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Wei-Ping Dow

Bio: Wei-Ping Dow is an academic researcher from National Tsing Hua University. The author has contributed to research in topics: Catalysis & Yttria-stabilized zirconia. The author has an hindex of 7, co-authored 7 publications receiving 852 citations.

Papers
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TL;DR: In this article, the reducibility and characteristics of the supported copper oxide catalysts with various copper loadings were revealed and determined by temperature-programmed reduction (TPR) and electron paramagnetic resonance (EPR), respectively.

328 citations

Journal ArticleDOI
TL;DR: In this paper, the catalytic activity of copper oxide supported on yttria-stabilized zirconia (YSZ) and γ-alumina, respectively, using impregnation methods, was measured and compared with those supported on γ alumina and with commercial γaluminina supported precious metals (PMs) (Pd and Pt).

168 citations

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TL;DR: In this paper, temperature-programmed reduction (TPR) and X-ray diffraction (XRD) were used to characterize the catalysts of CuO/γ-Al2O3 catalysts.
Abstract: Yttria-doped ceria (YDC) and pure ceria (CeO2), respectively, were deposited on γ-alumina (γ-Al2O3) using the impregnation method; then, copper oxide was also supported on them by employing the impregnation method. For comparison, CuO/γ-Al2O3 catalysts were prepared in this work. The catalysts were characterized by temperature-programmed reduction (TPR) and X-ray diffraction (XRD). For CuO/γ-Al2O3 catalysts, two TPR peaks, namely β and γ, were observed. These have been attributed to the reduction of highly dispersed copper oxide species and bulk-like copper oxide, respectively. For CuO/CeO2/γ-Al2O3 and CuO/YDC/γ-Al2O3 catalysts, four TPR peaks, namely α1, α2, β′ and γ′, could be observed. The α peaks with lower peak temperatures as compared to those of β′ and γ′ peaks have been attributed to the reduction of interface-boundary copper oxide species that contact closely and interact strongly with the supported ceria or YDC. Crystal sizes calculated from XRD measurements confirmed that yttria (Y2O3) addition could lead to crystal growth of ceria and correspondingly enhance the dispersion of the supported copper oxide due to the partition of YDC crystallite. Hence, this work shows that supported YDC and ceria can act bi-functionally as a textural promoter as well as a structural promoter.

162 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of yttria doping on the metal-support interface of Ni/γ-Al 2 O 3 and YDC-doped ceria-based catalysts was investigated.
Abstract: Carbon dioxide reforming of methane was studied over Ni supported on ceria and yttria-doped ceria (YDC) to seek insight into the effect of catalysis at the metal–support interface. In contrast to the performance of Ni/γ-Al 2 O 3 , which displayed very rapid deactivation with time on stream, the rate over the ceria- or YDC-supported catalysts exhibited exceptional enhancement of activity and coking resistivity. The extent of enhancement decreased with increased yttria loading. The enhancement of activity and coking resistivity of the ceria-based catalysts, coupled with the results of temperature-programmed reduction and hydrogenation, suggested the formation of interfacial active centers and the existence of metal–support interaction, which decreased with increased yttria loading. EPR and XPS results provided evidence that the ability of CeO 2 to lose its lattice oxygen to form Ce 3+ was inhibited with yttria doping. The lattice oxygen of ceria is inferred to have played some positive role in the activation of both CH 4 and CO 2 ; such promotion is attributed in part to the availability of Ce 3+ species at the metal–support interface.

102 citations

Journal ArticleDOI
TL;DR: In this paper, Zhou et al. showed that surface oxygen vacancies of YSZ support can enhance the activity of copper catalysts by improving the dispersion and stabilizing the interfacial Cu2O through the oxygen vacancies.

83 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the kinetics and mechanism of CO oxidation on single and mixed oxides are examined, alongside the catalyst structures, in a review of the literature on carbon monoxide over oxide catalysts.
Abstract: Oxidation into CO2 is a major solution to CO abatement in air depollution treatments. The development of catalytic converters led to an extraordinary high number of publications on metal catalysts during the last fifty years. Due to the increasing price of noble metals and to remarkable progresses in oxide syntheses, catalytic oxidation of carbon monoxide over oxide catalysts has recently gained in interest, even if some oxides are known to present remarkable activity since the beginning of the 20th century. In this Review, the kinetics and mechanism of CO oxidation on single and mixed oxides are examined, alongside the catalyst structures

821 citations

Journal ArticleDOI
TL;DR: The antibacterial activity of CuO nanoparticles was found to be size-dependent and the highly stable minimum-sized monodispersed copper oxide nanoparticles synthesized during this study demonstrated a significant increase in antibacterial activities against both Gram-positive and -negative bacterial strains.
Abstract: Background CuO is one of the most important transition metal oxides due to its captivating properties. It is used in various technological applications such as high critical temperature superconductors, gas sensors, in photoconductive applications, and so on. Recently, it has been used as an antimicrobial agent against various bacterial species. Here we synthesized different sized CuO nanoparticles and explored the size-dependent antibacterial activity of each CuO nanoparticles preparation.

620 citations

Journal ArticleDOI
TL;DR: In this article, transition metal oxide nanoparticles have been synthesized sonochemically from metal acetates using X-ray diffraction (XRD), diffuse reflection spectroscopy (DRS), transmission electron microscopy (TEM), and BET nitrogen adsorption.
Abstract: Transition metal oxide nanoparticles have been synthesized sonochemically from metal acetates. The metal oxide nanoparticles are characterized using X-ray diffraction (XRD), diffuse reflection spectroscopy (DRS), transmission electron microscopy (TEM), and BET nitrogen adsorption. The results of DRS are analyzed in detail, and the band gap energies for CuO, ZnO, and Co3O4 are seen to be 2.18, 3.35, and 2.26 (3.40), respectively. Different particle sizes, morphology, and yields are observed when water and 10% water−N,N-dimethylformamide (DMF) are used as solvents, and the possible mechanisms are discussed.

568 citations

Journal ArticleDOI
TL;DR: In this paper, as-prepared CuO nanoparticles with an average size of ca. 4nm have been successfully prepared by microwave irradiation, using copper (II) acetate and sodium hydroxide as the starting materials and ethanol as the solvent.

507 citations

Journal ArticleDOI
TL;DR: In this article, the development of CO2 reforming for syngas production is reviewed, covering process chemistry, catalyst development, and process technologies as well as the potential future direction for this process.
Abstract: The mitigation and utilization of greenhouse gases, such as carbon dioxide and methane, are among the most important challenges in the area of energy research. Dry reforming of CH4 (DRM), which uses both CO2 and CH4 as reactants, is a potential method to utilize the greenhouse gases in the atmosphere. Natural gas containing high concentrations of CO2 and CH4 could therefore be utilized for hydrogen and synthesis gas (syngas) production in the near future, without need for the removal of CO2 from the source gas. Thus, the DRM reaction is a suitable process to convert CH4 and CO2 to syngas, which is a raw material for liquid fuel production, through the Fischer–Tropsch process. Herein, the development of CO2 reforming for syngas production is reviewed, covering process chemistry, catalyst development, and process technologies as well as the potential future direction for this process.

496 citations