The oxidation of chlorinated organic compounds over W-modified Pt/CeO2 catalysts

Gu, Yan; Shao, Shijie; Sun, Wei; Xia, Hangqi; Gao, Xiaohui; Dai, Qiguang; Wang, Zhan; Wang, Xingyi

doi:10.1016/j.jcat.2019.06.041

Cited by 80 publications

(25 citation statements)

References 54 publications

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“…Meanwhile, the inorganic chlorine species deposited on the spent MoPt-110Mn (2.57%) was less than that of Pt-110Mn (7.99%), because the abundant surface hydroxyl groups as Brønsted sites promoted the removal of adsorbed Cl species in form of HCl, and the surface molybdate species such as monomolybdate and polymolybdate as polyoxometalate anion suppressed the adsorption of Cl species. By the way, the latter was practicable for vanadate-, tungstate-, sulfate-, or phosphate-modified other oxides catalysts. ,− …”

Section: Resultsmentioning

confidence: 99%

Pt and Mo Co-Decorated MnO₂ Nanorods with Superior Resistance to H₂O, Sintering, and HCl for Catalytic Oxidation of Chlorobenzene

Chen

Cai

Zhang

et al. 2021

Environ. Sci. Technol.

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MnO2 nanorods with exposed (110), (100), or (310) facets were prepared and investigated for catalytic oxidation of chlorobenzene, then the (110)-exposed MnO2 nanorod was screened as the candidate parent and further modified by Pt and/or Mo with different contents. The loading of Pt enhanced activity and versatility of the pristine MnO2, but the polychlorinated byproducts and Cl2 were promoted, conversely, as the decoration of Mo inhibited the polychlorinated byproducts and improved durability. Determination of structure and properties suggested that Pt facilitated the formation of more oxygen vacancies/Mn3+ and surface adsorbed oxygen weakened the bonds of surface lattice oxygen, while Mo stabilized surface lattice oxygen and increased acid sites, especially Brønsted acid sites. Expectedly, Pt and Mo bifunctionally modified MnO2 presented a preferable activity, selectivity, and durability along with the super resistance to H2O, high-temperature, and HCl, and no prominent deactivation was observed within 30 h at 300 °C under dry and humid conditions, even at high-temperature aging at 600 °C and HCl-pretreatment (7 h). In this work, the optimized Mo and Pt codecorated MnO2 was considered a promising catalyst toward practical applications for catalytic oxidation of actual Cl-VOCs emissions.

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Section: Resultsmentioning

confidence: 99%

Pt and Mo Co-Decorated MnO₂ Nanorods with Superior Resistance to H₂O, Sintering, and HCl for Catalytic Oxidation of Chlorobenzene

Chen

Cai

Zhang

et al. 2021

Environ. Sci. Technol.

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“…The use of a catalyst reduces the activation energy and makes it possible to oxidize VOCs at a lower temperature. The catalytic oxidation of benzene (B), chlorobenzene (CB), and 1,2dichlorobenzene (1,2-DCB) over W-modified Pt/CeO 2 catalysts has been studied [143]. A decrease in the strength of Cl adsorption on Ce and Pt sites can be promoted by the addition of W. The interaction of W with Pt species led to the formation of Pt-O-W structures, which promoted the reducibility and availability of surface oxygen.…”

Section: Oxidation Of Volatile Organic Compounds (Vocs)mentioning

confidence: 99%

An Insight into Geometries and Catalytic Applications of CeO2 from a DFT Outlook

et al. 2021

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Rare earth metal oxides (REMOs) have gained considerable attention in recent years owing to their distinctive properties and potential applications in electronic devices and catalysts. Particularly, cerium dioxide (CeO2), also known as ceria, has emerged as an interesting material in a wide variety of industrial, technological, and medical applications. Ceria can be synthesized with various morphologies, including rods, cubes, wires, tubes, and spheres. This comprehensive review offers valuable perceptions into the crystal structure, fundamental properties, and reaction mechanisms that govern the well-established surface-assisted reactions over ceria. The activity, selectivity, and stability of ceria, either as a stand-alone catalyst or as supports for other metals, are frequently ascribed to its strong interactions with the adsorbates and its facile redox cycle. Doping of ceria with transition metals is a common strategy to modify the characteristics and to fine-tune its reactive properties. DFT-derived chemical mechanisms are surveyed and presented in light of pertinent experimental findings. Finally, the effect of surface termination on catalysis by ceria is also highlighted.

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“…One of the main challenges is to select suitable, economical and highly efficient catalysts from large number of potential alternatives. Solid catalytic materials commonly investigated are supported precious metal catalysts [10][11][12][13][14][15][16], solid acid catalysts [16][17][18][19][20][21][22] and transition metal/rare earth oxide catalysts [23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, WO 3-x with abundant oxygen vacancies, noticeable resistance to thermal shock and hydrochloric acid corrosion can be used as the active or additive component of catalyst [37][38][39][40][41]. It has both acidity and oxidizability, showing certain catalytic activity for Cl-VOCs degradation [35,37,38]. Acidity can improve the adsorption and activation of chlorinated organic molecules on the catalyst surface, and oxidizability is helpful for the deep oxidation of intermediates to form CO 2 and H 2 O [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Preparation of tungsten–iron composite oxides and application in environmental catalysis for volatile organic compounds degradation

et al. 2021

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Emission of volatile organic compounds has important influence on complex air pollution and human health. In this paper, a series of tungsten-iron composite oxides with different proportions and preparation methods were synthesized and first used for catalytic combustion of chlorobenzene and toluene, as typical polluting gas sources. These WO 3 -based solid catalytic materials were systematically characterized by modern analytical methods, and the results showed that there was strong electron interaction between W and Fe elements in the composite oxides, and the presence of a certain amount of tungsten oxide inhibited the crystallization of iron oxide, and vice versa, which were beneficial to the uniform dispersion of tungsten-iron components into each other and the improvement of redox properties. Compared with single-component oxide, the formation of tungsten-iron composite oxide affected the micro-structure, improved the specific surface area and optimized the pore structure of materials. The performance test results showed that the tungsten-iron composite oxide (FeWO 4 -0.5Fe 2 O 3 , molar ratio of tungsten and iron was 1/2) prepared using citric acid-based sol-gel method was the optimal, and its catalytic degradation efficiency could reach 90% for chlorobenzene and 83% for toluene at 320 °C, and maintain at least 60 h without obvious deactivation, with high selectivity to the formation of HCl and CO 2 . KeywordsVolatile organic compounds • Catalytic combustion • WO 3 • FeWO 4 • Composite oxide • Synergistic catalytic effect Tungsten www.springer.com/42864

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The oxidation of chlorinated organic compounds over W-modified Pt/CeO2 catalysts

Cited by 80 publications

References 54 publications

Pt and Mo Co-Decorated MnO₂ Nanorods with Superior Resistance to H₂O, Sintering, and HCl for Catalytic Oxidation of Chlorobenzene

Pt and Mo Co-Decorated MnO₂ Nanorods with Superior Resistance to H₂O, Sintering, and HCl for Catalytic Oxidation of Chlorobenzene

An Insight into Geometries and Catalytic Applications of CeO2 from a DFT Outlook

Preparation of tungsten–iron composite oxides and application in environmental catalysis for volatile organic compounds degradation

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The oxidation of chlorinated organic compounds over W-modified Pt/CeO2 catalysts

Cited by 80 publications

References 54 publications

Pt and Mo Co-Decorated MnO2 Nanorods with Superior Resistance to H2O, Sintering, and HCl for Catalytic Oxidation of Chlorobenzene

Pt and Mo Co-Decorated MnO2 Nanorods with Superior Resistance to H2O, Sintering, and HCl for Catalytic Oxidation of Chlorobenzene

An Insight into Geometries and Catalytic Applications of CeO2 from a DFT Outlook

Preparation of tungsten–iron composite oxides and application in environmental catalysis for volatile organic compounds degradation

Contact Info

Product

Resources

About

Pt and Mo Co-Decorated MnO₂ Nanorods with Superior Resistance to H₂O, Sintering, and HCl for Catalytic Oxidation of Chlorobenzene

Pt and Mo Co-Decorated MnO₂ Nanorods with Superior Resistance to H₂O, Sintering, and HCl for Catalytic Oxidation of Chlorobenzene