Hydrogenation of nitrobenzene over palladium-supported catalysts—Effect of support

• Published in: Applied catalysis. A, General General, 2009-02, Vol.353 (2), p.160-165
• Main Authors: Sangeetha, P., Shanthi, K., Rao, K.S. Rama, Viswanathan, B., Selvam, P.
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Exact sciences and technology; General and physical chemistry; Hydrogenation; Hydrotalcite; MgO; Palladium; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; γ-Al 2O 3
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2008.10.044

Vapor phase hydrogenation of nitrobenzene is reported on 1 wt.% Pd supported on hydrotalcite, MgO and (-Al 2O 3 catalysts. The catalysts were prepared in the laboratory using a wet impregnation method and were characterized by XRD, BET surface area, TPR, TEM, XPS and CO chemisorption studies. The Turnover frequency for HT-supported Pd was found to be higher than on MgO and (-Al 2O 3 supported catalysts. Thus, hydrotalcite has been found to be an effective support for Pd catalyst, for aniline formation from nitrobenzene via hydrogenation. ▪ Vapor phase hydrogenation of nitrobenzene is reported on 1 wt.% Pd supported on hydrotalcite, MgO and γ-Al 2O 3 catalysts. The catalysts were prepared in the laboratory using a wet impregnation method and were characterized by XRD, BET surface area, TPR, TEM, XPS and CO chemisorption studies. The conversion of nitrobenzene was studied in the temperature region of 498–573 K and compared on all the catalysts. An impressive catalytic performance of nitrobenzene conversion was observed on hydrotalcite supported Pd catalyst. CO chemisorption and TEM results prove that palladium disperses better on hydrotalcite supports when compared with other conventional supports such as MgO and γ-Al 2O 3, which is responsible for the high conversion of nitrobenzene.