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在动态和平衡条件下,研究了H_2PtCl_6在各种氧化铝载体上的吸附.红外光谱和紫外可见漫反射谱用于表征浸渍H_2PtCl_6前后载体的表面性质.结果表明,H_2PtCl_6在载体上的吸附量取决于氧化铝的Lewis酸性.当载体具有很高的吸附活性时,吸附速率与载体表面性质无关,但受控于孔道扩散.从表面活性羟基变化的角度,探讨了吸附量与酸性的关系.
Under dynamic and equilibrium conditions, the adsorption of H 2 PtCl 6 on various alumina supports was studied. The infrared spectrum and UV-Vis diffuse reflectance spectra were used to characterize the surface properties of the support before and after H 2 PtCl 6 impregnation. The results show that the adsorption capacity of H 2 PtCl 6 on the support depends on On the Lewis acidity of alumina.When the carrier has a high adsorption activity, the adsorption rate has nothing to do with the surface properties of the carrier, but is controlled by the pore diffusion.According to the change of the surface active hydroxyl, the relationship between the adsorption capacity and acidity is discussed.