Catalytic combustion of CVOCs over MoOx/CeO2 catalysts

Zhang, Hao; Gao, Xiaohui; Gong, Binwei; Shao, Shijie; Tu, Chensheng; Pan, Jun; Wang, Yangyang; Dai, Qiguang; Guo, Yanglong; Wang, Xingyi

doi:10.1016/j.apcatb.2022.121240

Cited by 40 publications

(11 citation statements)

References 48 publications

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“…Chlorinated volatile organic compounds (CVOCs) are common raw materials and organic solvents in industrial production, which could directly cause terrible hazards to public health and the environment due to their long-term durability, high toxicity and poor reactivity. 1,2 Thus, it is crucial to develop an efficient and stable degradation technology to reduce the emission of CVOCs. Catalytic oxidation is recognized as an efficient strategy to eliminate CVOCs due to its high destructive efficiency, low operation temperature and green environment effect.…”

Section: Introductionmentioning

confidence: 99%

Plasma-etched CeO₂ nanorods with rich defect sites and acidity for dichloroethane oxidation

Huo

Xue

Jiang

et al. 2023

Environ. Sci.: Nano

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Section: Introductionmentioning

confidence: 99%

Plasma-etched CeO₂ nanorods with rich defect sites and acidity for dichloroethane oxidation

Huo

Xue

Jiang

et al. 2023

Environ. Sci.: Nano

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“…Thanks to the oxygen vacancy, reducible oxides are widely used in oxidation-involved heterogeneous catalytic reactions. − For example, Liu et al found that CeO 2 nanorod exhibits superior catalytic performance in the oxidation coupling of alcohol and amine, and they proposed the promising catalytic performance was closely related to a significant number of oxygen vacancies and an appropriate interaction between CeO 2 and the carbon support . In addition to CeO 2 , MnO 2 is another typical representative of reducible oxides.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Reaction-Directed Green Synthesis of CeO₂–MnO₂ Catalysts for Imine Production through Oxidative Coupling of Alcohols and Amines

Liu

et al. 2023

Inorg. Chem.

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Direct oxidative coupling of alcohols with amines over cheap but efficient catalysts is a promising choice for imine formation. In this study, porous CeO2-MnO2 binary oxides were prepared via an interfacial reaction between Ce2(SO4)3 and KMnO4 at room temperature without any additives. The as-prepared porous CeO2–MnO2 catalyst has a higher fraction of Ce3+, Mn3+, and Mn4+ and contains larger surface area and more oxygen vacancies. During the oxidative coupling reaction of alcohol with amine to imine, the as-obtained CeO2–MnO2 catalyst is motivated by the above encouraging characteristics and exhibits superior catalytic activity (98% conversion and 97% selectivity) and can also work effectively under a wide scope of temperatures and substrates. The in-depth in situ DRIFTS and density functional theory (DFT) results demonstrate that there is a strong interaction between CeO2 and MnO2 in the CeO2–MnO2 catalyst, exhibiting especially a positive synergistic effect in the direct coupling of alcohol and amine reaction.

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“…5,6 Therefore, due to its redox properties, ceria is an excellent support material and has been employed in a variety of reactions, such as NO 2 storage, 7 NH 3 selective catalytic reduction (SCR), 8 CO oxidation, 9 reverse water-gas shift reaction, 10 and CO 2 hydrogenation 11 as well as alcohol 12 and alkane 13 oxidative dehydrogenations (ODHs). The corresponding active phases are very diverse and can typically be either a metal (e.g., gold, 10 copper, 14 platinum 15 ) or an oxide (e.g., MnO x , 16 VO x , 13 MoO x 17 ), depending on the application. A catalyst commonly used in the oxidation of alcohols and short chain alkanes is ceria-supported vanadia (VO x / CeO 2 ).…”

Section: ■ Introductionmentioning

confidence: 99%

Understanding the Reduction Behavior of VO_x/CeO₂ on a Molecular Level: Combining Temperature-Programmed Reduction with Multiple In-Situ Spectroscopies and X-ray Diffraction

et al. 2023

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As catalytic processes become more important in academic and industrial applications, an intimate understanding is highly desirable to improve their efficiency on a rational basis. Because thorough mechanistic investigations require an elaborate and expensive spectroscopic and theoretical analysis, it is a major goal to link mechanistic insights to simple descriptors, such as the reducibility, that are accessible by temperature-programmed reduction (TPR) experiments, to bridge the gap between fundamental understanding and application of catalysts. In this work, we present a detailed in-situ spectroscopic analysis of TPR results from loading-dependent VO x /CeO 2 catalysts, using in-situ multiwavelength Raman, IR, UV−vis, and quasi-in-situ X-ray photoelectron spectroscopy as well as in-situ X-ray diffraction. The catalyst reduction shows a complex network of different processes, contributing to the overall reducibility, which are controlled by the unique interaction at the vanadia−ceria interface. The temperatures at which they occur depend significantly on the nuclearity of the surface vanadia species. By elucidating the temperature-and vanadia loading-dependent behavior, we provide a fundamental understanding of the underlying molecular processes, thus developing an important basis for interpretation of the reduction behavior of other oxide catalysts.

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Catalytic combustion of CVOCs over MoOx/CeO2 catalysts

Cited by 40 publications

References 48 publications

Plasma-etched CeO₂ nanorods with rich defect sites and acidity for dichloroethane oxidation

Plasma-etched CeO₂ nanorods with rich defect sites and acidity for dichloroethane oxidation

Interfacial Reaction-Directed Green Synthesis of CeO₂–MnO₂ Catalysts for Imine Production through Oxidative Coupling of Alcohols and Amines

Understanding the Reduction Behavior of VO_x/CeO₂ on a Molecular Level: Combining Temperature-Programmed Reduction with Multiple In-Situ Spectroscopies and X-ray Diffraction

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Catalytic combustion of CVOCs over MoOx/CeO2 catalysts

Cited by 40 publications

References 48 publications

Plasma-etched CeO2 nanorods with rich defect sites and acidity for dichloroethane oxidation

Plasma-etched CeO2 nanorods with rich defect sites and acidity for dichloroethane oxidation

Interfacial Reaction-Directed Green Synthesis of CeO2–MnO2 Catalysts for Imine Production through Oxidative Coupling of Alcohols and Amines

Understanding the Reduction Behavior of VOx/CeO2 on a Molecular Level: Combining Temperature-Programmed Reduction with Multiple In-Situ Spectroscopies and X-ray Diffraction

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Product

Resources

About

Plasma-etched CeO₂ nanorods with rich defect sites and acidity for dichloroethane oxidation

Plasma-etched CeO₂ nanorods with rich defect sites and acidity for dichloroethane oxidation

Interfacial Reaction-Directed Green Synthesis of CeO₂–MnO₂ Catalysts for Imine Production through Oxidative Coupling of Alcohols and Amines

Understanding the Reduction Behavior of VO_x/CeO₂ on a Molecular Level: Combining Temperature-Programmed Reduction with Multiple In-Situ Spectroscopies and X-ray Diffraction