Citrate-mediated sol-gel synthesis of Al-substituted sulfated zirconia catalysts for α-pinene isomerization

Rabee, A, Durndell, L, Fouad, N, Frattini, L, Isaacs, M, Lee, A, Mekhemer, G, dos Santos, V, Wilson, K and Zaki, M 2018, 'Citrate-mediated sol-gel synthesis of Al-substituted sulfated zirconia catalysts for α-pinene isomerization', Molecular Catalysis, vol. 458, pp. 206-212.


Document type: Journal Article
Collection: Journal Articles

Title Citrate-mediated sol-gel synthesis of Al-substituted sulfated zirconia catalysts for α-pinene isomerization
Author(s) Rabee, A
Durndell, L
Fouad, N
Frattini, L
Isaacs, M
Lee, A
Mekhemer, G
dos Santos, V
Wilson, K
Zaki, M
Year 2018
Journal name Molecular Catalysis
Volume number 458
Start page 206
End page 212
Total pages 7
Publisher Elsevier
Abstract Solid acids are desirable heterogeneous catalysts for green chemistry, with zirconia and its sulfated analogues offering tunable Lewis/Brønsted character. A new route to sulfated ZrO2, and Al-substituted ZrO2 (SO4/AlxZrO2), via carbonization and calcination of metal citrate gels and their subsequent sulfation by (NH4)2SO4 is reported. Structural and acidic properties of these materials were characterized by XRD, Raman, XPS, TGA-MS, N2 porosimetry, and propylamine and pyridine titration. Parent and sulfated materials all adopted the tetragonal zirconia phase, with Al-substitution (evidenced by contraction of the zirconia lattice parameter) at between 0.383.50 wt% increasing the surface area but decreasing acid strength, accompanied by an overall increase in total acid site loading and Lewis character. Low Al concentrations enhance α-pinene isomerization activity by up to 50% due to the increased acid site loading, however the Turnover Frequency (TOF) remained constant indicating a common active site. The TOF decreased for Al concentrations >3.5 wt% due to a further fall in acid strength, manifest as higher selectivity to polycyclic versus monocyclic products.
Subject Catalysis and Mechanisms of Reactions
Keyword(s) Citrate mediated sol-gel
Sulfated zirconia
Terpenes
a-pinene
Solid acidity
DOI - identifier 10.1016/j.mcat.2017.10.029
Copyright notice © 2017 Elsevier B.V. All rights reserved.
ISSN 2468-8231
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 0 times in Scopus Article
Altmetric details:
Access Statistics: 8 Abstract Views  -  Detailed Statistics
Created: Thu, 21 Feb 2019, 12:10:00 EST by Catalyst Administrator
© 2014 RMIT Research Repository • Powered by Fez SoftwareContact us