Journal
CATALYSIS COMMUNICATIONS
Volume 9, Issue 13, Pages 2257-2260Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2008.05.012
Keywords
hydrogenation catalysts; Pd@SiO2; core-shell-nanoparticles; 4-carboxy-benzaldehyde; porous shell structure
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Pd@SiO2 core-shell-particles were prepared by coating silica onto the surface of Pd-polyvinylpyrrolidone (PVP) colloids, according to the Stober method. These particles were characterized with SEM, TEM, nitrogen adsorption/desorption, XRD, CO chemisorption, and were used to catalyze the hydrogenation of 4-carboxybenzaldehyde (4-CBA) to p-toluic acid (PT). The maximum PT yield (around 99%) occurred at 160-175 degrees C, which was much lower than the temperature (250-270 degrees C) used in the commercial terephthalic acid refining process (with a Pd/C catalyst). (C) 2008 Elsevier B.V. All rights reserved.
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