Methylstyrene, hydrogenation

Fig. 47. In silu study of a-methylstyrene hydrogenation in a fixed bed of Pd/ALO catalyst, (a) Schematic representation of the bed and the chosen axial bar. (b) A mixed spatial-spectral 2-D map which corresponds to that axial bar. (c) The distribution of the liquid phase along the axial bar obtained as an integral projection of (b) on its vertical (coordinate) axis, (d f) NMR spectra of the liquid phase at various heights along the bar obtained as horizontal cross-sections of the map in (b). The location of these cross-sections is indicated in (b,c) with horizontal lines. Each spectrum corresponds to a volume of 0.66mmx 1.3mmx 2mm. The two vertical dotted lines are drawn to show the differences in relative positions of the external peaks in the spectra. Reprinted from reference (69) with permission from Elserier, Copyright (2004).

Tada, M., Sasaki, T. and Iwasawa, Y. Design of a novel molecular-imprinted Rh-amine complex on Si02 and its shape-selective catalysis for alpha-methylstyrene hydrogenation, J. Phys. Chem. B, 2004, 108, 2918-2930. 

Reactor model for the test reaction of a-methylstyrene hydrogenation is developed based on the following assumptions 1. Reaction occurs only in the liquid phase on the solid catalyst. 

Figure 2.1.9. Effect of gas and liquid velocities using a high activity catalyst for a-methylstyrene hydrogenation (after Herskovzitz, M. and S. Mosseri [26]).

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