PHYSICAL AND CHEMICAL PROPERTIES ON REDUCTION BEHAVIOUR OF CHROMIUM DOPED TO MOLYBDENUM OXIDE IN CARBON MONOXIDE ENVIRONMENT; [Sifat Fizikal dan Kimia terhadap Tindak Balas Penurunan Kromium yang Didopkan kepada Molibdenum Oksida di dalam Persekitaran Karbon Monoksida]

PHYSICAL AND CHEMICAL PROPERTIES ON REDUCTION BEHAVIOUR OF CHROMIUM DOPED TO MOLYBDENUM OXIDE IN CARBON MONOXIDE ENVIRONMENT; [Sifat Fizikal dan Kimia terhadap Tindak Balas Penurunan Kromium yang Didopkan kepada Molibdenum Oksida di dalam Persekitaran Karbon Monoksida]

This study aimed to investigate the influence of added chromium on the physical and chemical reduction behavior of molybdenum trioxide (MoO3) in a carbon monoxide (CO) environment. The reduction behavior of the sample was evaluated by using temperature-programmed reduction (TPR), and the phases prod...

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Published in:Malaysian Journal of Analytical Sciences
Main Author: Rahim N.S.A.; Samsuri A.; Latif M.N.; Tahari M.N.A.; Salleh F.; Saharuddin T.S.T.; Dzakaria N.; Yusop M.R.
Format: Article
Language:English
Published: Malaysian Society of Analytical Sciences 2023
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85159136440&partnerID=40&md5=6f876331ad16e8074c133a9d72591ffe
id 2-s2.0-85159136440
spelling 2-s2.0-85159136440
Rahim N.S.A.; Samsuri A.; Latif M.N.; Tahari M.N.A.; Salleh F.; Saharuddin T.S.T.; Dzakaria N.; Yusop M.R.
PHYSICAL AND CHEMICAL PROPERTIES ON REDUCTION BEHAVIOUR OF CHROMIUM DOPED TO MOLYBDENUM OXIDE IN CARBON MONOXIDE ENVIRONMENT; [Sifat Fizikal dan Kimia terhadap Tindak Balas Penurunan Kromium yang Didopkan kepada Molibdenum Oksida di dalam Persekitaran Karbon Monoksida]
2023
Malaysian Journal of Analytical Sciences
27
2

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85159136440&partnerID=40&md5=6f876331ad16e8074c133a9d72591ffe
This study aimed to investigate the influence of added chromium on the physical and chemical reduction behavior of molybdenum trioxide (MoO3) in a carbon monoxide (CO) environment. The reduction behavior of the sample was evaluated by using temperature-programmed reduction (TPR), and the phases produced by the reduced samples were analyzed using X-ray diffraction spectroscopy (XRD) and field emission scanning electron microscopy (FESEM). The TPR study was conducted using two reduction modes: non-isothermal reduction at 700°C with 20 vol. % of CO in nitrogen (N2), followed by isothermal reduction at 700°C for an additional 60 min. The TPR profile showed that the reduction of doped and undoped MoO3 was preceded by two reduction stages (MoO3 → Mo4O11 → MoO2), wherein, the reduction of doped MoO3 starting at a lower temperature (380°C-500°C) than that of undoped MoO3 (550°C). Additionally, based on XRD analysis, it was shown that the conversion of MoO3 to MoO2 under CO generated an intermediate product known as Mo4O11. It is discovered that, increasing the concentration of chromium doped to MoO3 enhanced the reducibility of oxide due to the rapid production of MoO2 phases at T: 380ºC. Further heating under CO atmosphere, carbide species built up in the form of Mo2C rather than metallic Mo which might be due to excess of CO exposure to the surface layer of oxide. © 2023, Malaysian Society of Analytical Sciences. All rights reserved.
Malaysian Society of Analytical Sciences
13942506
English
Article
author Rahim N.S.A.; Samsuri A.; Latif M.N.; Tahari M.N.A.; Salleh F.; Saharuddin T.S.T.; Dzakaria N.; Yusop M.R.
spellingShingle Rahim N.S.A.; Samsuri A.; Latif M.N.; Tahari M.N.A.; Salleh F.; Saharuddin T.S.T.; Dzakaria N.; Yusop M.R.
PHYSICAL AND CHEMICAL PROPERTIES ON REDUCTION BEHAVIOUR OF CHROMIUM DOPED TO MOLYBDENUM OXIDE IN CARBON MONOXIDE ENVIRONMENT; [Sifat Fizikal dan Kimia terhadap Tindak Balas Penurunan Kromium yang Didopkan kepada Molibdenum Oksida di dalam Persekitaran Karbon Monoksida]
author_facet Rahim N.S.A.; Samsuri A.; Latif M.N.; Tahari M.N.A.; Salleh F.; Saharuddin T.S.T.; Dzakaria N.; Yusop M.R.
author_sort Rahim N.S.A.; Samsuri A.; Latif M.N.; Tahari M.N.A.; Salleh F.; Saharuddin T.S.T.; Dzakaria N.; Yusop M.R.
title PHYSICAL AND CHEMICAL PROPERTIES ON REDUCTION BEHAVIOUR OF CHROMIUM DOPED TO MOLYBDENUM OXIDE IN CARBON MONOXIDE ENVIRONMENT; [Sifat Fizikal dan Kimia terhadap Tindak Balas Penurunan Kromium yang Didopkan kepada Molibdenum Oksida di dalam Persekitaran Karbon Monoksida]
title_short PHYSICAL AND CHEMICAL PROPERTIES ON REDUCTION BEHAVIOUR OF CHROMIUM DOPED TO MOLYBDENUM OXIDE IN CARBON MONOXIDE ENVIRONMENT; [Sifat Fizikal dan Kimia terhadap Tindak Balas Penurunan Kromium yang Didopkan kepada Molibdenum Oksida di dalam Persekitaran Karbon Monoksida]
title_full PHYSICAL AND CHEMICAL PROPERTIES ON REDUCTION BEHAVIOUR OF CHROMIUM DOPED TO MOLYBDENUM OXIDE IN CARBON MONOXIDE ENVIRONMENT; [Sifat Fizikal dan Kimia terhadap Tindak Balas Penurunan Kromium yang Didopkan kepada Molibdenum Oksida di dalam Persekitaran Karbon Monoksida]
title_fullStr PHYSICAL AND CHEMICAL PROPERTIES ON REDUCTION BEHAVIOUR OF CHROMIUM DOPED TO MOLYBDENUM OXIDE IN CARBON MONOXIDE ENVIRONMENT; [Sifat Fizikal dan Kimia terhadap Tindak Balas Penurunan Kromium yang Didopkan kepada Molibdenum Oksida di dalam Persekitaran Karbon Monoksida]
title_full_unstemmed PHYSICAL AND CHEMICAL PROPERTIES ON REDUCTION BEHAVIOUR OF CHROMIUM DOPED TO MOLYBDENUM OXIDE IN CARBON MONOXIDE ENVIRONMENT; [Sifat Fizikal dan Kimia terhadap Tindak Balas Penurunan Kromium yang Didopkan kepada Molibdenum Oksida di dalam Persekitaran Karbon Monoksida]
title_sort PHYSICAL AND CHEMICAL PROPERTIES ON REDUCTION BEHAVIOUR OF CHROMIUM DOPED TO MOLYBDENUM OXIDE IN CARBON MONOXIDE ENVIRONMENT; [Sifat Fizikal dan Kimia terhadap Tindak Balas Penurunan Kromium yang Didopkan kepada Molibdenum Oksida di dalam Persekitaran Karbon Monoksida]
publishDate 2023
container_title Malaysian Journal of Analytical Sciences
container_volume 27
container_issue 2
doi_str_mv
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85159136440&partnerID=40&md5=6f876331ad16e8074c133a9d72591ffe
description This study aimed to investigate the influence of added chromium on the physical and chemical reduction behavior of molybdenum trioxide (MoO3) in a carbon monoxide (CO) environment. The reduction behavior of the sample was evaluated by using temperature-programmed reduction (TPR), and the phases produced by the reduced samples were analyzed using X-ray diffraction spectroscopy (XRD) and field emission scanning electron microscopy (FESEM). The TPR study was conducted using two reduction modes: non-isothermal reduction at 700°C with 20 vol. % of CO in nitrogen (N2), followed by isothermal reduction at 700°C for an additional 60 min. The TPR profile showed that the reduction of doped and undoped MoO3 was preceded by two reduction stages (MoO3 → Mo4O11 → MoO2), wherein, the reduction of doped MoO3 starting at a lower temperature (380°C-500°C) than that of undoped MoO3 (550°C). Additionally, based on XRD analysis, it was shown that the conversion of MoO3 to MoO2 under CO generated an intermediate product known as Mo4O11. It is discovered that, increasing the concentration of chromium doped to MoO3 enhanced the reducibility of oxide due to the rapid production of MoO2 phases at T: 380ºC. Further heating under CO atmosphere, carbide species built up in the form of Mo2C rather than metallic Mo which might be due to excess of CO exposure to the surface layer of oxide. © 2023, Malaysian Society of Analytical Sciences. All rights reserved.
publisher Malaysian Society of Analytical Sciences
issn 13942506
language English
format Article
accesstype
record_format scopus
collection Scopus
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