The comparison of two classes of bifunctional SBA-15 supported platinum–heteropolyacid catalysts for the isomerization of n-hexane

Pinto, Teresa; Arquillière, Philippe; Niccolaï, Gerald P.; Lefèbvre, F.; Dufaud, Véronique

doi:10.1039/c5nj00453e

Cited by 16 publications

(9 citation statements)

References 37 publications

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“…Determination of structural characteristics (size, stacking and morphology) and location of MoS 2 phase on SBA-15 mesoporous matrix by HAADF-STEM has been reported (Girleanu et al, 2015). Also, that technique has been applied in the past to study dispersion of Pt impregnated on SBA-15 samples (Pinto et al, 2015).…”

Section: High-resolution Tem (Hr-tem) and High Angle Annular Dark Field-stem (Haadf-stem)mentioning

confidence: 99%

Improving platinum dispersion on SBA-15 by titania addition

Morales-Hernández¹,

Ujat²,

Pacheco-Sosa³

et al. 2019

Rev.Mex.Ing.Quim.

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Section: High-resolution Tem (Hr-tem) and High Angle Annular Dark Field-stem (Haadf-stem)mentioning

confidence: 99%

Improving platinum dispersion on SBA-15 by titania addition

Morales-Hernández¹,

Ujat²,

Pacheco-Sosa³

et al. 2019

Rev.Mex.Ing.Quim.

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“…Accordingly, a number of different acidic or neutral materials were used as carriers for HPAs, including activated carbon [14][15][16][17], zirconia [18][19][20], or other mesoporous supports (e.g. SBA-15, MCM-41) [21][22][23][24][25][26][27]. Nevertheless, silica is one of the most widespread carriers for HPAs that is attributed to its commercial availability, neutral or slightly acidic nature and tunable structure.…”

Section: Introductionmentioning

confidence: 99%

Continuous Flow Friedel–Crafts Alkylation Catalyzed by Silica Supported Phosphotungstic Acid: An Environmentally Benign Process

et al. 2021

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Six silica-supported phosphotungstic acid catalysts (PTA/SiO2) of different composition (20–70 wt% PTA content) have been synthesized and characterized by elemental analysis, BET, BJH, NH3-TPD methods, FT-IR spectroscopy of adsorbed pyridine and 1H MAS NMR techniques. The new composite catalysts were first applied in the Friedel–Crafts alkylation of toluene with 1-octene as a benchmark process under batch conditions in order to screen their activity and recyclability. The combined analytical techniques together with the catalytic studies enabled the identification of the main factors affecting the activity of the catalysts. Based on these preliminary experiments, the best performing catalyst system (50 wt% PTA/SiO2) was investigated in continuous flow mode using an in-house-made flow reactor. The thorough screening of the reaction conditions (temperature, toluene/1-octene molar ratio and flow rate) provided firm evidence that the 50 wt% PTA/SiO2 composite is highly active, selective and stable catalyst under mild reaction conditions even at elevated flow rate. Additionally, the catalyst used in the flow mode could successfully be regenerated and reused in the alkylation process.

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“…However, the weak interaction of POMs with some support materials such as MCM-41 and SBA-15 leads to their partial leaching during the catalytic reactions. [23,24] Montmorillonite (MMT), a low-cost and easily available solid with several excellent properties, is a natural, layered clay possessing a large surface area as well as high cation exchange capacity. It has been extensively used in a variety of industries.…”

Section: Introductionmentioning

confidence: 99%

“…However, the weak interaction of POMs with some support materials such as MCM‐41 and SBA‐15 leads to their partial leaching during the catalytic reactions. [ 23,24 ]…”

Section: Introductionmentioning

confidence: 99%

A new nanocomposite catalyst based on clay‐supported heteropolyacid for the green synthesis of 2,4,5‐trisubstituted imidazoles

Masteri‐Farahani

Ezabadi

Mazarei

et al. 2020

Applied Organom Chemis

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Intercalation of cetyltrimethylammonium (CTA +) cations within the nanolayers of montmorillonite (MMT) clay followed by reaction with Keggin-type phosphomolybdic acid (PMo) resulted in the synthesis of (CTA) 3 PMo-MMT nanocomposite catalyst. The prepared nanocomposite catalyst was characterized using different physicochemical methods such as Fourier-transform infrared and inductively coupled plasma-optical emission spectroscopies, X-ray diffraction, and nitrogen adsorption-desorption (Brunauer-Emmett-Teller method) analyses. Characterization techniques demonstrated the intercalation of (CTA) 3 PMo species into the nanolayers of MMT. The resulting (CTA) 3 PMo-MMT nanocomposite catalyst efficiently catalyzed the synthesis of 2,4,5-trisubstituted imidazoles under solvent-free conditions. The efficiency is due to the fact that the presence of CTA + species makes the nanocomposite catalyst hydrophobic and facilitates the accessibility of hydrophobic reactants to active sites in the course of the reaction. High activity and selectivity were achieved in the presence of the prepared nanocomposite catalyst. The nanocomposite catalyst was readily isolated from the reaction mixture using simple filtration, washed with ethanol, and recycled five times without a major loss of activity.

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The comparison of two classes of bifunctional SBA-15 supported platinum–heteropolyacid catalysts for the isomerization of n-hexane

Abstract: SBA-15 supported bifunctional acidic HSiW–Pt catalysts proved to be active, stable and highly selective in the isomerization of n-hexane.

Cited by 16 publications

References 37 publications

Improving platinum dispersion on SBA-15 by titania addition

Improving platinum dispersion on SBA-15 by titania addition

Continuous Flow Friedel–Crafts Alkylation Catalyzed by Silica Supported Phosphotungstic Acid: An Environmentally Benign Process

A new nanocomposite catalyst based on clay‐supported heteropolyacid for the green synthesis of 2,4,5‐trisubstituted imidazoles

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