Catalyst design using an inverse strategy: From mechanistic studies on inverted model catalysts to applications of oxide-coated metal nanoparticles

Zhang, Jing; Medlin, J. Will

doi:10.1016/j.surfrep.2018.06.002

Cited by 69 publications

(75 citation statements)

References 289 publications

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“…However, one has to be aware that the system VO x / Pt(111) represents an inverse model catalyst and not the actual supported catalyst used in industrial catalysis. Since the concept of inverse supported catalysts has also been applied to design novel type of catalysts, knowledge of the processes encountered here with VO x /Pt(111) might be useful for constructing such catalysts [38].…”

Section: Segregation Behavior Of Vo X /Pt(111)mentioning

confidence: 99%

“…The concept of depositing oxides onto a metal support instead of having small metal particles sitting on an oxidic support, as it is the case for the supported catalysts used in industry, has been termed inverse model catalyst approach [22,[35][36][37][38]. Besides practical advantages such as avoiding electrical charging of the sample, this concept has been used to study processes at the metal/oxide interface, and to investigate a group of phenomena summarized under the term strong metal support interaction (SMSI).…”

Section: Introductionmentioning

confidence: 99%

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Reactivity and Stability of Ultrathin VOx Films on Pt(111) in Catalytic Methanol Oxidation

2020

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The growth of ultrathin layers of VOx (< 12 monolayers) on Pt(111) and the activity of these layers in catalytic methanol oxidation at 10−4 mbar have been studied with low-energy electron diffraction, Auger electron spectroscopy, rate measurements, and with photoemission electron microscopy. Reactive deposition of V in O2 at 670 K obeys a Stranski–Krastanov growth mode with a (√3 × √3)R30° structure representing the limiting case for epitaxial growth of 3D-VOx. The activity of VOx/Pt(111) in catalytic methanol oxidation is very low and no redistribution dynamics is observed lifting the initial spatial homogeneity of the VOx layer. Under reaction conditions, part of the surface vanadium diffuses into the Pt subsurface region. Exposure to O2 causes part of the V to diffuse back to the surface, but only up to one monolayer of VOx can be stabilized in this way at 10−4 mbar.

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Section: Segregation Behavior Of Vo X /Pt(111)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reactivity and Stability of Ultrathin VOx Films on Pt(111) in Catalytic Methanol Oxidation

2020

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“…In the field of heterogeneous catalysis, the use of core-shell catalysts as single unit with different components has been previously reported [25,26,27]. For CAL hydrogenation, Song et al has reported the use of a Pt@CeO 2 nanocatalyst achieving over 95% conversion with 87% selectivity to HCAL in 5 h under 1 atm H 2 pressure [28].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Fe2O3–SiO2–MeO2–Pt (Me = Ti, Sn, Ce) as Catalysts for the Selective Hydrogenation of Cinnamaldehyde. Effect of the Nature of the Metal Oxide

et al. 2019

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The type of metal oxide affects the activity and selectivity of Fe2O3–SiO2–MeO2–Pt (Me = Ti, Sn, Ce) catalysts on the hydrogenation of cinnamaldehyde. The double shell structure design is thought to protect the magnetic Fe2O3 cores, and also act as a platform for depositing a second shell of TiO2, SnO2 or CeO2 metal oxide. To obtain a homogeneous metallic dispersion, the incorporation of 5 wt % of Pt was carried out over Fe2O3–SiO2–MeO2 (Me = Ti, Sn, Ce) structures modified with (3-aminopropyl)triethoxysilane by successive impregnation-reduction cycles. The full characterization by HR-TEM, STEM-EDX, XRD, N2 adsorption isotherm at −196 °C, TPR-H2 and VSM of the catalysts indicates that homogeneous core-shell structures with controlled nano-sized magnetic cores, multi-shells and metallic Pt were obtained. The nature of the metal oxide affects the Pt nanoparticle sizes where the mean Pt diameter is in the order: –TiO2–Pt > –SnO2–Pt > –CeO2–Pt. Among the catalysts studied, –CeO2–Pt had the best catalytic performance, reaching the maximum of conversion at 240 min. of reaction without producing hydrocinnamaldehyde (HCAL). It also showed a plot volcano type for the production of cinnamic alcohol (COL), with 3-phenyl-1-propanol (HCOL) as a main product. The –SnO2–Pt catalyst showed a poor catalytic performance attributable to the Pt clusters’ occlusion in the irregular surface of the –SnO2. Finally, the –TiO2–Pt catalyst showed a continuous production of COL with a 100% conversion and 65% selectivity at 600 min of reaction.

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“…In addition, the catalytic behaviors of metal/metal oxide catalysts can be varied depending on the choice of metal oxide materials as supports by providing dissimilar metal/metal oxide interface sites as well as the participation of metal oxides in the catalytic reaction. Alternatively, the metal oxide can be deposited on metal particles (metal oxide/metal) which is often referred to as an inverse catalyst [83][84][85][86]. These metal oxide/metal systems have been studied to elucidate the contribution of the metal oxide interface on catalytic activity since the 1940s [83][84][85][86].…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, the metal oxide can be deposited on metal particles (metal oxide/metal) which is often referred to as an inverse catalyst [83][84][85][86]. These metal oxide/metal systems have been studied to elucidate the contribution of the metal oxide interface on catalytic activity since the 1940s [83][84][85][86]. A large number of research groups have investigated inverse catalysts, and it has been reported that some inverse catalysts exhibit even higher activities than regularly structured catalysts (metal/metal oxides) consisting of the same compounds [84,87].…”

Section: Introductionmentioning

confidence: 99%

Atomic Layer Deposition for Preparation of Highly Efficient Catalysts for Dry Reforming of Methane

et al. 2019

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In this article, the structural and chemical properties of heterogeneous catalysts prepared by atomic layer deposition (ALD) are discussed. Oxide shells can be deposited on metal particles, forming shell/core type catalysts, while metal nanoparticles are incorporated into the deep inner parts of mesoporous supporting materials using ALD. Both structures were used as catalysts for the dry reforming of methane (DRM) reaction, which converts CO2 and CH4 into CO and H2. These ALD-prepared catalysts are not only highly initially active for the DRM reaction but are also stable for long-term operation. The origins of the high catalytic activity and stability of the ALD-prepared catalysts are thoroughly discussed.

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Catalyst design using an inverse strategy: From mechanistic studies on inverted model catalysts to applications of oxide-coated metal nanoparticles

Cited by 69 publications

References 289 publications

Reactivity and Stability of Ultrathin VOx Films on Pt(111) in Catalytic Methanol Oxidation

Reactivity and Stability of Ultrathin VOx Films on Pt(111) in Catalytic Methanol Oxidation

Magnetic Fe2O3–SiO2–MeO2–Pt (Me = Ti, Sn, Ce) as Catalysts for the Selective Hydrogenation of Cinnamaldehyde. Effect of the Nature of the Metal Oxide

Atomic Layer Deposition for Preparation of Highly Efficient Catalysts for Dry Reforming of Methane

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