The Effects of Dopants on The Physico-Chemical Properties of Vanadyl Pyrophosphate Catalysts

Vanadium phosphorus oxide (VPO) is a commercial catalyst for selective oxidation of butane to maleic anhydride. The nature of the oxidant of the doped and undoped (VOhP207 catalysts derived from (i) VPO, reaction of V20s with H3P04 in isobutanol and (ii) VPD, reaction of VOP04·2H20 with isobutano...

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Main Author:	Tan, Kian Peng
Format:	Thesis
Language:	English English
Published:	2003
Subjects:	Vanadium catalysts. Oxidation.
Online Access:	http://psasir.upm.edu.my/id/eprint/9598/1/FSAS_2003_49_IR.pdf
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id	my-upm-ir.9598
record_format	uketd_dc
spelling	my-upm-ir.95982023-11-28T01:48:21Z The Effects of Dopants on The Physico-Chemical Properties of Vanadyl Pyrophosphate Catalysts 2003-11 Tan, Kian Peng Vanadium phosphorus oxide (VPO) is a commercial catalyst for selective oxidation of butane to maleic anhydride. The nature of the oxidant of the doped and undoped (VOhP207 catalysts derived from (i) VPO, reaction of V20s with H3P04 in isobutanol and (ii) VPD, reaction of VOP04·2H20 with isobutanol were investigated. Metal cations, namely of sodium, potassium, magnesium and bismuth, were added as dopants into (VO)2P2O7 lattice. From the Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) analysis, the catalysts which have gone through a series of redox reaction do not produce the original morphology of (VO)2P207. The results indicated that the addition of dopants lowered the Brunauer-Emmet-Teller (BET) surface area of vanadyl pyrophosphate catalysts, except Bi-doped VPD catalysts. All the doped VPO and VPD catalysts have been shown a vanadyl pyrophosphate phase with three distinct peaks at 22.9°, 28.4° and 29.3° in X-ray Diffraction (XRD) analysis. The Bi-doped VPO and VPD catalysts had significantly shifted the first reduction peak to a lower temperature in H2-TPR analysis. The introduction of Bi have modified the (VOhP207 matrix and mobility of these catalyst increased. It can be seen from TPRn analysis where VPDBil increased the selectivity of butene and butadiene (selective products) and decreased the selectivity of CO and C02 (unselective products). Vanadium catalysts. Oxidation. 2003-11 Thesis http://psasir.upm.edu.my/id/eprint/9598/ http://psasir.upm.edu.my/id/eprint/9598/1/FSAS_2003_49_IR.pdf text en public Universiti Putra Malaysia Vanadium catalysts. Oxidation. Faculty of Science and Environmental Studies Yun Hin, Taufiq Yap English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
advisor	Yun Hin, Taufiq Yap
topic	Vanadium catalysts. Oxidation.
spellingShingle	Vanadium catalysts. Oxidation. Tan, Kian Peng The Effects of Dopants on The Physico-Chemical Properties of Vanadyl Pyrophosphate Catalysts
description	Vanadium phosphorus oxide (VPO) is a commercial catalyst for selective oxidation of butane to maleic anhydride. The nature of the oxidant of the doped and undoped (VOhP207 catalysts derived from (i) VPO, reaction of V20s with H3P04 in isobutanol and (ii) VPD, reaction of VOP04·2H20 with isobutanol were investigated. Metal cations, namely of sodium, potassium, magnesium and bismuth, were added as dopants into (VO)2P2O7 lattice. From the Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) analysis, the catalysts which have gone through a series of redox reaction do not produce the original morphology of (VO)2P207. The results indicated that the addition of dopants lowered the Brunauer-Emmet-Teller (BET) surface area of vanadyl pyrophosphate catalysts, except Bi-doped VPD catalysts. All the doped VPO and VPD catalysts have been shown a vanadyl pyrophosphate phase with three distinct peaks at 22.9°, 28.4° and 29.3° in X-ray Diffraction (XRD) analysis. The Bi-doped VPO and VPD catalysts had significantly shifted the first reduction peak to a lower temperature in H2-TPR analysis. The introduction of Bi have modified the (VOhP207 matrix and mobility of these catalyst increased. It can be seen from TPRn analysis where VPDBil increased the selectivity of butene and butadiene (selective products) and decreased the selectivity of CO and C02 (unselective products).
format	Thesis
author	Tan, Kian Peng
author_facet	Tan, Kian Peng
author_sort	Tan, Kian Peng
title	The Effects of Dopants on The Physico-Chemical Properties of Vanadyl Pyrophosphate Catalysts
title_short	The Effects of Dopants on The Physico-Chemical Properties of Vanadyl Pyrophosphate Catalysts
title_full	The Effects of Dopants on The Physico-Chemical Properties of Vanadyl Pyrophosphate Catalysts
title_fullStr	The Effects of Dopants on The Physico-Chemical Properties of Vanadyl Pyrophosphate Catalysts
title_full_unstemmed	The Effects of Dopants on The Physico-Chemical Properties of Vanadyl Pyrophosphate Catalysts
title_sort	effects of dopants on the physico-chemical properties of vanadyl pyrophosphate catalysts
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science and Environmental Studies
publishDate	2003
url	http://psasir.upm.edu.my/id/eprint/9598/1/FSAS_2003_49_IR.pdf
_version_	1794018853064278016

The Effects of Dopants on The Physico-Chemical Properties of Vanadyl Pyrophosphate Catalysts

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