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Various supported catalysts are widely used and applied for industrial catalytic reactions. The concentration distribution of the catalytic component in the support is known to have a strong effect on the overall catalytic activity. It is, therefore, of great importance that the catalytic component be distributed in the support properly controlled.In the present work, an attempt was made to investigate both qualitatively and quantitatively the process of distributed deposition of the catalytic component in the radial direction and to carry out a series of experiments by taking an example of impregnation of palladium chloride on alumina particles.The mechanism of impregnation of the catalytic component has been generally explained as a combined process of diffusion and adsorption of the solute into the pores1)-4). Though this can give a qualitative description for the occurrence of distributed deposition, the concentration profils cannot be explained quantitatively.It was found that the feature of concentration profile, particularly the characteristic of having a peak in the middle of the radius (Figs. 5, 7, 8), could be explained by the diffusion mechanism where the pH value distribution was taken into consideration (Fig. 1).It was found experimentally that the controlling factors for determining the concentration distribution were the initial pH value (Fig. 5) and the initial Pd concentration in the bulk solution (Fig. 7), the volumetric ratio of the bulk solution to the carrier particles (Fig. 8), and the operating temperature. It was proved experimentally that desirable concentration distribution could be achieved by controlling these factors (Fig. 9).Furthermore, in addition to the simple operation of impregnation, various modified operating procedures such as keeping the pH value in the bulk solution constant (Fig. 11), pretreating the particles with HCl and NaOH (Fig. 10) or impregnating in two stages (Fig. 12) were tried and found them to be effective for controlling the concentration profile predicted by the proposed mechanism.
- 公益社団法人 石油学会の論文
公益社団法人 石油学会 | 論文
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