Protecting a Pd/CB catalyst by a mesoporous silica layer

Protecting a Pd/CB catalyst by a mesoporous silica layer

[Display omitted] •Pd nanoparticles supported on carbon black were encapsulated by mesoporous silica.•The 3D nature of interconnecting pores was confirmed by electron tomography.•The covered catalyst resists sintering but the underlying active phase is accessible.•The catalyst is performant in gluco...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2019-02, Vol.241, p.196-204
Main Authors: Haynes, Tommy, Ersen, Ovidiu, Dubois, Vincent, Desmecht, Didier, Nakagawa, Keizo, Hermans, Sophie
Format: Article
Language:eng
Subjects:
Anchoring
Black carbon
Carbon
Carbon black
Catalysis
Catalysts
Catalytic activity
Catalytic oxidation
Chemical Sciences
Deactivation
Dehydrogenation
Gluconic acid
Glucose
Glucose oxidation
High temperature
Mesoporous silica
Nanoparticles
Palladium
Photocatalysis
Silica
Silicon dioxide
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Summary:[Display omitted] •Pd nanoparticles supported on carbon black were encapsulated by mesoporous silica.•The 3D nature of interconnecting pores was confirmed by electron tomography.•The covered catalyst resists sintering but the underlying active phase is accessible.•The catalyst is performant in glucose oxidation due to improved hydrophilicity. Palladium nanoparticles supported on carbon black were encapsulated in a thin mesoporous silica layer. APTES ((3-aminopropyl) trimethoxysilane) was used as anchoring agent to ensure robust and homogeneous formation of a mesoporous SiO2 layer around the supported catalyst. This was confirmed by XPS, TEM, electron tomography and nitrogen physisorption measurements. The covered catalyst was tested in the oxidative dehydrogenation of glucose into gluconic acid: the high catalytic activity was maintained in comparison with uncovered catalyst, indicating that the underlying active phase was still available. In addition, the silica layer leads to high temperature stability which prevents the agglomeration of palladium nanoparticles upon sintering conditions.
ISSN:0926-3373
1873-3883