New catalysts based on heteropolyacids-zeolite systems for paraffins cracking in the long chain α-olefins synthesis

Abstract

Natural zeolites (clinoptilolite) of Shankanayskoe field in Almaty region are used to create catalysts for the synthesis of long chain α-olefins for paraffins cracking. Modification was made by mineral and organic heteropolyacids for an increasing catalytic activity. The olefins single yield reaches 36,6 % in a flow system at atmospheric pressure, 500–525 °С on the modified zeolites. The specific surface of the zeolite increases from 22 to 257 m2/g in all cases of heteropolyacids modification. The growth of catalytic activity caused by the formation of stable nanostructures in size from 1 to 4 nm, what leads to formation of more stronger Bronsted acid sites. The catalyst is stable at the reaction – regeneration.