Effects of dielectric barrier discharge plasma on the catalytic activity of Pt/CeO2 catalysts

Wang, Bangfen; Chen, Bingxu; Sun, Yueming; Xiao, Hailin; Xu, Xiaoxin; Fu, Mingli; Wu, Junliang; Chen, Limin; Ye, Daiqi

doi:10.1016/j.apcatb.2018.07.044

Cited by 126 publications

(42 citation statements)

References 59 publications

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“…The Pt particle sizes estimated by CO-chemisorption were as follows: PC-T (3.6 nm), PC-P (2.6 nm), PC-TP (2.8 nm), and PC-PT (2.7 nm). These calculated sizes were larger than those determined from the TEM images, which is consistent with previous reports [20,21]. The small differences between the Pt particle sizes obtained by TEM and CO-chemisorption proved the accuracy of the TEM test.…”

Section: Introductionsupporting

confidence: 91%

Plasma-Assisted Surface Interactions of Pt/CeO2 Catalyst for Enhanced Toluene Catalytic Oxidation

et al. 2018

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The performance of plasma-modified Pt/CeO 2 for toluene catalytic oxidation was investigated. Pt/CeO 2 nanorods were prepared by wet impregnation and were modified by thermal (PC-T), plasma (PC-P), and combined (PC-TP and PC-PT) treatments. The modified catalysts were characterized by TEM (transmission electron microscope), BET (Brunauer-Emmett-Teller), H 2 -TPR, O 2 -TPD, XPS, UV-Raman, and OSC tests. The significant variation of the surface morphologies and surface oxygen defects could have contributed to the modification of the Pt/CeO 2 catalysts via the plasma treatment. It was found that plasma could promote the surface interaction between Pt and CeO 2 , resulting in the thermal stability of the catalyst. The Pt-Ce interaction was also conducive to an increase in the number of oxygen vacancies. Furthermore, PC-PT and PC-TP showed a significant difference in oxygen vacancy concentrations and catalytic activities, which illustrated that the treatment sequence (plasma and thermal treatment) affected the performance of Pt/CeO 2 . The PC-PT sample showed the highest catalytic activity with T 100 at 205 • C. This work thus demonstrates that plasma in combined treatment sequences could assist surface interactions of catalysts for enhanced toluene catalytic oxidation.

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Section: Introductionsupporting

confidence: 91%

Plasma-Assisted Surface Interactions of Pt/CeO2 Catalyst for Enhanced Toluene Catalytic Oxidation

et al. 2018

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“…The six peaks at 881.9 eV, 888.5 eV, 897.6 eV, 900.4 eV, 906.6 eV, and 916.1 eV can be assigned to Ce 4+ [27]; while the other two peaks at 883.9 eV and 901.9 eV can be ascribed to Ce 3+ [37,38]. Additionally, as calculated from the results of the Ce 3d spectra, the Ce 3+ content of Pt 0.3 /CeO 2 was 21.7%, which was a little higher than that of Pt 0.1 /CeO 2 (21.2%) and Pt 0.5 /CeO 2 (20.0%), indicating a higher concentration of oxygen vacancy on the surface of the Pt 0.3 /CeO 2 sample [32,39]. Figure 8b shows that the ratios of Pt 0 /(Pt 0 + Pt 2+ ) for the Pt 0.1 /CeO 2 , Pt 0.3 /CeO 2 and Pt 0.5 /CeO 2 catalysts are 65.8%, 64.4% and 62.1%, respectively.…”

Section: Resultsmentioning

confidence: 99%

The Preparation and Catalytic Properties of Nanoporous Pt/CeO2 Composites with Nanorod Framework Structures

Wang

Duan

et al. 2019

Nanomaterials

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Pt/CeO2 catalysts with nanoporous structures were prepared by the facile dealloying of melt-spun Al92−XCe8PtX (X = 0.1; 0.3 and 0.5) ribbons followed by calcination. The phase compositions and structural parameters of the catalysts were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM). The specific surface area and pore size distribution were characterized by N2 adsorption–desorption tests. The catalytic properties were evaluated by a three-way catalyst (TWC) measurement system. The results revealed that the dealloyed samples exhibited a nanorod framework structure. The Pt nanoparticles that formed in situ were supported and highly dispersed on the CeO2 nanorod surface and had sizes in the range of 2–5 nm. For the catalyst prepared from the melt-spun Al91.7Ce8Pt0.3 ribbons, the 50% CO conversion temperature (T50) was 91 °C, and total CO could be converted when the temperature was increased to 113 °C. An X-ray photoelectron spectroscopy (XPS) test showed that the Pt0.3/CeO2 sample had a slightly richer oxygen vacancy; and a H2 temperature-programmed reduction (H2-TPR) test demonstrated its superior adsorption ability for reduction gas and high content of active oxygen species. The experiments indicated that the catalytic performance could be retained without any attenuation after 130 h when water and CO2 were present in the reaction gas. The favorable catalytic activities were attributed to the high specific areas and small pore and Pt particle sizes as well as the strong interactions between the CeO2 and Pt nanoparticles. The Pt nanoparticles were embedded in the surface of the CeO2 nanorods, inhibiting growth. Therefore, the catalytic stability and water resistance were excellent.

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“…Although this alternative does not allow energy consumption and processing duration to be reduced, it enables enhanced catalytic properties like those described previously to be obtained. Wang et al (2018a) applied an O 2 /N 2 (20/80) DBD plasma through a high-voltage AC source with a frequency of 1.8 kHz for 30 min in Pt/CeO 2 catalyst prepared by a conventional method prior to use. Characterization and catalytic tests revealed that the plasma modified the catalyst structure and enhanced the metal-support interaction.…”

Section: Plasma Modification Of Supported Metal Catalysts After Prepamentioning

confidence: 99%

The Potential of Non-thermal Plasmas in the Preparation of Supported Metal Catalysts for Fuel Conversion in Automotive Systems: A Literature Overview

2020

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The growing demand for energy worldwide and the extensive use of fossil fuels have resulted in severe environmental problems such as air pollution and the accumulation of greenhouse gases in the atmosphere. In this scenario, both new energy sources and more efficient energy conversion processes have been deeply studied. Heterogeneous catalysis is currently widely used for hydrogen production due to its higher selectivity and conversion compared to other processes. Although the use of catalysts is fundamental for green chemistry, their production through traditional methods is less environmentally friendly. Nonetheless, in order to obtain more efficient supported metal catalysts, interest in using non-thermal plasma as a pretreatment or synthesis technique is increasing. Thus, the present article aims at summarizing and briefly discussing the relevant research results on this subject, elucidating the advantages and disadvantages of using nonthermal plasmas in the preparation of supported metal catalysts. Aspects such as morphology, the chemical composition of the catalytic surface, crystallographic phases, average size and dispersion of crystallites, specific surface area, and metal-support interaction have been analyzed. The use of plasma-assisted techniques contributes to the synthesis of supported metal catalysts with smaller, more dispersed, and strongly bonded active particles, resulting in higher catalytic activity, conversion rate, selectivity, and durability. In addition, plasma allows the synthesis of supported metal catalysts to be enhanced by reducing the process time, the use of hazardous substances, and the temperature required.

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Effects of dielectric barrier discharge plasma on the catalytic activity of Pt/CeO2 catalysts

Cited by 126 publications

References 59 publications

Plasma-Assisted Surface Interactions of Pt/CeO2 Catalyst for Enhanced Toluene Catalytic Oxidation

Plasma-Assisted Surface Interactions of Pt/CeO2 Catalyst for Enhanced Toluene Catalytic Oxidation

The Preparation and Catalytic Properties of Nanoporous Pt/CeO2 Composites with Nanorod Framework Structures

The Potential of Non-thermal Plasmas in the Preparation of Supported Metal Catalysts for Fuel Conversion in Automotive Systems: A Literature Overview

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