Influence of acid-base properties of the support on the catalytic performances of Pt-based catalysts in a gas-phase hydrogenation of acetonitrile

Saad, Fatima Ez-Zahraa; Comparot, Jean-Dominique; Brahmi, Rachid; Bensitel, M.; Piraúlt-Roy, Laurence

doi:10.1016/j.apcata.2017.06.038

Cited by 32 publications

(22 citation statements)

References 79 publications

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“…Low pzc values essentially result in small metal particle size. As mentioned elsewhere, when the support surface is immersed into an electrolyte solution surface charges are developed. In particular, the carbon support charges emanate from oxygen species like −COOH, −OH and C=O groups.…”

Section: Resultsmentioning

confidence: 98%

“…The point of zero charge (pzc) of each carbon support is estimated by mass titration method . Figure shows the pzc values of the four carbon supports (before impregnation), and the resulted diameter of the metal particles and crystallite size after the preparation procedure, as estimated by TEM and XRD, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In a very concentrated suspension, the pH is ruled from the pzc of the solid and approaches the solid value . This behavior does not allow the strong interaction between the Pt complexes and the surface, resulting in low particles dispersion . The formation of Pt or Ru clusters tend to aggregate into dendritic structures during the reduction step and form larger crystallites.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Carbon Support on the Electrocatalytic Properties of Pt−Ru Catalysts

et al. 2019

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What prompted you to investigate this topic/problem?Pt-based electrocatalysts supportedo nc arbon substrates are widely used as anodic and/orc athodic electrodes in proton exchange membrane fuel cells (PEMFCs). Among all available carbon supports, Vulcan XC-72 is the mostused in PEMFCelectrodes. However,P EMFCs still suffer from the insufficient durability of their electrodes, owing to several degradation mechanisms for the Pt-based nanocrystallites such as metal particles detachment andd issolution, and carbon corrosion leading to a decreasei ne lectrode activity.W eb elieve that investigating novel carbon materials (e.g. carbon nanotubes, biochar,a nd graphene) as potential supports for Pt-based electrocatalysts is important in order to design better fuel cell electrodes. All of the aforementioned carbonm aterials are characterized by having sufficient specific surface area and high electronic conductivity and, thus, can be potential supports for Pt-based electrocatalysts.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of Carbon Support on the Electrocatalytic Properties of Pt−Ru Catalysts

et al. 2019

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“…Platinum-catalyzed hydrogenation of nitriles almost exclusively resulted in secondary [3,4,[71][72][73] or tertiary amines [74], but in some cases moderate primary amine selectivities (51-56%) were achieved over supported platinum catalysts, in the gas-phase hydrogenation of acetonitrile [75,76]. Thus, 51% or 56% selectivity to ethylamine was obtained over a 1% Pt/(Al 2 O 3 ) 0.25 (MgO) 0.75 [75] or a 1% Pt/CeO 2 catalyst [76], at 20% conversion of acetonitrile, at atmospheric pressure and 70 °C.…”

Section: Reductions Over Platinummentioning

confidence: 99%

Selective Heterogeneous Catalytic Hydrogenation of Nitriles to Primary Amines

Lévay

Hegedűs

2018

Period. Polytech. Chem. Eng.

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Primary amines are important intermediates, especially in the area of pharmaceutical, plastic and agrochemical industry. The heterogeneous catalytic hydrogenation of nitriles is one of the most frequently applied process for the synthesis of diverse amines. However, the control of the selectivity is a critical issue in this reaction. Over the past decade, many studies have been reported using heterogeneous transition metal catalysts for the selective reduction of nitriles to the corresponding primary amines. The type of the catalysts, especially, the chemical nature of metals in the catalysts is one of the most important factors to influence the selectivity, the reaction rate, and possibly also the reaction pathway and the deactivation of the catalyst. Thus, this review focuses on the heterogeneous transition metal catalysts and summarizes the recent developments achieved in the selective catalytic hydrogenation of nitriles to primary amines.

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“…AlSi15 (0.61 mmol g −1 ) is presenting the highest amount of acidity followed by AlSi10 (0.55 mmol g −1 ) and AlSi5 (0.52 mmol g −1 ) (calculated based on Figure 3). This result can be explained by the fact that alumina is amphoteric or slightly acidic and silica presents Brønsted acid sites [45], which leads to acidic mixed oxides. The temperature-programmed desorption of NH 3 allows quantifying the total amount of acid sites existing on the surface of the studied materials.…”

Section: Characterisation Of Catalyst Powdersmentioning

confidence: 99%

Total Oxidation of Dichloromethane over Silica Modified Alumina Catalysts Washcoated on Ceramic Monoliths

et al. 2018

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Silica modified alumina was used in this study for coating of a cordierite monolith substrate with two different channel densities. The performance of the prepared monolith catalysts was evaluated in catalytic total oxidation of dichloromethane before and after Pt impregnation. The characteristics similar to the powder form catalysts were kept rather successfully after washcoating the monolith as evidenced by electron microscopy (FESEM) and N2 physisorption. A dichloromethane (DCM) conversion of higher than 80% at 500 °C was reached over all the catalysts with 200 cpsi. The maximum conversion was obtained with the catalyst containing 10 mol % of silica. The total amount of major byproducts (CO, CH3Cl and CH2O) were slightly decreased by increasing the silica loading, and remarkably after Pt impregnation. After impregnation of Pt, the HCl yields were increased for two samples with the higher loading of silica (10 and 15 mol %) and reached the maximum when silica loading was 10%. Even though Pt impregnation did not significantly affect the DCM conversion, it improved the selectivity. Comparison between the two substrates (200 and 600 cpsi) evidenced that the key parameters of the monolith influencing the DCM oxidation are low value of open fraction area, hydraulic diameter, thermal integrity factor and high value of mechanical integrity factor and geometric surface area.

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Influence of acid-base properties of the support on the catalytic performances of Pt-based catalysts in a gas-phase hydrogenation of acetonitrile

Cited by 32 publications

References 79 publications

Effect of Carbon Support on the Electrocatalytic Properties of Pt−Ru Catalysts

Effect of Carbon Support on the Electrocatalytic Properties of Pt−Ru Catalysts

Selective Heterogeneous Catalytic Hydrogenation of Nitriles to Primary Amines

Total Oxidation of Dichloromethane over Silica Modified Alumina Catalysts Washcoated on Ceramic Monoliths

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