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Influence of the ethylene glycol, water treatment and microwave irradiation on the characteristics and performance of VPO catalysts for n-butane oxidation to maleic anhydride


Citation

Rownaghi, Ali Asghar and Yap, Taufiq Yun Hin and Tang, Wen Jiunn (2009) Influence of the ethylene glycol, water treatment and microwave irradiation on the characteristics and performance of VPO catalysts for n-butane oxidation to maleic anhydride. Catalysis Letters, 130 (3-4). pp. 593-603. ISSN 1011-372X; ESSN: 1572-879X

Abstract

In this paper, the preparation of vanadium phosphate catalysts was shown to be improved by (1) using V2O5 and ethylene glycol as starting and reducing agent material, respectively for VOPO4 · 2H2O, (2) subsequent water treatment and (3) microwave irradiation. In particular, the preparation route, based on the reduction of VOPO4 · 2H2O with various alcohols, is described in detail and contrasted with other three established methods performed by using ethylene glycol and isobutyl alcohol as reductant and solvent for V2O5 or distilled water as a solvent material. The preparation of catalyst precursor is carried out by two different methods, namely conventional heating and microwave irradiation. With this new technique, catalysts derived from the reduction of VOPO4 · 2H2O by ethylene glycol exhibit substantially higher surface area (typically >40 m2 g−1) and activity. In fact, the surface area of the catalyst is significantly enhanced when the precursor is refluxed by distilled water and dried by microwave heating. The characterization of catalysts was carried out using X-ray diffraction (XRD), Brunauer–Emmer–Teller (BET) surface area measurement, temperature programmed reduction (H2-TPR), temperature-programmed reaction (TPRn) and scanning electron microscopy (SEM). This study shows that employing ethylene glycol as reducing agent, followed by adding the water treatment step to catalyst synthesis procedure, and using microwave irradiation would give rise to enhanced surface area, activity and selectivity of the catalyst. Moreover, it introduces a more energy efficient procedure for preparation of vanadium phosphate catalyst used in selective oxidation of n-butane process.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1007/s10562-009-9951-9
Publisher: Springer
Keywords: Vanadium phosphate catalyst; Ethylene glycol; Water treatment; Microwave irradiation; TPRn; n-butane oxidation
Depositing User: Nabilah Mustapa
Date Deposited: 09 May 2019 01:27
Last Modified: 09 May 2019 01:27
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1007/s10562-009-9951-9
URI: http://psasir.upm.edu.my/id/eprint/15218
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