Shape-Selective Synthesis of Collidines over Modified Zeolites

The shape-selective cyclization of 2-butanone with formaldehyde and ammonia to trimethyl- (collidines) and tetramethyl pyridines was investigated over ZSM-5 catalysts modified by various cations and prepared by conventional impregnation. The shape-selective nature of the catalyst was studied using isobutyl alcohol, 2-butanol, and t-butyl alcohol.