Noble Metal Single‐Atom Catalysts for the Catalytic Oxidation of Volatile Organic Compounds

Zhang, Lina; Xue, Linli; Lin, Bingyong; Zhao, Qingao; Wan, Shaolong; Wang, Yong; Jia, Hongpeng; Xiong, Haifeng

doi:10.1002/cssc.202102494

Cited by 28 publications

(13 citation statements)

References 106 publications

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“…Some studies have suggested that the adsorption and activation of toluene is mainly related to the acidic sites on the catalyst surface. , NH 3 -TPD can reflect the change of acidity in the materials. As shown in Figure S9, all the catalysts exhibited a similar ammonia adsorption peak at about 120 °C, which corresponded to the weak acid sites in the zeolite, and the ammonia adsorption peaks above 350 °C generally correspond to the strong acid sites .…”

Section: Results and Discussionmentioning

confidence: 99%

“…6 Precious metals are often effective catalysts for eliminating VOCs. 8,9 However, the high price limits their industrial application. Transition metals such as manganese oxides (MnOx) are regarded as potential substitutes.…”

Section: Introductionmentioning

confidence: 99%

“…Although the catalytic ozonation of VOCs still has some challenges, such as catalyst stability, COx selectivity, moisture resistance, complex reaction mechanism, and so forth, it is still a quite promising research direction . Precious metals are often effective catalysts for eliminating VOCs. , However, the high price limits their industrial application. Transition metals such as manganese oxides (MnOx) are regarded as potential substitutes.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…30,31 With the development of more advanced synthesis and characterization techniques, supported single-atom PGM catalysts have also emerged as a new type of efficient catalytic material for HC oxidation. 33,34 Recently, Pt single-atom (Pt 1 ) catalysts supported on CeO 2based supports have been intensively studied in CO oxidation due to their near 100% atomic utilization efficiency and satisfactory stability. 35−39 Although the Pt 1 catalysts supported on CeO 2 are generally considered to show limited CO oxidation activity due to the CO poisoning effect, 40 after finetuning the local structure or chemical states of Pt 1 species, significantly enhanced CO oxidation performance could be achieved.…”

Section: Introductionmentioning

confidence: 99%

Surface Lattice-Embedded Pt Single-Atom Catalyst on Ceria-Zirconia with Superior Catalytic Performance for Propane Oxidation

Tan

Xie

Cai

et al. 2023

Environ. Sci. Technol.

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Tuning the metal–support interaction and coordination environment of single-atom catalysts can help achieve satisfactory catalytic performance for targeted reactions. Herein, via the facile control of calcination temperatures for Pt catalysts on pre-stabilized Ce0.9Zr0.1O2 (CZO) support, Pt single atoms (Pt1) with different strengths of Pt–CeO2 interaction and coordination environment were successfully constructed. With the increase in calcination temperature from 350 to 750 °C, a stronger Pt–CeO2 interaction and higher Pt-O-Ce coordination number were achieved due to the reaction between PtO x and surface Ce3+ species as well as the migration of Pt1 into the surface lattice of CZO. The Pt/CZO catalyst calcined at 750 °C (Pt/CZO-750) exhibited a surprisingly higher C3H8 oxidation activity than that calcined at 550 °C (Pt/CZO-550). Through systematic characterizations and reaction mechanism study, it was revealed that the higher concentration of surface Ce3+ species/oxygen vacancies and the stronger Pt–CeO2 interaction on Pt/CZO-750 could better facilitate the activation of oxygen to oxidize C3H8 into reactive carbonate/carboxyl species and further promote the transformation of these intermediates into gaseous CO2. The Pt/CZO-750 catalyst can be a potential candidate for the catalytic removal of hydrocarbons from vehicle exhaust.

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“…Serving as a kind of prototypical VOCs, propane (C3H8) and propylene (C3H6) have been reckoned as the important pollutants resulting in green-house effect and photochemical smog 18,19 . Catalytic oxidation has been placed a great expectation on the abatement of VOCs on account of its high efficiency at low temperatures 20 . For catalytic oxidation of C3H8 and C3H6, the supported Pt nanoparticles (NPs) have been regarded as one of the most promising and widely studied catalysts, since the Pt NPs-based catalysts usually exhibit relatively high activity at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Photo-Thermo Catalytic Oxidation of C3H8 and C3H6 over the WO3-TiO2 Supported Pt Single-Atom Catalyst

Zhu¹,

Kang²,

Li³

et al. 2023

Acta Physico Chimica Sinica

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Catalytic oxidation is a commonly employed technology in the industry for removing volatile organic compounds (VOCs) due to its exceptional efficiency under mild operating conditions. Although supported Pt-based nano-catalysts are recognized widely as one of the most promising and extensively used industrial catalysts for VOC abatement, their practical application, and development are restricted by their exorbitant cost. Single-atom catalyst (SAC) with maximized metal utilization and exclusive electronic character has been explored extensively in various catalytic reactions. However, Pt SAC is usually deemed to be inactive in hydrocarbon oxidation reactions in thermal catalysis, compared with its nanoparticle counterpart. Here, we demonstrate that the WO3-TiO2 supported Pt SAC (Pt1/WO3-TiO2) exhibits much higher activities than the corresponding nanoparticle catalyst (PtNP/WO3-TiO2) in photo-thermo catalytic oxidation of C3H8 and C3H6, which represent different kinds of typical VOCs. A key finding is that the activities of Pt1/WO3-TiO2 and PtNP/WO3-TiO2 can be accelerated in photo-thermo catalytic C3H8 oxidation by overcoming oxygen poisoning. Upon the light irradiation, the apparent active energy (Ea) of the Pt1/WO3-TiO2 and PtNP/WO3-TiO2 decline from 116 to 60 kJ·mol −1 and from 103 to 30 kJ·mol −1 , respectively, substantiating their effectiveness in photo-thermo catalysis. Notably, a substantially higher reaction rate of 3792 μmol•gPt −1 •s −1 on the Pt1/WO3-TiO2 is achieved, which should be a benchmark for C3H8 oxidation. More intriguingly, photo-thermo catalytic C3H6 oxidation on the PtNP/WO3-TiO2 is prohibited due to the strong adsorption-induced C3H6 poisoning on the Pt nanoparticles, for which the Ea of the PtNP/WO3-TiO2 catalyst for C3H6 oxidation is maintained at approximately 55 kJ·mol −1 , regardless of the light irradiation. In comparison, the C3H6 poisoning on the Pt1/WO3-TiO2 can be mitigated by light illumination, where the Ea of the Pt1/WO3-TiO2 catalyst for C3H6 oxidation dramatically reduced from 49 to 16 kJ·mol −1 , signifying that the high energy barrier of C3H6 oxidation can be mediated by the light. Profiting from the apt affinity between C3H6 and Pt single atoms, the photogenerated electrons accumulated on the Pt single atoms produce repulsive force towards the electron-rich C3H6 molecules, which is conducive to the C3H6 desorption from the Pt1/WO3-TiO2. Therefore, the Pt1/WO3-TiO2 exhibits enhanced activity in photo-thermo catalytic C3H6 oxidation. This study exemplifies that the advantages of SAC are not only saving the consumption of precious metals but also discovering new catalytic reactions on the account of the specific electronic characteristic.

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Noble Metal Single‐Atom Catalysts for the Catalytic Oxidation of Volatile Organic Compounds

Cited by 28 publications

References 106 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

Surface Lattice-Embedded Pt Single-Atom Catalyst on Ceria-Zirconia with Superior Catalytic Performance for Propane Oxidation

Photo-Thermo Catalytic Oxidation of C<sub>3</sub>H<sub>8</sub> and C<sub>3</sub>H<sub>6</sub> over the WO<sub>3</sub>-TiO<sub>2</sub> Supported Pt Single-Atom Catalyst

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