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Influence of intercalation-exfoliation-reduction technique towards the physico-chemical of VPO catalysts


Wong, Yee Ching and Yap, Taufiq Yun Hin (2013) Influence of intercalation-exfoliation-reduction technique towards the physico-chemical of VPO catalysts. Journal of Chemistry, 2013. art. no. 727539. pp. 1-8. ISSN 2090-9063; ESSN: 2090-9071


Four VPO catalysts were synthesized through intercalation and exfoliation in various alcohols and subsequent reduction of the exfoliated VOPO4 sheets with various alcohols to produce VOHPO40.5H2O. The resulting VOHPO40.5H2O that undergoes the intercalation-exfoliation-reduction (IER) process will be further activated into VPO catalysts, and addition of 1 mole Bi(NO3)35H2O in the first stage of this experiment has also being investigated. The synthesized materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and temperature-programmed reduction (TPR) in H2. Catalytic evaluation of the IER-treated and Bi-doped VPO catalysts was also studied on microreactor. The VPO catalyst produced through IER using 2-butanol and ethanol with addition of Bi, IERC(2Bu-Et)RBi1, gave the highest MA selectivity due to reactive O 2- species released from the additional crystalline V 5+ phase formed by doping 1 bismuth as promoter (O 2-V 5+ pair) at relative lower temperature. Nevertheless, the VPO catalyst produced through IER using isobutanol, IERC(isoBu), gave the highest activity due to high amount of reactive O - species released from V 4+ phase (O - V 4+ pair) whereby the IERC(isoBu) catalyst synthesized consists of high percentage of V 4+ (93).

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1155/2013/727539
Publisher: Hindawi Publishing Corporation
Keywords: VPO catalysts; Vanadyl pyrophosphate; Intercalation; Exfoliation
Depositing User: Umikalthom Abdullah
Date Deposited: 30 Jun 2014 02:05
Last Modified: 24 Nov 2016 08:16
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1155/2013/727539
URI: http://psasir.upm.edu.my/id/eprint/30092
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