Synthesis and Physico-Chemical Properties of Nanosized Vanadium Phosphorus Oxide, and its Use as Catalyst in Selective Oxidation of n-Butane to Maleic Anhydride

In this study, nanosized vanadium phosphorus oxide (VPO) catalyst was synthesized via a new organic route. The synthesized nanosized VPO catalyst was compared with conventional VPO catalyst which was prepared via conventional organic route. Besides, various metal dopants i.e zirconium (Zr), zinc (Zn...

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Main Author:	Nawi @ Mohamed, Nurul Suziana
Format:	Thesis
Language:	English English
Published:	2011
Subjects:	Catalysts Maleic anhydride Organic acids
Online Access:	http://psasir.upm.edu.my/id/eprint/19608/1/FS_2011_2.pdf
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spelling	my-upm-ir.196082014-06-13T09:10:19Z Synthesis and Physico-Chemical Properties of Nanosized Vanadium Phosphorus Oxide, and its Use as Catalyst in Selective Oxidation of n-Butane to Maleic Anhydride 2011-01 Nawi @ Mohamed, Nurul Suziana In this study, nanosized vanadium phosphorus oxide (VPO) catalyst was synthesized via a new organic route. The synthesized nanosized VPO catalyst was compared with conventional VPO catalyst which was prepared via conventional organic route. Besides, various metal dopants i.e zirconium (Zr), zinc (Zn), nickel (Ni), molybdenum (Mo), manganese (Mn), niobium (Nb), iron (Fe), copper (Cu), chromium (Cr), cerium (Ce) and cobalt (Co) also used in this study in order to investigate the role of metal dopants on the nanosized VPO catalyst. The physico-chemical properties of the synthesized catalysts were characterized by using x-ray diffraction (XRD), BET surface area measurement, redox titration, inductively coupled plasma –atomic emission spectroscopy (ICP-AES), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) and temperature programmed reduction in H2. The catalytic properties of the synthesized catalysts were carried out by using an on-line microreactor system. Results show that the nanosized VPO catalysts successfully synthesized via new organic route in far less duration i.e. 13 h compared to conventional organic route i.e. 109 h with good properties of the VPO catalysts. XRD pattern of the synthesized VPO catalysts showed the major peak of pyrophosphate, (VO)2P2O7 phase. However, the major peaks for nanosized VPO catalyst especially for (020), (204) and (221) phases are shown to be more prominent than those of conventional VPO catalyst. Besides, the new organic route also produced high surface area VPO catalysts with 5 times larger than conventional VPO catalyst. Formation of thin and increasing of platelets for nanosized VPO catalyst was also observed in SEM micrographs. Furthermore, particle size of this catalyst was found in nanoscale range (40-60 nm) as was proved by TEM. High amount of O2- and O- species removed for nanosized VPO was obtained by H2-TPR directly lead to a significant improvement in n-butane conversion at 673 K and also at lower temperatures (643 and 623 K) with higher maleic anhydride (MA) selectivity for the respective temperatures. The introduction of various metal dopants into the lattices of VPO catalyst did not alter the phase of hemihydrate precursors and the final catalysts. There are small variations can be observed on the surface area, redox titration and average vanadium oxidation state for the nanosized doped VPO catalysts compared to the nanosized undoped VPO catalyst. On the other hand, the incorporation of 1% Nb, Ni, Ce, Zr, Zn, Cr and Fe successfully reduced the particle size below than 40 nm. Moreover, the certain metal dopants can induced the amount of oxygen O2- and O- species removed especially for Ce, Cr and Ni doped catalysts. These fascinating features gave drastic increment for n-butane conversion and maleic anhydride (MA) selectivity at higher and lower temperatures (673, 643 and 623 K). The selectivity of maleic anhydride (MA) of all the synthesized nanosized VPO catalysts at lower temperatures i.e. 643 and 623 K are comparable with the conventional VPO catalyst at higher temperature, 673 K. Catalysts Maleic anhydride Organic acids 2011-01 Thesis http://psasir.upm.edu.my/id/eprint/19608/ http://psasir.upm.edu.my/id/eprint/19608/1/FS_2011_2.pdf application/pdf en public masters Universiti Putra Malaysia Catalysts Maleic anhydride Organic acids Faculty of Science English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Catalysts Maleic anhydride Organic acids
spellingShingle	Catalysts Maleic anhydride Organic acids Nawi @ Mohamed, Nurul Suziana Synthesis and Physico-Chemical Properties of Nanosized Vanadium Phosphorus Oxide, and its Use as Catalyst in Selective Oxidation of n-Butane to Maleic Anhydride
description	In this study, nanosized vanadium phosphorus oxide (VPO) catalyst was synthesized via a new organic route. The synthesized nanosized VPO catalyst was compared with conventional VPO catalyst which was prepared via conventional organic route. Besides, various metal dopants i.e zirconium (Zr), zinc (Zn), nickel (Ni), molybdenum (Mo), manganese (Mn), niobium (Nb), iron (Fe), copper (Cu), chromium (Cr), cerium (Ce) and cobalt (Co) also used in this study in order to investigate the role of metal dopants on the nanosized VPO catalyst. The physico-chemical properties of the synthesized catalysts were characterized by using x-ray diffraction (XRD), BET surface area measurement, redox titration, inductively coupled plasma –atomic emission spectroscopy (ICP-AES), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) and temperature programmed reduction in H2. The catalytic properties of the synthesized catalysts were carried out by using an on-line microreactor system. Results show that the nanosized VPO catalysts successfully synthesized via new organic route in far less duration i.e. 13 h compared to conventional organic route i.e. 109 h with good properties of the VPO catalysts. XRD pattern of the synthesized VPO catalysts showed the major peak of pyrophosphate, (VO)2P2O7 phase. However, the major peaks for nanosized VPO catalyst especially for (020), (204) and (221) phases are shown to be more prominent than those of conventional VPO catalyst. Besides, the new organic route also produced high surface area VPO catalysts with 5 times larger than conventional VPO catalyst. Formation of thin and increasing of platelets for nanosized VPO catalyst was also observed in SEM micrographs. Furthermore, particle size of this catalyst was found in nanoscale range (40-60 nm) as was proved by TEM. High amount of O2- and O- species removed for nanosized VPO was obtained by H2-TPR directly lead to a significant improvement in n-butane conversion at 673 K and also at lower temperatures (643 and 623 K) with higher maleic anhydride (MA) selectivity for the respective temperatures. The introduction of various metal dopants into the lattices of VPO catalyst did not alter the phase of hemihydrate precursors and the final catalysts. There are small variations can be observed on the surface area, redox titration and average vanadium oxidation state for the nanosized doped VPO catalysts compared to the nanosized undoped VPO catalyst. On the other hand, the incorporation of 1% Nb, Ni, Ce, Zr, Zn, Cr and Fe successfully reduced the particle size below than 40 nm. Moreover, the certain metal dopants can induced the amount of oxygen O2- and O- species removed especially for Ce, Cr and Ni doped catalysts. These fascinating features gave drastic increment for n-butane conversion and maleic anhydride (MA) selectivity at higher and lower temperatures (673, 643 and 623 K). The selectivity of maleic anhydride (MA) of all the synthesized nanosized VPO catalysts at lower temperatures i.e. 643 and 623 K are comparable with the conventional VPO catalyst at higher temperature, 673 K.
format	Thesis
qualification_level	Master's degree
author	Nawi @ Mohamed, Nurul Suziana
author_facet	Nawi @ Mohamed, Nurul Suziana
author_sort	Nawi @ Mohamed, Nurul Suziana
title	Synthesis and Physico-Chemical Properties of Nanosized Vanadium Phosphorus Oxide, and its Use as Catalyst in Selective Oxidation of n-Butane to Maleic Anhydride
title_short	Synthesis and Physico-Chemical Properties of Nanosized Vanadium Phosphorus Oxide, and its Use as Catalyst in Selective Oxidation of n-Butane to Maleic Anhydride
title_full	Synthesis and Physico-Chemical Properties of Nanosized Vanadium Phosphorus Oxide, and its Use as Catalyst in Selective Oxidation of n-Butane to Maleic Anhydride
title_fullStr	Synthesis and Physico-Chemical Properties of Nanosized Vanadium Phosphorus Oxide, and its Use as Catalyst in Selective Oxidation of n-Butane to Maleic Anhydride
title_full_unstemmed	Synthesis and Physico-Chemical Properties of Nanosized Vanadium Phosphorus Oxide, and its Use as Catalyst in Selective Oxidation of n-Butane to Maleic Anhydride
title_sort	synthesis and physico-chemical properties of nanosized vanadium phosphorus oxide, and its use as catalyst in selective oxidation of n-butane to maleic anhydride
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science
publishDate	2011
url	http://psasir.upm.edu.my/id/eprint/19608/1/FS_2011_2.pdf
_version_	1747811423368511488

Synthesis and Physico-Chemical Properties of Nanosized Vanadium Phosphorus Oxide, and its Use as Catalyst in Selective Oxidation of n-Butane to Maleic Anhydride

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