Quaternary ammonium salts for hydrotalcite-type catalysts synthesis

Tetra Methyl Ammonium Hydroxide as well as Tetra n-Butyl Ammonium Hydroxides represent a feasible alternative to inorganic alkalis for hydrotalcites synthesis. For the most part, the washing step in the synthesis of hydrotalcites by inorganic alkalis generates a large amount of wastewater that must be processed afterwards generating high costs and environmental problems. The organic alkalis conduct the system towards smaller amounts of wastewater ( reconstructed samples > dried samples. This tendency is in line with the strength of the base sites involved. However, all investigated solids generate 100% in the selectivity to 3-ethoxypropionitrile.