Synthesis and Characterisation of Vanadium Antimony Oxide Catalysts

V -Sb-oxide catalysts are commercially viable catalysts for the ammoxidation of propane to acrylonitrile, a novel and considerable cost saving route compared to the current industrial method which utilizes the ammoxidation of propene. The characteristic of VSb- oxide catalysts were studied and an...

Full description

Saved in:

Bibliographic Details
Main Author:	Jong, Ita Yee Ping
Format:	Thesis
Language:	English English
Published:	2002
Subjects:	Vanadium catalysts - Synthesis
Online Access:	http://psasir.upm.edu.my/id/eprint/9369/1/FSAS_2002_13.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-upm-ir.9369
record_format	uketd_dc
spelling	my-upm-ir.93692024-02-21T02:09:16Z Synthesis and Characterisation of Vanadium Antimony Oxide Catalysts 2002-03 Jong, Ita Yee Ping V -Sb-oxide catalysts are commercially viable catalysts for the ammoxidation of propane to acrylonitrile, a novel and considerable cost saving route compared to the current industrial method which utilizes the ammoxidation of propene. The characteristic of VSb- oxide catalysts were studied and analyzed in relation to their structural/composition features using X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Brunauer- Emmett-Teller (BET) surface area, Scanning Electron Micrograph (SEM), Energy Dispersive X-ray (EDX) microanalysis and Thermogravimetric Analysis (TGA). Results showed significant difference in presence of crystalline phases, surface area, porosity and morphologies in the samples prepared according to three different methods, i.e. solid state (88) reaction, sol-gel (G8) and deposition on antimonic acid (DAA) methods, as a function of the Sb:V ratio and heat treatment. XRD and FTIR studies revealed that the calcination temperature at 500°C is not suitable for the V -Sb-oxide catalysts as there is little or no VSb04 formed in some samples. Sb/V ratio of2 or more is recommended for the GS method as there is hardly any Sb species formed for samples with 5bN ratio = 1. For the 55 method, sample calcined at 700°C with SbN ratio = 1 would be deemed the best as it has the highest amount of VSb04• Raising of calcination temperature had a detrimental effect on the surface area of the GS and DAA catalysts but bore no significant effect on SS catalysts. The EDX microanalysis showed antimony enrichment on the surface the catalysts. The study of TPD revealed the evolution of lattice oxygen from the catalysts. In TPR, the amount of oxygen desorbed from the catalysts prepared by SS method is found to be much higher compared to the other methods, i.e. about 16.7 times higher than GS method and 6.3 times higher than DAA method (for SbN = 1) whilst for ratio 3, it is 21.3 times higher than GS method and 14.5 times higher than DAA method. Vanadium catalysts - Synthesis 2002-03 Thesis http://psasir.upm.edu.my/id/eprint/9369/ http://psasir.upm.edu.my/id/eprint/9369/1/FSAS_2002_13.pdf text en public masters Universiti Putra Malaysia Vanadium catalysts - Synthesis Faculty of Science and Environmental Studies Yap, Taufiq Yun Hin English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
advisor	Yap, Taufiq Yun Hin
topic	Vanadium catalysts - Synthesis
spellingShingle	Vanadium catalysts - Synthesis Jong, Ita Yee Ping Synthesis and Characterisation of Vanadium Antimony Oxide Catalysts
description	V -Sb-oxide catalysts are commercially viable catalysts for the ammoxidation of propane to acrylonitrile, a novel and considerable cost saving route compared to the current industrial method which utilizes the ammoxidation of propene. The characteristic of VSb- oxide catalysts were studied and analyzed in relation to their structural/composition features using X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Brunauer- Emmett-Teller (BET) surface area, Scanning Electron Micrograph (SEM), Energy Dispersive X-ray (EDX) microanalysis and Thermogravimetric Analysis (TGA). Results showed significant difference in presence of crystalline phases, surface area, porosity and morphologies in the samples prepared according to three different methods, i.e. solid state (88) reaction, sol-gel (G8) and deposition on antimonic acid (DAA) methods, as a function of the Sb:V ratio and heat treatment. XRD and FTIR studies revealed that the calcination temperature at 500°C is not suitable for the V -Sb-oxide catalysts as there is little or no VSb04 formed in some samples. Sb/V ratio of2 or more is recommended for the GS method as there is hardly any Sb species formed for samples with 5bN ratio = 1. For the 55 method, sample calcined at 700°C with SbN ratio = 1 would be deemed the best as it has the highest amount of VSb04• Raising of calcination temperature had a detrimental effect on the surface area of the GS and DAA catalysts but bore no significant effect on SS catalysts. The EDX microanalysis showed antimony enrichment on the surface the catalysts. The study of TPD revealed the evolution of lattice oxygen from the catalysts. In TPR, the amount of oxygen desorbed from the catalysts prepared by SS method is found to be much higher compared to the other methods, i.e. about 16.7 times higher than GS method and 6.3 times higher than DAA method (for SbN = 1) whilst for ratio 3, it is 21.3 times higher than GS method and 14.5 times higher than DAA method.
format	Thesis
qualification_level	Master's degree
author	Jong, Ita Yee Ping
author_facet	Jong, Ita Yee Ping
author_sort	Jong, Ita Yee Ping
title	Synthesis and Characterisation of Vanadium Antimony Oxide Catalysts
title_short	Synthesis and Characterisation of Vanadium Antimony Oxide Catalysts
title_full	Synthesis and Characterisation of Vanadium Antimony Oxide Catalysts
title_fullStr	Synthesis and Characterisation of Vanadium Antimony Oxide Catalysts
title_full_unstemmed	Synthesis and Characterisation of Vanadium Antimony Oxide Catalysts
title_sort	synthesis and characterisation of vanadium antimony oxide catalysts
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Science and Environmental Studies
publishDate	2002
url	http://psasir.upm.edu.my/id/eprint/9369/1/FSAS_2002_13.pdf
_version_	1794018829824688128

Synthesis and Characterisation of Vanadium Antimony Oxide Catalysts

Similar Items