3.2.6. Activity Test

The self-aldol condensation of cyclopentanone was conducted in a 20 mL stainless steel batch reactor with Teflon lining. Typically, 4.0 g cyclopentanone and 1.0 g catalyst were used. Before each reaction, the reactor was purged with nitrogen for 30 s. Then the reactor kept stirring at 180 ◦C for 2 h. After the reaction, the reactor was quenched to room temperature with water. The products were taken out and dissolved in 96 g 1% cyclohexanone (internal standard)—ethanol solution. The solution was filtrated, diluted with ethanol, and analyzed by a Varian 450-GC. Before the test, the catalysts were calcined at the required temperature.
