Semi-automated Impregnation Method

Continuous flow reactors allow a new way of catalyst preparation. The fluidic pathways can be used for the transport of impregnation liquid or solid particles if means are supplied to localize the catalysts at defined positions inside the reactor. One possibility is the flow impregnation of wash-coated micro structures with catalyst solutions [38], 

The time for the preparation of the 48 single mixtures could thus be reduced from several days to about 24 h, of which 20 h can be fully automated. Hence the time for the sample preparation was in the same range as the estimated time for the forthcoming sample testing and analysis with the parallel reactor (see Table 3.1). 

Depends on the desired amount of catalyst in the alumina layer 1 h is often sufficient. Note only the time for the penetration of the liquid into the pores is considered. The time for the preparation of the impregnants is not included because this can be done by a laboratory sample robot. 

T Depends on the catalytic reaction. In order to hold the layer stable during the reaction, the calcination temperature should be higher than the reaction temperature [38]. 

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