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Influence of intimacy for metal-mesoporous solid acids catalysts for n-alkanes hydro-conversion

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Abstract

Pt on both ordered mesoporous Al-SBA-15 and commercial amorphous mesoporous silica–alumina bi-functional catalysts were prepared and studied for n-heptane hydro-isomerization and n-hexadecane hydro-cracking. We investigated the influence of the location of the Pt nanoparticles and their proximity to the acid sites; by depositing Pt in a controlled manner either in the mesopores of the solid acid or on a γ-Al2O3 binder, surrounding the solid acid particles. We demonstrate that in the case of both ordered and amorphous mesoporous acidic support, a distance between the metal and acid sites of a hundreds of nanometers gives similar results compared to the closest intimacy (below 10 nm) between these functions. Due to the medium strength Brønsted acid sites of the Al-SBA-15, Pt–Al-SBA-15 exhibits higher activity than the corresponding Pt on commercial amorphous silica–alumina. These results suggest that, in the case of mesoporous solid acids, a fine control at the nanoscale of the proximity between the active sites is less important than the number and nature of the acid sites.

Graphical abstract: Influence of intimacy for metal-mesoporous solid acids catalysts for n-alkanes hydro-conversion

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Article information


Submitted
11 Dec 2019
Accepted
04 Mar 2020
First published
06 Mar 2020

This article is Open Access

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Influence of intimacy for metal-mesoporous solid acids catalysts for n-alkanes hydro-conversion

J. Harmel, L. I. van der Wal, J. Zečević, P. E. de Jongh and K. P. de Jong, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/C9CY02510C

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