stability and ozone utilization of metal catalysts. Herein, it is necessary to systematically study the enhancement effect in the ozone catalytic reaction induced by the second metal. With a simple continuous impregnation method, a platinum–cerium bimetallic catalyst is prepared. Also highlighted are studies from several aspects of the contribution of the second metal (Ce) to the stability and ozone utilization of the catalysts, including the “electronic effect” and “geometric effect”. The synergistic removal rate of toluene and ozone is nearly 100% at 30 °C, and it still shows positive stability after high humidity and a long reaction time. More importantly, the instructive significance, which is the in-depth knowledge of enhanced catalytic mechanism of bimetallic catalysts resulting from a second metal, is provided by this work.

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“…In addition, some reports pointed out that the composite catalysts showed the best performance when the mass fraction of MnO x was 5%. 52 As shown in Fig. 8(c) and (d), combined with the favorable characteristics of Al-based catalysts for ozonation and the high dispersion of aerogels on active metals, the influence of loading capacity (15 wt%) on the activity of Al-based catalyst was discussed, in order to further increase the number of active centers.…”

Section: Resultsmentioning

confidence: 99%

Preparation of MnO_x–Al₂O₃ aerogels and synergistic catalytic oxidation of toluene via ozone

Gao

Liu

et al. 2023

New J. Chem.

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Study on the synergy effect of MnOx and support on catalytic ozonation of toluene

Cited by 26 publications

References 42 publications

Highly Efficient Catalytic Ozonization at Ultralow Temperatures of Multicomponent VOCs over the Pt/CeO₂ Catalysts

Highly Efficient Catalytic Ozonization at Ultralow Temperatures of Multicomponent VOCs over the Pt/CeO₂ Catalysts

Enhancement Effect Induced by the Second Metal to Promote Ozone Catalytic Oxidation of VOCs

Preparation of MnO_x–Al₂O₃ aerogels and synergistic catalytic oxidation of toluene via ozone

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Study on the synergy effect of MnOx and support on catalytic ozonation of toluene

Cited by 26 publications

References 42 publications

Highly Efficient Catalytic Ozonization at Ultralow Temperatures of Multicomponent VOCs over the Pt/CeO2 Catalysts

Highly Efficient Catalytic Ozonization at Ultralow Temperatures of Multicomponent VOCs over the Pt/CeO2 Catalysts

Enhancement Effect Induced by the Second Metal to Promote Ozone Catalytic Oxidation of VOCs

Preparation of MnOx–Al2O3 aerogels and synergistic catalytic oxidation of toluene via ozone

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Highly Efficient Catalytic Ozonization at Ultralow Temperatures of Multicomponent VOCs over the Pt/CeO₂ Catalysts

Highly Efficient Catalytic Ozonization at Ultralow Temperatures of Multicomponent VOCs over the Pt/CeO₂ Catalysts

Preparation of MnO_x–Al₂O₃ aerogels and synergistic catalytic oxidation of toluene via ozone