Influence of Zr Additive on the Chemical Reduction Behaviour of MoO₃ in Carbon Monoxide Atmosphere

Abstract:

Temperature-programmed reduction (TPR) was used to observe the chemical reduction behaviour of molybdenum trioxide (MoO₃) and zirconia (Zr)-doped MoO₃ catalyst by using carbon monoxide (CO) as the reductant. The characterisation of catalysts was performed by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and transmission electron microscopy (TEM) analyses. The reduction performance were examined up to 700°C and reduction was continued for 60 min at 700°C in a stream of 20 vol. % CO in nitrogen. The TPR profile showed that the doped MoO­₃ catalyst was slightly moved to a higher temperature (580°C) as compared to the undoped MoO₃ catalyst, which began at around 550°C. The interaction between zirconia and molybdenum ions in doped MoO₃ catalyst led to an increase in the reduction temperature. According to characterisation of the reduction products by using XRD, it revealed that the reduction behaviour of pure MoO₃ to MoO₂ by CO reductant involved two reduction stages with the formation of Mo₄O₁₁ as the intermediate product. Meanwhile, MoO₃ catalyst doped with zirconia caused a delay in the reduction process and was proven by the presence of Mo₄O₁₁ species at the end of reactions. Physical analysis by using BET showed a slight increase in surface area of 3% Zr-MoO₃ from 6.85 m²/g to 7.24 m²/g. As for TEM analysis, black tiny spots located around MoO₃ particles revealed that the zirconia was successfully intercalated into MoO₃ particles. This confirmed that formation of intermetallic between Zr-MoO₃ catalyst will give new chemical and physical properties which has a remarkable chemical effect by disturbing the reduction progression of MoO₃ catalyst.

• Periodical: Solid State Phenomena (Volume 317)
• Pages: 173-179
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.317.173
• Online since: May 2021
• Authors: Alinda Samsuri*, Mohd Nor Latif, Norliza Dzakaria, Fairous Salleh, Maratun Ajina Abu Tahari, Tengku Shafazila Tengku Saharuddin, Mohd Ambar Yarmo
• Keywords: Carbon Monoxide, Molybdenum Oxide, Reduction, Zirconia

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