BASE CATALYSIS ON ZEOLITES IN THE FORMALDEHYDE-DIMETHYLAMINE TRANSFORMATIONS

The character of catalytic transformations in the 'dimethylamine-forma ldehyde-water' system was studied using ZSM-5 and Beta zeolites as cat alysts, in which the concentration of strong protic centers has been v aried by the chemical modification. It is shown that both the acidity of the zeolite and reaction temperature determine the direction of the transformation in the system. The decrease of these both parameters r esults in the growth of N,N-dimethylformamide yield, while the increas e of the acidity of the zeolite and reaction temperature leads to cons iderable predominance of 1,3,5-triazine derivative in the products. Th e possibility of the creation of basic catalytic sites by the weak int eraction of dimethylamine molecules with low-acidic zeolite during the reaction is supposed to be a key factor, which determines the prevale nt transformation route in the system.