Reduction and carburization behavior of NiO–WO3 mixtures by carbon monoxide

Effect of Zirconia and Nickel Doping on the Reduction Behavior of Tungsten Oxide in Carbon Monoxide Atmosphere

“…Reduction of WO 3 occurred at temperatures higher than 650 º C. It has been reported at temperatures above 900 º C, the carburization to WC take place, otherwise W 2 C would be the primary carbide [3].…”

“…It is due to their good in hardness which close to diamond and has great abrasion, low coefficient of thermal expansion and corrosion resistance. The properties is crucial in manufacturing industry for metal, forming tools and dies, mining and abrasive tools which can be employed in high pressure, temperature, and corrosion circumstances [3], [4].…”

“…Moreover, carbon monoxide also can be used as a reducing agent [8] was studied the reduction of WO 3 2.72 , and (ii) high temperature stage (> 777 º C) which reduce WO 2 to Wº [9].…”

“…The reduction of WO 3 was investigated under 40 % CO in N 2 as a reducing agent by using the temperature programmed 3 . The compounds were dissolved in water with additional of ethanol at 60º C with stirring for 4 hours, producing a viscous mixture.…”

Study on the Reduction Behaviour of Nickel Doped Molybdenum Trioxide by Using Carbon Monoxide as Reductant

“…The strong interaction between nickel ions and molybdenum ions in the samples leads to changes in the coordination environment of molybdenum and the strength of Mo-O bonds [10]. The catalytic effect of Ni which enhances CO absorption and C deposition also causes the decreasing of reduction temperature [14]. The phases formed after the reduction by TPR were analysed by recording XRD pattern of the residual obtained after selected reduction condition.…”