Effect of tungsten addition to Pd/ZrO₂ system in the hydrodechlorination activity of CCl₂F₂

Krishna Murthy, J.; Chandra Shekar, S.; SivaKumar, V.; David Raju, B.; Sreedhar, B.; Sai Prasad, P.S.; Kanto Rao, P.; Rama Rao, K.S.; Berry, F. J. and Smart, L. E. (2004). Effect of tungsten addition to Pd/ZrO₂ system in the hydrodechlorination activity of CCl₂F₂. Journal of Molecular Catalysis A: Chemical, 223(1-2) pp. 347–351.

DOI: https://doi.org/10.1016/j.molcata.2003.11.047

Abstract

The catalytic activity of Pd on W-ZrO₂ in the hydrodechlorination of CCl₂F₂ was studied by varying WO₃ content. The TPR results of Pd/W-ZrO₂ were related to effects caused by contact with hydrogen. XRD data of spent catalysts shows that there is no change in the structure of zirconia indicating that these catalysts are highly resistant to the corrosive reaction atmosphere. Addition of tungsten to Pd/ZrO₂ system led to the formation of CHClF₂ (HCFC-22) in the hydrodechlorination of CCl₂F₂. Thus, the role of WO3 istocatalyze the partial dechlorination of CCl₂F₂.

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