Search

The supported palladium catalysts were prepared by depositing Pd colloidal particles on boehmite, and then promoted by lanthanum oxide. The samples were characterized by transmission electron microscopy, powder x-ray diffraction, scanning electron microscopy, and energy dispersive x-ray spectroscopy, and studied in hydrogenation of 2-tertiary butyl anthraquinone (BAQ) to 2-tertiary butyl anthrahydroquinone (BAQH4) for H2O2 production. Compared to the catalyst prepared by metal salt impregnation method, the supported Pd nanoparticles catalyst showed high catalytic activity. Superior catalytic activity of the catalyst was related to the high dispersion of the active components and the existence of lanthanum oxide as an effective promoter, which may promote the catalytic activity both electronically and morphologically. The reaction kinetics for the catalytic hydrogenation of BAQ to BAQH2 can be described by equation r = kC BAQ  · p H 2 , and the apparent activation energy is 38 kJ · mol−1. [ABSTRACT FROM PUBLISHER]