Reaction Laws and Macro-Kinetics of 4-Carboxybenzaldehyde Hydrogenation over Pd/TiO₂ Catalyst

Abstract:

The effects of temperature and hydrogen partial pressure on 4-Carboxybenzaldehyde (4-CBA) hydrogenation over Pd/TiO2 catalyst were investigated in a batch reactor. The results show that 4-CBA hydrogenation is a consecutive reaction. And 4-CBA hydrogenation to 4-hydroxymethylbenzoic (4-HMBA) is a reversible exothermic reaction. Meanwhile, a parallel reaction of 4-CBA decarbonylation occurs during the process. The hydrogenation rate of 4-HMBA is more sensitive to temperature and hydrogen partial pressure than that of 4-CBA. Macro-kinetics of 4-CBA reaction over Pd/TiO2 was obtained from the experimental data using the power-law kinetics model. The apparent activation energies of 4-CBA hydrogenation, 4-HMBA hydrogenation, 4-CBA decarbonylation and 4-HMBA dehydrogenation are 29.65 kJ/mol, 42.55 kJ/mol, 74.32 kJ/mol and 69.34 kJ/mol, respectively. The reaction orders with respect to 4-CBA and 4-HMBA are both first-order.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 587-594
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.587
• Online since: January 2013
• Authors: Jin Cheng Gao, Ji Yuan Wang, Wen Bin Du, Ling Lin, Chong Yu Zeng
• Keywords: 4-Carboxybenzaldehyde Hydrogenation, Macro-Kinetics, Pd/TiO₂ Catalyst, Reaction Laws

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