Direct synthesis of Cu supported on mesoporous silica: Tailoring the Cu loading and the activity for ethanol dehydrogenation

Finger, Pedro H.; Osmari, Taynara Andrea; Cabral, Natalia M.; Bueno, J.M.C.; Gallo, Jean Marcel R.

doi:10.1016/j.cattod.2020.10.019

Cited by 10 publications

(3 citation statements)

References 34 publications

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“…Thus, Cu/SiO2 catalysts are also suitable model materials to study the behaviour of Cu nanoparticles 9,21,22 . Using such approach, a marked structure-relationship was demonstrated 23 . Cu particle size strongly influence selectivity because it dictates the density of (catalytically active) coordinatively unsaturated sites, such as corners and kinks.…”

Section: Introductionmentioning

confidence: 99%

Ethanol dehydrogenation to acetaldehyde with mesoporous Cu-SiO2 catalysts prepared by aerosol-assisted sol–gel

Pampararo

Garbarino

Riani

et al. 2023

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Ethanol dehydrogenation to acetaldehyde with mesoporous Cu-SiO2 catalysts prepared by aerosol-assisted sol–gel

Pampararo

Garbarino

Riani

et al. 2023

Chemical Engineering Journal

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“…Zhou's group reported the preparation of a CuO/KIT-6 catalyst by the excess impregnation method with a particle size of 9.6 nm [13]. Gallo's group reported the synthesis of copper supported on MCM-41 by a one-pot methodology [14]. A catalyst with 10 wt% Cu exhibited a small particle size (1.8 nm) and displayed an ethanol conversion of 90% and acetaldehyde selectivity of 90% at 300 • C. It was found that higher Cu loading could improve the overall conversion of ethanol, but selectivity to acetaldehyde formation significantly decreased.…”

Section: Introductionmentioning

confidence: 99%

Uniformly Dispersed Cu Nanoparticles over Mesoporous Silica as a Highly Selective and Recyclable Ethanol Dehydrogenation Catalyst

Hao

Zhao

et al. 2022

Catalysts

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Selective dehydrogenation of ethanol to acetaldehyde has been considered as an important pathway to produce acetaldehyde due to the atom economy and easy separation of acetaldehyde and hydrogen. Copper catalysts have attracted much attention due to the high activity of Cu species in O-H and C-H bonds oxidative cleavage, and low process cost; however, the size of the Cu nanoparticle is difficult to control since it is easily suffers from metal sintering at high temperatures. In this work, the Cu/KIT-6 catalyst exhibited an ultra-high metal dispersion of 62.3% prepared by an electrostatic adsorption method, due to the advantages of the confinement effect of mesoporous nanostructures and the protective effect of ammonia water on Cu nanoparticles. The existence of an oxidation atmosphere had a significant effect on the valence state of copper species and enhancing moderate acid sites. The catalyst treated by reduction and then oxidation possessed a moderate/weak acid site ratio of ~0.42 and a suitable proportion of Cu+/Cu0 ratio of ~0.53, which conceivably rendered its superior ethanol conversion of 96.8% and full acetaldehyde selectivity at 250 °C. The catalyst also maintained a high selectivity of >99% to acetaldehyde upon time-on-stream of 288 h.

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“…It can be prepared with a broad range of mesopore sizes organized in a hexagonal array separated by amorphous silica walls. [1] Due to the high surface area, periodic large pore, and thermally stable structure, siliceous MCM-41 found application for drug delivery, [2] adsorption, [3] immobilization of enzymes, [4] and catalysts, [5] support for metal nanoparticles used in biomedical [6] and catalytic applications, [7,8] among others.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Sn‐MCM‐41 at Low Temperature: Effect of the Synthesis Parameters on the Structural, Textural, and Catalytic Properties

et al. 2021

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In memory of Prof. Dr. Ulf Schuchardt, for his outstanding contribution to inorganic chemistry and catalysis.Sn containing MCM-41 has gained attention for catalytic applications due to the recent popularization of the Sn-Beta Zeolite as a water-compatible Lewis acid catalyst. In the synthesis of Sn containing MCM-41 at high temperature, it has been shown that the silica source, the type of base, and the temperature can affect the structural, textural, and catalytic properties. Herein, a sustainable synthesis of Sn-MCM-41 at low temperatures (25 to 75°C) and using the low (cetyltrimethylammonium bromide, CTAB)/SiO 2 molar ratio of 0.11 is proposed. It is also studied the effect of the synthesis temperature, reaction pH, nature of the base, and Sn loading in the structural, textural, and catalytic properties of Sn-MCM-41. Sn-MCM-41 synthesized with NH 4 OH as base presented XRD patterns typical for the MCM-41 structures, while the synthesis using tetramethylammonium hydroxide (TMAOH) led to porous materials with a low periodicity of the pores. Using both NH 4 OH or TMAOH as hydroxides allowed the introduction of Sn in the silica framework, although the materials prepared with TMAOH displayed a higher contribution of pentacoordinated and extraframework Sn. All the Sn-MCM-41 prepared in this work were active in converting glucose into fructose, showing performance superior to Sn-MCM-41 prepared at high temperature.

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Direct synthesis of Cu supported on mesoporous silica: Tailoring the Cu loading and the activity for ethanol dehydrogenation

Cited by 10 publications

References 34 publications

Ethanol dehydrogenation to acetaldehyde with mesoporous Cu-SiO2 catalysts prepared by aerosol-assisted sol–gel

Ethanol dehydrogenation to acetaldehyde with mesoporous Cu-SiO2 catalysts prepared by aerosol-assisted sol–gel

Uniformly Dispersed Cu Nanoparticles over Mesoporous Silica as a Highly Selective and Recyclable Ethanol Dehydrogenation Catalyst

Synthesis of Sn‐MCM‐41 at Low Temperature: Effect of the Synthesis Parameters on the Structural, Textural, and Catalytic Properties

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