Preparation and Characterization of TiO₂ Support for Pd Catalysts: Application in Hydrogenation of 4-Carboxybenzaldehyde

Abstract:

The formed TiO₂ supports were prepared by compression method and then used in the Pd/TiO2 catalytic hydrogenation of 4-carboxybenzaldehyde (4-CBA). Supports and catalysts were characterized by the intensity test, BET, XRD, SEM and ICP techniques. Results showed that the pore-forming agent can adjust both the specific surface and average pore diameter. The suitable content is 4 wt.%. Silicon additive inhibits the growth of TiO₂ grain and the anatase-rutile phase transformation. Forming pressure brings out a certain crushing strength and pore characteristic. The crushing strength of support significantly increases with increasing support calcination temperature. However, the specific surface and pore volume decrease. The TiO₂ support has the side crushing strength of 122 N/cm and the specific surface of 38 m2/g at the optimum preparation conditions of silicon additive of 4 wt.%, forming pressure of 150 MPa and calcination temperature of 700 °C. A series of Pd/TiO2 catalysts were prepared by incipient wetness of impregnation and liquid-phase chemical reduction method. On Pd/TiO2700 (Pd, 0.5 wt.%) catalyst, the 99.5% conversion of 4-CBA is obtained after reaction for 90 min at reaction temperature of 280 °C and hydrogen partial pressure of 0.6 MPa.

• Periodical: Advanced Materials Research (Volumes 361-363)
• Pages: 584-592
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.361-363.584
• Online since: October 2011
• Authors: Yu Kan, Kai Li, Ji Yuan Wang, Ling Lin, Chong Yu Zeng
• Keywords: Compression Method, Hydrogenation of 4-CBA, Pd/TiO₂, TiO₂ Support

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