CONVERSION OF BIOETHANOL INTO HYDROCARBONS IN THE PRESENCE OF Ni- AND Co-CONTAINING ZSM-5 ZEOLITES

Abstract

The influence of ZSM-5 type zeolite modification with nickel and cobalt on its catalytic properties in the conversion of bioethanol into high-octane isoparaffinic and aromatic hydrocarbons has been studied in the temperature range of 300-450 °C in a flowing unit. It is shown that unmodified ZSM-5 has low isomerisation, high cracking and aromatising activity. Modification of zeolite ZSM-5 with cobalt in the amount of 2.0 wt.% reduces its cracking and aromatising activity and increases its isomerising activity. The highest isomerising activity is achieved in the temperature range of 300-350 °C. The yield of C5-C14 isoalkanes increases from 9.2 10.9 wt.% to 22.4-23.0 wt.%. Modification of the catalyst 2% Co/NZSM-5 with nickel in the amount of 1.0 wt.% improves its isomerising activity. At 300 °C the yield of C5-C14 isoalkanes increases up to 25.8 wt.%. It is established that double modification of zeolite HZSM-5 with nickel and cobalt allows to obtain high-octane components of motor fuels enriched with isoparaffin hydrocarbons. The petrol fraction obtained in the presence of bimetallic catalyst 1% Ni 2%Co/HZSM-5 by the content of isoparaffinic (43.0 wt.%), aromatic (19.1 wt.%), alkenic hydrocarbons (0.9 wt.%) and benzene (0.6 wt.%) has octane number 101 and complies with Euro-5 motor fuel standard.