Transformation of Hexoses on Natural and Synthetic Zeolites

A number of zeolite catalysts based on synthetic powder zeolites and natural Ukrainian clinoptilolite as well as mordenite-clinoptilolite zeolite rocks were synthesized. The activity and selectivity of the prepared samples were compared in glucose and fructose dehydration into 5-hydroxymethylfurfural in a dimethyl sulfoxide environment.

Fructose Transformation into 5-Hydroxymethylfurfural over Natural Transcarpathian Zeolites

Based on Transcarpathian zeolite the catalysts in calcium-lanthanum-ammonium form were synthesized and modified by steaming and dealumination with ethylenediaminetetraacetic acid. The samples were characterized by using nitrogen adsorption/desorption, XRD, XRF, and FTIR-spectroscopy. The yield of 5 hydroxymethylfurfural over modified samples at 433 K was found to be 50 and 83% at a practically full conversion of fructose.