Hydrothermal Synthesis of Vanadium Phosphorus Oxide Catalysts for Selective Oxidation of N-Butane to Maleic Anhydride

Vanadium phosphorus oxide (VPO) catalyst is commercially used in industry for the selective oxidation of n-butane to maleic anhydride. A number of new methods have been suggested by researchers worldwide in the preparation of precursor compound, VOHPO4·0.5H2O which is subsequently transformed und...

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Main Author:	Ab Rahim, Mohd Hasbi
Format:	Thesis
Language:	English English
Published:	2006
Subjects:	Vanadium oxide - Synthesis Butane - Oxidation
Online Access:	http://psasir.upm.edu.my/id/eprint/267/3/549078_fs_2006_5_abstrak_je__dh_pdf_.pdf
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spelling	my-upm-ir.2672013-05-27T06:47:07Z Hydrothermal Synthesis of Vanadium Phosphorus Oxide Catalysts for Selective Oxidation of N-Butane to Maleic Anhydride 2006-01 Ab Rahim, Mohd Hasbi Vanadium phosphorus oxide (VPO) catalyst is commercially used in industry for the selective oxidation of n-butane to maleic anhydride. A number of new methods have been suggested by researchers worldwide in the preparation of precursor compound, VOHPO4·0.5H2O which is subsequently transformed under suitable reaction condition to give the better catalysts in terms of selectivity to maleic anhydride and the n-butane activity. In this study, VPO catalysts were synthesized using a new hydrothermal method. Roughly, this study can be divided into three sections based on three groups of VPO catalysts prepared. The first catalyst was prepared following the procedure in the literature. The second group of VPO catalyst were prepared by the modification of this procedure which focused on different reaction time in autoclave. Lastly, the effect of mechanochemical treatment on the hydrothermal prepared sample was studied. The results show that VPO catalysts were successfully prepared by hydrothermal method. The morphology, structure, oxidant’s nature and catalytic performance for butane oxidation to maleic anhydride over these catalysts strongly depended on the preparation procedure of the VOHPO4 0.5H2O precursor and also the transformation into the VPO catalyst. Increasing the length of reaction time in autoclave at 423 K does not affect the surface area and bulk morphology of the catalyst. However, amounts of O2 removed and desorbed from the lattice are directly proportional with reaction time in autoclave. Interestingly, there are trends of results were observed for the milled material. This mechanochemical treatment contributed to a higher surface area with high mobility and reactivity of the lattice oxygen. The pretreatment also induced the amount of V5+ phase of the catalyst. An appropriate amount of V5+ phase present in VPO catalyst is significantly increased the activity of these catalysts Vanadium oxide - Synthesis Butane - Oxidation 2006-01 Thesis http://psasir.upm.edu.my/id/eprint/267/ http://psasir.upm.edu.my/id/eprint/267/3/549078_fs_2006_5_abstrak_je__dh_pdf_.pdf application/pdf en public masters Universiti Putra Malaysia Vanadium oxide - Synthesis Butane - Oxidation Faculty of Science English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Vanadium oxide - Synthesis Butane - Oxidation
spellingShingle	Vanadium oxide - Synthesis Butane - Oxidation Ab Rahim, Mohd Hasbi Hydrothermal Synthesis of Vanadium Phosphorus Oxide Catalysts for Selective Oxidation of N-Butane to Maleic Anhydride
description	Vanadium phosphorus oxide (VPO) catalyst is commercially used in industry for the selective oxidation of n-butane to maleic anhydride. A number of new methods have been suggested by researchers worldwide in the preparation of precursor compound, VOHPO4·0.5H2O which is subsequently transformed under suitable reaction condition to give the better catalysts in terms of selectivity to maleic anhydride and the n-butane activity. In this study, VPO catalysts were synthesized using a new hydrothermal method. Roughly, this study can be divided into three sections based on three groups of VPO catalysts prepared. The first catalyst was prepared following the procedure in the literature. The second group of VPO catalyst were prepared by the modification of this procedure which focused on different reaction time in autoclave. Lastly, the effect of mechanochemical treatment on the hydrothermal prepared sample was studied. The results show that VPO catalysts were successfully prepared by hydrothermal method. The morphology, structure, oxidant’s nature and catalytic performance for butane oxidation to maleic anhydride over these catalysts strongly depended on the preparation procedure of the VOHPO4 0.5H2O precursor and also the transformation into the VPO catalyst. Increasing the length of reaction time in autoclave at 423 K does not affect the surface area and bulk morphology of the catalyst. However, amounts of O2 removed and desorbed from the lattice are directly proportional with reaction time in autoclave. Interestingly, there are trends of results were observed for the milled material. This mechanochemical treatment contributed to a higher surface area with high mobility and reactivity of the lattice oxygen. The pretreatment also induced the amount of V5+ phase of the catalyst. An appropriate amount of V5+ phase present in VPO catalyst is significantly increased the activity of these catalysts
format	Thesis
qualification_level	Master's degree
author	Ab Rahim, Mohd Hasbi
author_facet	Ab Rahim, Mohd Hasbi
author_sort	Ab Rahim, Mohd Hasbi
title	Hydrothermal Synthesis of Vanadium Phosphorus Oxide Catalysts for Selective Oxidation of N-Butane to Maleic Anhydride
title_short	Hydrothermal Synthesis of Vanadium Phosphorus Oxide Catalysts for Selective Oxidation of N-Butane to Maleic Anhydride
title_full	Hydrothermal Synthesis of Vanadium Phosphorus Oxide Catalysts for Selective Oxidation of N-Butane to Maleic Anhydride
title_fullStr	Hydrothermal Synthesis of Vanadium Phosphorus Oxide Catalysts for Selective Oxidation of N-Butane to Maleic Anhydride
title_full_unstemmed	Hydrothermal Synthesis of Vanadium Phosphorus Oxide Catalysts for Selective Oxidation of N-Butane to Maleic Anhydride
title_sort	hydrothermal synthesis of vanadium phosphorus oxide catalysts for selective oxidation of n-butane to maleic anhydride
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science
publishDate	2006
url	http://psasir.upm.edu.my/id/eprint/267/3/549078_fs_2006_5_abstrak_je__dh_pdf_.pdf
_version_	1747810187924733952

Hydrothermal Synthesis of Vanadium Phosphorus Oxide Catalysts for Selective Oxidation of N-Butane to Maleic Anhydride

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