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Hydrodeoxygenation of m-cresol with Pt supported over mild acid materials

Paper ID Volume ID Publish Year Pages File Format Full-Text
39618 45828 2014 10 PDF Available
Title
Hydrodeoxygenation of m-cresol with Pt supported over mild acid materials
Abstract

•High metal/acid sites ratio is required to avoid cracking.•Only a small density of acid sites is enough to obtain toluene.•A high density of acid sites leads to a faster coke formation.•Microporous structures are less convenient due to mouth pore blocking with coke.

The deoxygenation of m-cresol was studied using Pt catalysts supported on different materials of various levels of acidity, such as gamma alumina, silica, and H-BEA zeolites. The reaction was carried out at atmospheric pressure and 300 °C in a fixed-bed reactor. The catalysts were characterized by XRD, BET, TPR, TEM, H2 and CO chemisorptions, pyridine-TPD and pyridine-IR. The (metal function/acid function) ratio and the reaction conditions were adjusted in order to have a high selectivity to toluene. The effects of acid sites density, strength and type, as well as the pore structure of the different supports on the deoxygenation activity, selectivity and stability were addressed. In order to avoid the production of heavy products and a fast deactivation, the concentration of Brønsted acid sites must be very low. A high acid sites density is detrimental for catalyst stability, due to coke formation via condensation of precursors adsorbed on adjacent sites. Additionally, a mesoporous structure is better than a microporous structure regarding the stability. All the catalysts can be regenerated in air at relatively low temperature.

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Keywords
Hydrodeoxygenation; Cresol; Beta zeolite; Alumina; Silica; Platinum
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 482, 22 July 2014, Pages 352–361
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us