For 2-butanone, the dimers present the main product with 8 % yield whereas the yield of the aromatic triethylbenzenes is 5 %. The lower catalyst activity is owed to the lower reactivity of 2butanone and its steric hindrance due to the longer alkyl chain. The latter is also responsible that in comparison to acetone, a higher variety of isomers can be formed. The total carbon balance for the conversion of 2-butanone is therefore 80 %, whereas the total product selectivity for dimers, aromatics and trimers is 48 %. As a side product propionic acid was detected in low amounts.