Improved activity and stability of Pd@CeO2 core–shell catalysts hybridized with multi-walled carbon nanotubes in the water gas shift reaction

Beltram, Alessandro; Melchionna, Michele; Montini, Tiziano; Nasi, L.; Gorte, Raymond J.; Prato, Maurizio; Fornasiero, Paolo

doi:10.1016/j.cattod.2015.03.032

Cited by 36 publications

(20 citation statements)

References 44 publications

(53 reference statements)

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“…The first frequency represents the doubly degenerate TO mode (272 cm −1 ) due to displacement of oxygen atoms from their ideal fluorite lattice positions, though shifted to lower energy (265 cm −1 ) . The other two peaks correspond to the strongest bands of CuO, something that is not clearly evidenced from our XRD findings for these samples. These Raman peaks can be attributed to small CuO clusters with structures so loose that they have no specific and regular arrangement, therefore escaping the XRD detection.…”

Section: Resultsmentioning

confidence: 99%

A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation

et al. 2018

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Copper oxide nanoparticles were dispersed onto the surface of ceria nanorods, while a post‐synthesis modification was applied to the reference sample using ammonia solutions. The modified catalysts were characterized with a variety of analytical techniques, providing useful information on the effect of the Cu:NH3 ratio, employed in the modification step, on the physicochemical properties. Re‐dispersion of the active copper species under extremely basic conditions promoted the reducibility and the oxygen mobility of the catalyst, thus resulting in a more active and selective catalyst for preferential CO oxidation.

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Section: Resultsmentioning

confidence: 99%

A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation

et al. 2018

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“…41 To overcome these problems, Pd@CeO 2 /MWCNT hybrid materials have been synthesized, observing that the balance between the organic and inorganic components favors their electronic interaction, nally leading to stable catalytic performances in the WGSR. 42 To investigate the origin of deactivation observed in the Pt/CeO 2 catalysts supported on SBA-16, the materials aer catalytic tests have been characterized in detail with a view to highlight differences induced by prolonged aging under WGSR conditions. Also in this case, SEM coupled with EDX does not evidence the segregation of the Pt/CeO 2 active phase outside the SBA-16 (see ESI Fig.…”

Section: Wgsr Activitymentioning

confidence: 99%

The water gas shift reaction over Pt–CeO₂ nanoparticles confined within mesoporous SBA-16

et al. 2017

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Novel nanocomposite catalysts for the single step Water Gas Shift Reaction (WGSR) were prepared by deposition–precipitation and impregnation of Pt–CeO2 nanophases onto an ordered mesoporous silica support featuring a cubic arrangement of mesopores (SBA-16 type). The highly interconnected porosity of the SBA-16 developed in three dimensions (3D) provides a scaffold which is easily accessible to reactants and products by diffusion. The textural and morphological properties of the final catalyst were affected by the procedure utilized for dispersion of the nanophases onto SBA-16. The catalysts prepared by deposition–precipitation present highly dispersed nanocrystalline CeO2 on the surface of SBA-16 and retain a high surface area, high thermal stability and high Pt accessibility. The catalysts prepared by impregnation show improved Pt–CeO2 interaction but a more significant decrease of surface area compared to pure SBA-16, due to the confinement of the CeO2 crystallites within the mesoporous matrix. As a result, the catalysts prepared by deposition–precipitation are effective for the WGSR under working conditions in the high temperature range (around 300–350 °C), whereas the catalysts prepared by impregnation are suitable for the process operating at low temperature. Our results point out that these catalyst preparation procedures can be used to optimise the performance of heterogenous catalysts, by controlling the CeO2 crystallite size and optimizing the Pt–CeO2 contact by embedding. Improved thermal and chemical stabilities were achieved using a mesoporous scaffold

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“…102 We also recently demonstrated how the system may be further improved for the specific process by means of thermal treatments, and how the homogeneity of the catalyst, which depends on the relative composition, is an essential parameter to consider during the catalyst formulation phase. 103 The NM@MO x phase can also feature the same transition metal. In a latest example, a remarkable activity for electrocatalytic hydrogen evolution, comparable to that of platinum, was reported for a catalyst consisting on Ni@NiO/CNT.…”

Section: Hierarchical Systemsmentioning

confidence: 99%

“…However, because of the absence of the MWCNT scaffold, the system paid a high price in terms of stability, with rapid deactivation already at low operational temperature (200 °C). 103 The template effect and the possibility of removing most of the carbon is a powerful tool for the design of metal-based materials with restricted morphology. The geometrical characteristics are expected to play a pivotal role in many catalytic processes, in particular given the possibility to create hollow architectures.…”

Section: Removable Templatesmentioning

confidence: 99%

Carbon nanotubes and catalysis: the many facets of a successful marriage

Melchionna

Marchesan

Prato

et al. 2015

Catal. Sci. Technol.

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118

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Carbon nanotubes have emerged as unique carbon allotropes that bear very interesting prospects in catalysis. Their use is mostly related to that of supports for inorganic metal catalysts, including molecular catalysts, metal nanoparticles, metal oxides or even more complex hierarchical hybrids. However, several reports have shown that they can intriguingly act as metal-free catalysts, with performance often superior to that of other carbon materials, in particular when ad hoc organic functional groups are attached prior to catalytic screening. The range of catalytic reactions is quite wide, and it includes standard organic synthesis, electrocatalysis, photocatalysis as well as other important industrial processes. In the last few years, the energy sector has acquired a dominant role as one of the most sought-after fields of application, given its ever-increasing importance in society

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Improved activity and stability of Pd@CeO2 core–shell catalysts hybridized with multi-walled carbon nanotubes in the water gas shift reaction

Cited by 36 publications

References 44 publications

A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation

A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation

The water gas shift reaction over Pt–CeO₂ nanoparticles confined within mesoporous SBA-16

Carbon nanotubes and catalysis: the many facets of a successful marriage

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Improved activity and stability of Pd@CeO2 core–shell catalysts hybridized with multi-walled carbon nanotubes in the water gas shift reaction

Cited by 36 publications

References 44 publications

A Novel Post‐Synthesis Modification of CuO‐CeO2 Catalysts: Effect on Their Activity for Selective CO Oxidation

A Novel Post‐Synthesis Modification of CuO‐CeO2 Catalysts: Effect on Their Activity for Selective CO Oxidation

The water gas shift reaction over Pt–CeO2 nanoparticles confined within mesoporous SBA-16

Carbon nanotubes and catalysis: the many facets of a successful marriage

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Product

Resources

About

A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation

A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation

The water gas shift reaction over Pt–CeO₂ nanoparticles confined within mesoporous SBA-16