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Synthesis of Pt/Al2O3 catalyst using mesoporous alumina prepared with a cationic surfactant

Paper ID Volume ID Publish Year Pages File Format Full-Text
53919 46989 2015 15 PDF Available
Title
Synthesis of Pt/Al2O3 catalyst using mesoporous alumina prepared with a cationic surfactant
Abstract

•Metal contributed more to the conversion while the acidity affected the selectivity.•Alumina with the highest population of AlV species only showed Lewis acidity.•Wormlike particles were in the alumina with the highest concentration of CTAB.•Surface area increased as CTAB concentration increased passing through a maximum.•Acid Brønsted sites at concentrations between 0.01 M and 0.075 M of CTAB were found.

Pt on alumina catalysts were studied when the texture of the alumina change by addition of a cationic surfactant cetyl-trimethyl ammonium bromide (CTAB). The mesoporous alumina was prepared using CTAB from 0.01 to 0.1 M. The surface area and pore volume increased as CTAB concentration increased passing through a maximum. After calcination at 300 °C, and 550 °C boehmite and γ-Al2O3 were found by XRD. After calcination at 800 °C, the transition between γ- and θ-Al2O3 was observed together with an increase of pore volume and pore diameter respect to the alumina without surfactant. The alumina prepared with the lowest concentration of CTAB showed the highest thermal stability. Brønsted and Lewis acidities were found on alumina samples having CTAB concentrations from 0 to 0.075 M. The sample of alumina with the highest CTAB concentration showed the highest population of pentahedral aluminum (AlV), Lewis acidity and a dense network of wormlike particles by SEM. After H2 reduction of these catalysts, sulfur that came from the alumina support weakened the function of Pt particles to hydrogenolysis reaction whereas the CTAB introduced Brønsted acid sites in the alumina increasing the isomerization reaction.

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Keywords
Mesoporous Al2O3; Pt/Al2O3; Sulfur, cetyl trimethyl ammonium bromide; n-Heptane; Hydroconversion
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Synthesis of Pt/Al2O3 catalyst using mesoporous alumina prepared with a cationic surfactant
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 250, 15 July 2015, Pages 72–86
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