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/ http://journalarticle.ukm.my/5531/ http://journalarticle.ukm.my/5531/1/11%2520D.D.%2520Suppiah.pdf

id	ukm-5531
recordtype	eprints
spelling	ukm-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
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
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/ http://journalarticle.ukm.my/5531/ http://journalarticle.ukm.my/5531/1/11%2520D.D.%2520Suppiah.pdf
first_indexed	2023-09-18T19:44:24Z
last_indexed	2023-09-18T19:44:24Z
_version_	1777405802892492800

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

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