Difference in the deactivation of Au catalysts during ethanol transformation when supported on ZnO and on TiO<sub>2</sub>

Morales, M.V.; Asedegbega–Nieto, Esther; Castillejos, Eva; Bachiller‐Baeza, B.; Guerrero-Ruı́z, A.

doi:10.1039/c8ra00314a

Cited by 10 publications

(11 citation statements)

References 65 publications

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“…These data confirm that copper-based catalysts can give rise to high yields in acetaldehyde also at high conversion, in contrast to what is mainly observed with noble metal catalysts that give rise to even 100% selectivities but only at a moderate to low conversion, while deactivation is a common problem [36].…”

Section: Ethanol To Acetaldehyde By Dehydrogenationsupporting

confidence: 77%

Heterogeneous Catalysis in (Bio)Ethanol Conversion to Chemicals and Fuels: Thermodynamics, Catalysis, Reaction Paths, Mechanisms and Product Selectivities

et al. 2020

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In gas/solid conditions, different chemicals, such as diethylether, ethylene, butadiene, higher hydrocarbons, acetaldehyde, acetone and hydrogen, can be produced from ethanol with heterogeneous catalytic processes. The focus of this paper is the interplay of different reaction paths, which depend on thermodynamic factors as well as on kinetic factors, thus mainly from catalyst functionalities and reaction temperatures. Strategies for selectivity improvements in heterogeneously catalyzed processes converting (bio)ethanol into renewable chemicals and biofuels are also considered.

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Section: Ethanol To Acetaldehyde By Dehydrogenationsupporting

confidence: 77%

Heterogeneous Catalysis in (Bio)Ethanol Conversion to Chemicals and Fuels: Thermodynamics, Catalysis, Reaction Paths, Mechanisms and Product Selectivities

et al. 2020

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“…Various catalysts for ethanol dehydrogenation have been proposed in the literature 27–37. Gold catalysts have been tested on a variety of supports such as SiO 2 27, mixed oxide ZnZrO x 28, ZnO, and TiO 2 29. These catalysts have high activity and selectivity at low temperatures and low conversion.…”

Section: Introductionmentioning

confidence: 99%

“…These catalysts have high activity and selectivity at low temperatures and low conversion. Deactivation was found due to the carbon deposition that is more pronounced for catalysts supported on TiO 2 29. Pd‐based catalysts supported on ZnO were tested in the dehydrogenation of ethanol at low temperatures with a long contact time, but a low yield of acetaldehyde was achieved 30.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ni, La, and Ce Oxides on a Cu/Al₂O₃ Catalyst with Low Copper Loading for Ethanol Non‐oxidative Dehydrogenation

et al. 2021

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The effect of modifying additives (Ni, La, Ce oxides) on the activity of Cu/Al2O3 with a low copper loading was studied for ethanol non‐oxidative dehydrogenation. The catalysts were prepared by impregnation of the commercial Al2O3 granules and characterized by Brunauer‐Emmett‐Teller (BET), scanning electron microscopy (SEM), temperature‐programmed desorption of NH3 (TPD‐NH3), temperature‐programmed reduction of H2 (H2‐TPR), and thermogravimetric analysis (TGA). Modification of Cu/Al2O3 with Ni, La, and Ce oxides results in increasing catalytic activity. A modification of the Cu/Al2O3 catalyst with nickel and lanthanum oxides, in contrast to cerium oxide, leads to an improvement in the dispersion of the catalyst particles. The Cu‐Ni/Al2O3 catalyst with the highest acidity has the highest selectivity for acetaldehyde. The highest selectivity for butanol is observed for the Cu‐La/Al2O3 catalyst, which has the lowest acidity.

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“…They reported that catalyst deactivation was merely motived by coke deposition, remarkably via encapsulating coke inside of the catalyst. In addition, Morales et al [17] also investigated the difference in deactivation of Au catalyst during transformation when supported on ZnO and TiO 2 . The evidence suggested that the catalyst on ZnO demonstrated higher resistance to deactivation caused by coke formation.…”

Section: Introductionmentioning

confidence: 99%

Study of Deactivation in Mesocellular Foam Carbon (MCF-C) Catalyst Used in Gas-Phase Dehydrogenation of Ethanol

Klinthongchai

Prichanont

Praserthdam

et al. 2021

Preprint

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Mesocellular foam carbon (MCF-C) is one the captivating materials for using in gas phase dehydrogenation of ethanol. Extraordinary, enlarge pore size, high surface area, high acidity, and spherical shape with interconnected pore for high diffusion. In contrary, the occurrence of the coke is a majority causes for inhibiting the active sites on catalyst surface. Thus, this study aims to investigate the occurrence of the coke to optimize the higher catalytic activity, and also to avoid the coke formation. The MCF-C was synthesized and investigated using various techniques. MCF-C was spent in gas-phase dehydrogenation of ethanol under mild conditions. The deactivation of catalyst was investigated toward different conditions. Effects of reaction condition including different reaction temperatures of 300, 350, and 400 °C on the deactivation behaviors were determined. The results indicated that the operating temperature at 400 ºC significantly retained the lowest change of ethanol conversion, which favored in the higher temperature. After running reaction, the physical properties as pore size, surface area, and pore volume of spent catalysts were decreased owing to the coke formation, which possibly blocked the pore that directly affected to the difficult diffusion of reactant and caused to be lower in catalytic activity. Furthermore, a slight decrease in either acidity or basicity was observed owing to consumption of reactant at surface of catalyst or chemical change on surface caused by coke formation. Therefore, it can remarkably choose the suitable operating temperature to avoid deactivation of catalyst, and then optimize the ethanol conversion or yield of acetaldehyde.

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Difference in the deactivation of Au catalysts during ethanol transformation when supported on ZnO and on TiO₂

Abstract: Au NPs of different sizes were supported on two metal oxides: ZnO and TiO2. Differences in ethanol transformation for Au of similar particle size reveal that TiO2 support induces condensation products while ZnO only gives place to dehydrogenation.

Cited by 10 publications

References 65 publications

Heterogeneous Catalysis in (Bio)Ethanol Conversion to Chemicals and Fuels: Thermodynamics, Catalysis, Reaction Paths, Mechanisms and Product Selectivities

Heterogeneous Catalysis in (Bio)Ethanol Conversion to Chemicals and Fuels: Thermodynamics, Catalysis, Reaction Paths, Mechanisms and Product Selectivities

Effect of Ni, La, and Ce Oxides on a Cu/Al₂O₃ Catalyst with Low Copper Loading for Ethanol Non‐oxidative Dehydrogenation

Study of Deactivation in Mesocellular Foam Carbon (MCF-C) Catalyst Used in Gas-Phase Dehydrogenation of Ethanol

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Difference in the deactivation of Au catalysts during ethanol transformation when supported on ZnO and on TiO2

Abstract: Au NPs of different sizes were supported on two metal oxides: ZnO and TiO2. Differences in ethanol transformation for Au of similar particle size reveal that TiO2 support induces condensation products while ZnO only gives place to dehydrogenation.

Cited by 10 publications

References 65 publications

Heterogeneous Catalysis in (Bio)Ethanol Conversion to Chemicals and Fuels: Thermodynamics, Catalysis, Reaction Paths, Mechanisms and Product Selectivities

Heterogeneous Catalysis in (Bio)Ethanol Conversion to Chemicals and Fuels: Thermodynamics, Catalysis, Reaction Paths, Mechanisms and Product Selectivities

Effect of Ni, La, and Ce Oxides on a Cu/Al2O3 Catalyst with Low Copper Loading for Ethanol Non‐oxidative Dehydrogenation

Study of Deactivation in Mesocellular Foam Carbon&nbsp;(MCF-C) Catalyst Used in Gas-Phase Dehydrogenation of Ethanol

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Difference in the deactivation of Au catalysts during ethanol transformation when supported on ZnO and on TiO₂

Effect of Ni, La, and Ce Oxides on a Cu/Al₂O₃ Catalyst with Low Copper Loading for Ethanol Non‐oxidative Dehydrogenation

Study of Deactivation in Mesocellular Foam Carbon (MCF-C) Catalyst Used in Gas-Phase Dehydrogenation of Ethanol