Pellet-type and Ceramic Reactors

1 Reactor 12 [R12] Alumina Tablets Equipped Parallel Cas-phase Reactor 

The above-described set-up has been used for the primary screening of various reactions, e.g. the dehydrogenation of cyclohexane using different catalyst compositions of the ternary system Pt/Sn/In [64], Concerning this first example, a collection of 66 catalyst combinations was operated for 24 h to check the long-term behavior. All combinations show deactivation, especially the most active catalysts. This clearly demonstrated that screening also depends very much on the selection of the appropriate time scale for a reaction (in this study, at least 24 h). 

In the second example, the selective oxidation of propylene to propylene oxide (PO) was investigated with a huge library of y-alumina pellets impregnated with various single metals, binary metal combinations and catalyst loadings [40], 

To focus only on the binary compositions, the catalysts were evaluated under the following experimental conditions feed 40% propylene and 10% oxygen temperature, 250 °C and 20 000 h-1 of GHSV (gas hourly space velocity). Three different catalyst preparation procedures were used [40]  

Selection from periodic groups. Two elements, one PO active and the other PO inactive, were selected from each periodic group, resulting in 153 different catalysts in total. 

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