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Heteropolyacids supported on zirconia-doped γ, θ and α alumina: A physicochemical assessment and characterisation of supported solid acids

DOI: 10.1016/j.apsusc.2022.154696 DOI Help

Authors: Luke Forster (The University of Manchester) , Zhipeng Qie (The University of Manchester; Beijing University of Technology) , Min Hu (The University of Manchester) , Aristarchos Mavridis (The University of Manchester) , Cameron Price (The University of Manchester; Catalysis Hub, Research Complex at Harwell) , Christopher M. A. Parlett (The University of Manchester; Catalysis Hub, Research Complex at Harwell; Diamond Light Source; University of Manchester at Harwell) , Xiaolei Fan (The University of Manchester; Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute) , Carmine D'Agostino (The University of Manchester; Alma Mater Studiorum - Università di Bologna)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Applied Surface Science , VOL 605

State: Published (Approved)
Published: December 2022

Open Access Open Access

Abstract: In this paper we carry out a surface study of promising supported solid acid catalysts commonly used for the production of high value chemicals derived from glycerol. In particular, γ, θ and α alumina (Al2O3) were modified by (i) grafting with 5 wt% zirconia, (ii) doping with 30 wt% silicotungstic acid (STA), and (iii) using both zirconia and STA. The aim is to rationalise the effect of these different parameters on structural properties and surface adsorption through a comprehensive multi-technique approach, including recently developed NMR relaxation techniques. XRD and laser Raman spectroscopy confirmed a strong interaction between STA and the γ-/θ-Al2O3 resulting in a distortion of the supported STA Keggin structure relative to that of bulk STA. Conversely, a much weaker interaction between the supported STA and α-Al2O3 was measured. NMR relaxation demonstrated that the STA doping increases the adsorption properties of the catalyst, particularly for γ-/θ-Al2O3. For catalysts based on α-Al2O3, such effect was negligible. Thermogravimetric/differential thermogravimetry (TGA/DTG) analysis suggested that zirconia-grafted and non-grafted θ-Al2O3 and γ-Al2O3 are suitable materials for increasing the thermal stability of STA whereas α-Al2O3 (both grafted and non-grafted) does not improve the thermal stability of STA.

Journal Keywords: Heterogeneous Catalysis; Heteropolyacids; Alumina; Surface Chemistry; Low-Field NMR; NMR Relaxation

Subject Areas: Chemistry, Materials


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Added On: 07/09/2022 09:24

Documents:
1-s2.0-S0169433222022267-main.pdf

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Physical Chemistry Catalysis Chemistry Materials Science

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