Kelakuan penurunan tungsten dioksida oleh kepekatan karbon monoksida yang berbeza

Translated title of the contribution: Reduction behaviour of tungsten dioxide by various concentration of carbon monoxide

Fairous Salleh, Alinda Samsuri, Tengku Shafazila Tengku Saharuddin, Mohamed Wahab Mohamed Hisham, Rizafizah Othaman, Mohd. Ambar Yarmo

Research output: Contribution to journalArticle

Abstract

The reduction behaviour of tungsten dioxide (WO2) under both non-isothermal and isothermal conditions in various concentrations of carbon monoxide (CO) were investigated by using temperature-programmed reduction (TPR) and X-ray diffractometry (XRD) techniques. The influences of carbon monoxide concentration (20 and 40% v/v CO in N2) on the reducibility of WO2 to tungsten metal W have been investigated in the temperature range 40 - 900 °C. The TPR profile shows that reduction using 40% CO produce higher thermal conductivity detector (TCD) signal in comparison by using 20 % CO. XRD results show that, by increasing the concentration of CO, the intensity of WO2 decreases and tungsten carbide (WC) peak appeared. Moreover, holding the reduction time for 30 min in 20 and 40% of CO resulted in the formation of new peak of tungsten hemi carbide (W2C) and WC, respectively. It can be concluded that by using CO, reduction steps comprise of WO2 → W → W2C → WC. The reduction behaviour of WO2 is strongly dependent on the concentration of CO and hold time of reaction. Furthermore, excess of CO by isothermal reduction results in the formation of WC.

Original languageMalay
Pages (from-to)1510-1514
Number of pages5
JournalMalaysian Journal of Analytical Sciences
Volume20
Issue number6
DOIs
Publication statusPublished - 2016

Fingerprint

Tungsten
Carbon Monoxide
X ray diffraction analysis
Tungsten carbide
Temperature
Thermal conductivity
Metals
Detectors

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Kelakuan penurunan tungsten dioksida oleh kepekatan karbon monoksida yang berbeza. / Salleh, Fairous; Samsuri, Alinda; Saharuddin, Tengku Shafazila Tengku; Hisham, Mohamed Wahab Mohamed; Othaman, Rizafizah; Yarmo, Mohd. Ambar.

In: Malaysian Journal of Analytical Sciences, Vol. 20, No. 6, 2016, p. 1510-1514.

Research output: Contribution to journalArticle

Salleh, Fairous ; Samsuri, Alinda ; Saharuddin, Tengku Shafazila Tengku ; Hisham, Mohamed Wahab Mohamed ; Othaman, Rizafizah ; Yarmo, Mohd. Ambar. / Kelakuan penurunan tungsten dioksida oleh kepekatan karbon monoksida yang berbeza. In: Malaysian Journal of Analytical Sciences. 2016 ; Vol. 20, No. 6. pp. 1510-1514.
@article{420baf55f6da4845a55ded960990aa9f,
title = "Kelakuan penurunan tungsten dioksida oleh kepekatan karbon monoksida yang berbeza",
abstract = "The reduction behaviour of tungsten dioxide (WO2) under both non-isothermal and isothermal conditions in various concentrations of carbon monoxide (CO) were investigated by using temperature-programmed reduction (TPR) and X-ray diffractometry (XRD) techniques. The influences of carbon monoxide concentration (20 and 40{\%} v/v CO in N2) on the reducibility of WO2 to tungsten metal W have been investigated in the temperature range 40 - 900 °C. The TPR profile shows that reduction using 40{\%} CO produce higher thermal conductivity detector (TCD) signal in comparison by using 20 {\%} CO. XRD results show that, by increasing the concentration of CO, the intensity of WO2 decreases and tungsten carbide (WC) peak appeared. Moreover, holding the reduction time for 30 min in 20 and 40{\%} of CO resulted in the formation of new peak of tungsten hemi carbide (W2C) and WC, respectively. It can be concluded that by using CO, reduction steps comprise of WO2 → W → W2C → WC. The reduction behaviour of WO2 is strongly dependent on the concentration of CO and hold time of reaction. Furthermore, excess of CO by isothermal reduction results in the formation of WC.",
keywords = "Carbon monoxide, Tungsten, Tungsten carbide, Tungsten dioxide",
author = "Fairous Salleh and Alinda Samsuri and Saharuddin, {Tengku Shafazila Tengku} and Hisham, {Mohamed Wahab Mohamed} and Rizafizah Othaman and Yarmo, {Mohd. Ambar}",
year = "2016",
doi = "10.17576/mjas-2016-2006-32",
language = "Malay",
volume = "20",
pages = "1510--1514",
journal = "Malaysian Journal of Analytical Sciences",
issn = "1394-2506",
publisher = "Faculty of Science and Technology, Universiti Kebangsaan Malaysia",
number = "6",

}

TY - JOUR

T1 - Kelakuan penurunan tungsten dioksida oleh kepekatan karbon monoksida yang berbeza

AU - Salleh, Fairous

AU - Samsuri, Alinda

AU - Saharuddin, Tengku Shafazila Tengku

AU - Hisham, Mohamed Wahab Mohamed

AU - Othaman, Rizafizah

AU - Yarmo, Mohd. Ambar

PY - 2016

Y1 - 2016

N2 - The reduction behaviour of tungsten dioxide (WO2) under both non-isothermal and isothermal conditions in various concentrations of carbon monoxide (CO) were investigated by using temperature-programmed reduction (TPR) and X-ray diffractometry (XRD) techniques. The influences of carbon monoxide concentration (20 and 40% v/v CO in N2) on the reducibility of WO2 to tungsten metal W have been investigated in the temperature range 40 - 900 °C. The TPR profile shows that reduction using 40% CO produce higher thermal conductivity detector (TCD) signal in comparison by using 20 % CO. XRD results show that, by increasing the concentration of CO, the intensity of WO2 decreases and tungsten carbide (WC) peak appeared. Moreover, holding the reduction time for 30 min in 20 and 40% of CO resulted in the formation of new peak of tungsten hemi carbide (W2C) and WC, respectively. It can be concluded that by using CO, reduction steps comprise of WO2 → W → W2C → WC. The reduction behaviour of WO2 is strongly dependent on the concentration of CO and hold time of reaction. Furthermore, excess of CO by isothermal reduction results in the formation of WC.

AB - The reduction behaviour of tungsten dioxide (WO2) under both non-isothermal and isothermal conditions in various concentrations of carbon monoxide (CO) were investigated by using temperature-programmed reduction (TPR) and X-ray diffractometry (XRD) techniques. The influences of carbon monoxide concentration (20 and 40% v/v CO in N2) on the reducibility of WO2 to tungsten metal W have been investigated in the temperature range 40 - 900 °C. The TPR profile shows that reduction using 40% CO produce higher thermal conductivity detector (TCD) signal in comparison by using 20 % CO. XRD results show that, by increasing the concentration of CO, the intensity of WO2 decreases and tungsten carbide (WC) peak appeared. Moreover, holding the reduction time for 30 min in 20 and 40% of CO resulted in the formation of new peak of tungsten hemi carbide (W2C) and WC, respectively. It can be concluded that by using CO, reduction steps comprise of WO2 → W → W2C → WC. The reduction behaviour of WO2 is strongly dependent on the concentration of CO and hold time of reaction. Furthermore, excess of CO by isothermal reduction results in the formation of WC.

KW - Carbon monoxide

KW - Tungsten

KW - Tungsten carbide

KW - Tungsten dioxide

UR - http://www.scopus.com/inward/record.url?scp=85003434317&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85003434317&partnerID=8YFLogxK

U2 - 10.17576/mjas-2016-2006-32

DO - 10.17576/mjas-2016-2006-32

M3 - Article

AN - SCOPUS:85003434317

VL - 20

SP - 1510

EP - 1514

JO - Malaysian Journal of Analytical Sciences

JF - Malaysian Journal of Analytical Sciences

SN - 1394-2506

IS - 6

ER -