Abstract
PA-Na-x and PA-H-1 catalysts were prepared by a cation-assisted polyol method using different Pd sources (Na2PdCl4 or H2PdCl4) and pH values (x = 1, 2, 3 or 5), and applied to solvent-free oxidation of benzyl alcohol (BzOH). As confirmed by multiple analytical characterizations, the base number, Pd0 content and abundance of oxygen vacancies for PA-Na-x prepared were higher than those on PA-H-1, and their synergistic effect made PA-Na-x possess the higher BzOH conversion and benzaldehyde selectivity. The contents of Pd0 and oxygen vacancies on PA-Na-x showed an inverted volcano trend with the increase of the pH value. PA-Na-x also followed the inverted volcano order for the catalytic activity, where PA-Na-1 prepared from Na2PdCl4 at pH 1 exhibited the best catalytic efficiency with a turnover frequency of 29.5 s−1 and 94.8% selectivity of benzaldehyde, and excellent stability. This study provided an efficient method of preparing nano-Pd catalysts.
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