A novel heterogeneous Al2O3–Pd catalyst has been prepared by the sol–gel method; bayberry tannin (BT) was used as stabilizer to prevent the migration and aggregation of Pd species during calcination. According to N2 adsorption/desorption determination, Al2O3–Pd has a mesoporous structure and its specific area is as high as 336.5 m2/g. Transmission electron microscopy observation indicated that the size of the Pd particles was greatly reduced by the presence of BT. On the basis of X-ray photoelectron spectra analysis, it was found that the most of Pd nanoparticles were dispersed in the pores, implying that BT can prevent migration of Pd particles from the pores to the outer surface of Al2O3 during calcination. For comparison, Al2O3–Pd* was prepared by the sol–gel method but without use of BT. In the hydrogenation of acrylic acid, Al2O3–Pd had high catalytic activity and excellent reusability compared with commercial and traditionally prepared heterogeneous Pd catalysts. The turnover number of Al2O3–Pd is as high as 11,328.0 mol/mol after recycling seven times, which is much higher than that of a commercial Pd–C catalyst (8048.0 mol/mol).
Research on Chemical Intermediates – Springer Journals
Published: Feb 3, 2012
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