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Influence of rare-earth and bimetallic promoters on various VPO catalysts for partial oxidation of n-butane

Vanadium phosphorous oxide (VPO) catalyst was prepared using dihydrate method and tested for the potential use in selective oxidation of n-butane to maleic anhydride. The catalysts were doped by La, Ce and combined components Ce + Co and Ce + Bi through impregnation. The effect of promoters on catal...

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Main Authors: Rownaghi, Ali Asghar, Yap, Taufiq Yun Hin, Rezaei, Fateme
Format: Article
Language:English
Published: Springer 2009
Online Access:http://psasir.upm.edu.my/id/eprint/15213/1/Influence%20of%20rare.pdf
http://psasir.upm.edu.my/id/eprint/15213/
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spelling my.upm.eprints.152132016-11-29T08:13:02Z http://psasir.upm.edu.my/id/eprint/15213/ Influence of rare-earth and bimetallic promoters on various VPO catalysts for partial oxidation of n-butane Rownaghi, Ali Asghar Yap, Taufiq Yun Hin Rezaei, Fateme Vanadium phosphorous oxide (VPO) catalyst was prepared using dihydrate method and tested for the potential use in selective oxidation of n-butane to maleic anhydride. The catalysts were doped by La, Ce and combined components Ce + Co and Ce + Bi through impregnation. The effect of promoters on catalyst morphology and the development of acid and redox sites were studied through XRD, BET, SEM, H2-TPR and TPRn reaction of n-butane/He. Addition of rare-earth element to VPO formulation and drying of catalyst precursor by microwave irradiation increased the fall width at half maximum (FWHM) and reduced the crystallite size of the Vanadyl hydrogen phosphate hemihydrate (VOHPO4 · 1/2 H2O, VHP) precursor phase and thus led to the production of final catalysts with larger surface area. The Ce doped VPO catalyst which, assisted by the microwave heating method, exhibited the highest surface area. Moreover, the addition of promoters significantly increased catalyst activity and selectivity as compared to undoped VPO catalyst in the oxidation reaction of n-butane. The H2-TPR and TPRn reaction profiles showed that the highest amount of active oxygen species, i.e., the V4+–O− pair, was removed from the bimetallic (Ce + Bi) promoted catalyst. This pair is responsible for n-butane activation. Furthermore, based on catalytic test results, it was demonstrated that the catalyst promoted with Ce and Bi (VPOD1) was the most active and selective catalyst among the produced catalysts with 52% reaction yield. This suggests that the rare earth metal promoted vanadium phosphate catalyst is a promising method to improve the catalytic properties of VPO for the partial oxidation of n-butane to maleic anhydride. Springer 2009 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/15213/1/Influence%20of%20rare.pdf Rownaghi, Ali Asghar and Yap, Taufiq Yun Hin and Rezaei, Fateme (2009) Influence of rare-earth and bimetallic promoters on various VPO catalysts for partial oxidation of n-butane. Catalysis Letters, 130 (3-4). pp. 504-516. ISSN 1011-372X; ESSN: 1572-879X 10.1007/s10562-009-0027-7
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Vanadium phosphorous oxide (VPO) catalyst was prepared using dihydrate method and tested for the potential use in selective oxidation of n-butane to maleic anhydride. The catalysts were doped by La, Ce and combined components Ce + Co and Ce + Bi through impregnation. The effect of promoters on catalyst morphology and the development of acid and redox sites were studied through XRD, BET, SEM, H2-TPR and TPRn reaction of n-butane/He. Addition of rare-earth element to VPO formulation and drying of catalyst precursor by microwave irradiation increased the fall width at half maximum (FWHM) and reduced the crystallite size of the Vanadyl hydrogen phosphate hemihydrate (VOHPO4 · 1/2 H2O, VHP) precursor phase and thus led to the production of final catalysts with larger surface area. The Ce doped VPO catalyst which, assisted by the microwave heating method, exhibited the highest surface area. Moreover, the addition of promoters significantly increased catalyst activity and selectivity as compared to undoped VPO catalyst in the oxidation reaction of n-butane. The H2-TPR and TPRn reaction profiles showed that the highest amount of active oxygen species, i.e., the V4+–O− pair, was removed from the bimetallic (Ce + Bi) promoted catalyst. This pair is responsible for n-butane activation. Furthermore, based on catalytic test results, it was demonstrated that the catalyst promoted with Ce and Bi (VPOD1) was the most active and selective catalyst among the produced catalysts with 52% reaction yield. This suggests that the rare earth metal promoted vanadium phosphate catalyst is a promising method to improve the catalytic properties of VPO for the partial oxidation of n-butane to maleic anhydride.
format Article
author Rownaghi, Ali Asghar
Yap, Taufiq Yun Hin
Rezaei, Fateme
spellingShingle Rownaghi, Ali Asghar
Yap, Taufiq Yun Hin
Rezaei, Fateme
Influence of rare-earth and bimetallic promoters on various VPO catalysts for partial oxidation of n-butane
author_facet Rownaghi, Ali Asghar
Yap, Taufiq Yun Hin
Rezaei, Fateme
author_sort Rownaghi, Ali Asghar
title Influence of rare-earth and bimetallic promoters on various VPO catalysts for partial oxidation of n-butane
title_short Influence of rare-earth and bimetallic promoters on various VPO catalysts for partial oxidation of n-butane
title_full Influence of rare-earth and bimetallic promoters on various VPO catalysts for partial oxidation of n-butane
title_fullStr Influence of rare-earth and bimetallic promoters on various VPO catalysts for partial oxidation of n-butane
title_full_unstemmed Influence of rare-earth and bimetallic promoters on various VPO catalysts for partial oxidation of n-butane
title_sort influence of rare-earth and bimetallic promoters on various vpo catalysts for partial oxidation of n-butane
publisher Springer
publishDate 2009
url http://psasir.upm.edu.my/id/eprint/15213/1/Influence%20of%20rare.pdf
http://psasir.upm.edu.my/id/eprint/15213/
_version_ 1643825867073257472
score 13.211869

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