Selective hydrogenation of o-chloronitrobenzene over palladium supported nanotubular titanium dioxide derived catalysts

Titania derived nanotubes were synthesized by treating P-25 Degussa TiO 2 with a concentrated (18 M) KOH solution. Ageing the material in KOH solution for 2 days resulted in formation of tubular titania and Raman analysis revealed that the material has a titanate structure. The synthesized material...

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Bibliographic Details
Published in:Catalysis communications 2007-12, Vol.8 (12), p.1999-2006
Main Authors: Sikhwivhilu, Lucky M., Coville, Neil J., Pulimaddi, Basha M., Venkatreddy, Jayasri, Vishwanathan, Venkataraman
Format: Article
Language:English
Subjects:
Hydrogenation
Nanotubular titanate
ortho-Chloroaniline
ortho-Chloronitrobenzene
Titanium dioxide
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Summary:Titania derived nanotubes were synthesized by treating P-25 Degussa TiO 2 with a concentrated (18 M) KOH solution. Ageing the material in KOH solution for 2 days resulted in formation of tubular titania and Raman analysis revealed that the material has a titanate structure. The synthesized material was used as a catalyst support for the hydrogenation of ortho-chloronitrobenzene ( o-CNB) with Pd as the active phase. The vapour-phase hydrogenation of o-CNB was carried out in ethanol at 523 K and atmospheric pressure over a Pd/TiO 2 derived nanotube catalyst (Pd/TiO 2-M). Pd/TiO 2-M gave complete conversion (100%) of o-CNB with the selectivity to ortho-chloroaniline ( o-CAN) of 86%. The stability of the Pd/TiO 2-M catalyst was tested over 5 h during which time the conversion slowly dropped to 80% (selectivity 93%) due to catalyst poisoning. TPR analysis revealed the existence of a strong palladium-support interaction and this was found to be crucial to the overall activity of the catalyst.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2007.03.023