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 language | Malay |
|---|---|
| Pages (from-to) | 1510-1514 |
| Number of pages | 5 |
| Journal | Malaysian Journal of Analytical Sciences |
| Volume | 20 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2016 |
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ASJC Scopus subject areas
- Analytical Chemistry
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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 journal › Article
}
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
VL - 20
SP - 1510
EP - 1514
JO - Malaysian Journal of Analytical Sciences
JF - Malaysian Journal of Analytical Sciences
SN - 1394-2506
IS - 6
ER -