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Effects of titration parameters on the synthesis of molybdenum oxides based catalyst

Molybdenum oxides catalysts are extensively used in various selective oxidation reactions. In this work, controlled precipitation method was used to synthesise molybdenum oxides. The effects of various titration parameters on the precipitate growth rate and structure throughout catalyst synthesis we...

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Main Authors: Suppiah, D.D, Hamid, F.A, Kutty, M.G, Abd. Hamid, S.B
Format: Article
Language:English
Published: Universiti Kebangsaan Malaysia 2012
Online Access:http://journalarticle.ukm.my/5531/1/11%2520D.D.%2520Suppiah.pdf
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spelling my-ukm.journal.55312016-12-14T06:38:44Z http://journalarticle.ukm.my/5531/ Effects of titration parameters on the synthesis of molybdenum oxides based catalyst Suppiah, D.D Hamid, F.A Kutty, M.G Abd. Hamid, S.B Molybdenum oxides catalysts are extensively used in various selective oxidation reactions. In this work, controlled precipitation method was used to synthesise molybdenum oxides. The effects of various titration parameters on the precipitate growth rate and structure throughout catalyst synthesis were investigated. The titration parameters varied for this study were molybdates (ammonium heptamolybdate) concentration, precipitation agent (HNO3) concentration, precipitating agent rate of addition and temperature of synthesis. X-Ray diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM) were used to characterize the catalysts. This study highlights the significant effects of the titration parameters varied on the supersaturation of the solution therefore yielding precipitate with different morphology. It was observed that the temperature played the major role followed by molybdate concentration in the formation of the bulk catalyst. Supramolecular structure (Mo36O112) was observed at lower temperature (30ºC) and lower molybdate concentration (0.07 M, 0.10 M) while at higher temperature (50ºC) and higher molybdate concentration(0.14 M) hexagonal (h-MoO3) phase structure was formed. Fast rate of addition and high concentration of precipitating agent affected the solution equilibrium leading to unclear inflection point (supersaturation point) at the titration curve. Universiti Kebangsaan Malaysia 2012-10 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/5531/1/11%2520D.D.%2520Suppiah.pdf Suppiah, D.D and Hamid, F.A and Kutty, M.G and Abd. Hamid, S.B (2012) Effects of titration parameters on the synthesis of molybdenum oxides based catalyst. Sains Malaysiana, 41 (10). pp. 1245-1251. ISSN 0126-6039 http://www.ukm.my/jsm/contents.html
institution Universiti Kebangsaan Malaysia
building Perpustakaan Tun Sri Lanang Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Kebangsaan Malaysia
content_source UKM Journal Article Repository
url_provider http://journalarticle.ukm.my/
language English
description Molybdenum oxides catalysts are extensively used in various selective oxidation reactions. In this work, controlled precipitation method was used to synthesise molybdenum oxides. The effects of various titration parameters on the precipitate growth rate and structure throughout catalyst synthesis were investigated. The titration parameters varied for this study were molybdates (ammonium heptamolybdate) concentration, precipitation agent (HNO3) concentration, precipitating agent rate of addition and temperature of synthesis. X-Ray diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM) were used to characterize the catalysts. This study highlights the significant effects of the titration parameters varied on the supersaturation of the solution therefore yielding precipitate with different morphology. It was observed that the temperature played the major role followed by molybdate concentration in the formation of the bulk catalyst. Supramolecular structure (Mo36O112) was observed at lower temperature (30ºC) and lower molybdate concentration (0.07 M, 0.10 M) while at higher temperature (50ºC) and higher molybdate concentration(0.14 M) hexagonal (h-MoO3) phase structure was formed. Fast rate of addition and high concentration of precipitating agent affected the solution equilibrium leading to unclear inflection point (supersaturation point) at the titration curve.
format Article
author Suppiah, D.D
Hamid, F.A
Kutty, M.G
Abd. Hamid, S.B
spellingShingle Suppiah, D.D
Hamid, F.A
Kutty, M.G
Abd. Hamid, S.B
Effects of titration parameters on the synthesis of molybdenum oxides based catalyst
author_facet Suppiah, D.D
Hamid, F.A
Kutty, M.G
Abd. Hamid, S.B
author_sort Suppiah, D.D
title Effects of titration parameters on the synthesis of molybdenum oxides based catalyst
title_short Effects of titration parameters on the synthesis of molybdenum oxides based catalyst
title_full Effects of titration parameters on the synthesis of molybdenum oxides based catalyst
title_fullStr Effects of titration parameters on the synthesis of molybdenum oxides based catalyst
title_full_unstemmed Effects of titration parameters on the synthesis of molybdenum oxides based catalyst
title_sort effects of titration parameters on the synthesis of molybdenum oxides based catalyst
publisher Universiti Kebangsaan Malaysia
publishDate 2012
url http://journalarticle.ukm.my/5531/1/11%2520D.D.%2520Suppiah.pdf
http://journalarticle.ukm.my/5531/
http://www.ukm.my/jsm/contents.html
_version_ 1643736445231300608
score 13.211869

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