The stability of the Siralox 30 catalyst was evaluated under the optimum reaction conditions. In a long-term experiment, it could be shown that the catalyst remains stable for more than 50 hourson-stream despite the comparatively harsher reaction conditions (Figure ). This clearly demonstrates that the mesoporous ASA is a superior catalyst in the acetone aromatization to mesitylene. Based on these findings, Siralox 30 was also tested for the conversion of 2-butanone under the optimized reaction conditions. The aromatic self-condensation product of 2-butanone is triethylbenzene that could be used as a potential precursor to styrene-type monomers. While Siralox 30 is stable for the conversion of this larger alkyl methyl ketone for more than 40 hourson-stream, the catalytic activity is reduced compared to the conversion of acetone (Figure ).