Design of Binary Nb2O5–SiO2 Self-Standing Monoliths Bearing Hierarchical Porosity and Their Efficient Friedel–Crafts Alkylation/Acylation Catalytic Properties

Ly, Isabelle; Layan, Elodie; Picheau, Emmanuel; Chanut, Nicolas; Nallet, Frédéric; Bentaleb, Ahmed; Dourges, Marie-Anne; Pellenq, Roland J.‐M.; Hillard, Elizabeth A.; Toupance, Thierry; Dole, François; Backov, Rénal

doi:10.1021/acsami.1c24554

Cited by 7 publications

(29 citation statements)

References 43 publications

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“…The diffraction patterns were generated with a TEM FEI Talos F200S 200 kV. Regarding the coupled TEM–TED investigations, image acquisitions followed the procedure reported in ref .…”

Section: Methodsmentioning

confidence: 80%

“…The physisorption measurements followed the same procedure as that presented in ref while using a Micromeritics 3Flex surface characterization analyzer (Micromeritics Instrument Corp, Norcross, GA).…”

Section: Methodsmentioning

confidence: 80%

“…The native materials were dried in a desiccator for 1 week, followed with a second 3 days of drying in air. Finally, a thermal treatment was applied to the materials following the same conditions as presented in the literature . Final micro–meso–macroporous monoliths are labeled MUB-100(1), MUB-100(2), MUB-100(3), and MUB-100(4), indicating an increasing amount of cobalt employed for the syntheses (Table ).…”

Section: Methodsmentioning

confidence: 99%

“…Materials skeleton densities have been determined through the same procedure and apparatus as described in ref .…”

Section: Methodsmentioning

confidence: 99%

“…They are thus outstanding candidates for liquid or gaseous phase heterogeneous catalysis. Particularly, the heterogeneous oxidation of CO is nowadays the most efficient gas exhaust remediation process where almost all the commercial catalysts make use of noble metals because of their high activity for CO oxidation and stability. − However, it is well-known that the major drawbacks of noble metals are their scarcity and associated high and increasing cost. , Consequently, several studies have been reported on the development of non-noble transition metal-based catalysts for CO oxidation, ,− where cobalt oxides, Co 3 O 4 especially, represent promising candidates. , In this vein, we are proposing the design of the first CoOx–SiO 2 (HIPE) multiscale porous monolithic MUB-100 materials (MUB stands for “Materials of the University of Bordeaux”) and present their characterization and specific applications as highly efficient heterogeneous catalysts toward CO oxidation.…”

Section: Introductionmentioning

confidence: 99%

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Binary CoOx–SiO₂ Porous Nanostructures for Catalytic CO Oxidation

Vardon

Chanut

et al. 2022

ACS Appl. Nano Mater.

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Via integrative chemistry, the first CoOx–SiO2(HIPE) self-standing monoliths of cobalt nano-oxides embedded within silica macro–mesocellular hosts have been prepared. These binary CoOx–SiO2 porous nanostructure (MUB-100(x)) materials present an average of 95% porosity. We found out that high cobalt concentration maintains the hexagonal-2D organization of the mesoscopic voids when applying the thermal treatment at 700 °C. Their specific surface areas fall between 400 and 500 m2 g–1 when assessed by Ar physisorption measurements. At the microscopic length scale, as revealed through magnetic investigations, the low cobalt content foams MUB-100(1) and MUB-100(2) are made of the amorphous β-Co(OH)2 phase coexisting with the silica network, whereas increasing the cobalt concentration during the one-pot syntheses (MUB-100(3) and MUB-(4) materials) favors the formation of the spinel Co3O4 and olivine Co2SiO4 crystalline nanoparticles embedded within silica. When considering the CO oxidation catalytic performance, the MUB-100(4) is able to totally convert the CO flow before 200 °C (starting at 125 °C) while achieving 50% conversion for a light-off temperature (T 50) of 145 °C, revealing the good efficiency of the MUB-100(4) in CO oxidation with which up to 4 catalytic cycles have been performed without disrupting drastically the catalytic performance and reaching thermodynamic stability from cycle 2 to cycle 4.

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“…The diffraction patterns were generated with a TEM FEI Talos F200S 200 kV. Regarding the coupled TEM–TED investigations, image acquisitions followed the procedure reported in ref .…”

Section: Methodsmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 80%

Section: Methodsmentioning

confidence: 99%

“…Materials skeleton densities have been determined through the same procedure and apparatus as described in ref .…”

Section: Methodsmentioning

confidence: 99%