采用二三种不同孔结构的Si0_2制备了Pd-SiW_(12)/SiO_2催化剂,通过x射线衍射、N_2物理吸附、吡啶吸附红外光谱以及H2脉冲化学吸附对催化剂进行了表征,并考察了Pd-SiW_(12)/SiO_2催化剂上乙烯直接氧化制乙酸反应性能.结果表明,以孔径较大的粗孔硅胶为载体制备的Pd-SiW_(12)/SiO_2催化剂显示出最高的催化活性,乙酸收率为145.2g/(L·h).这是由于Pd在粗孔硅胶载体表面良好的分散使其具有较高的催化活性.
The Pd-SiW_(12)/SiO_2 catalysts with different pore structure of SiO_2 were prepared for direct oxidation of ethylene to acetic acid. The catalysts were characterized by X-ray diffraction, N2 physical adsorption, infrared spectroscopy of adsorbed pyridine, and H_2-pulse chemical adsorption. The results showed that the pore structure of SiO_2 had an important influence on the catalytic performance of the catalysts. The Pd-SiW_(12)/SiO_2 catalyst prepared by the SiO_2 support with larger pore size and pore distribution exhibited the highest catalytic activity, on which 145.2 g/(L·h) of acetic acid yield was obtained. Pd dispersion was responsible for the catalytic activity of the Pd-SiW_(12)/SiO_2 catalyst.
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