Acid–base catalysis: on the example of ethylenimine production Original Research Article

The solid acid–base catalysts comprising of SiO2–Xm–Pn–Op (X: alkali metal, alkaline earth metal) showed high catalytic activity and selectivity in vapour phase intramolecular dehydration of monoethanolamine (MEA) to ethylenimine (EI). These catalysts have acid sites and basic sites that were controlled extremely week (+4.8