Determination of the Effects of Different Acids on HZSM-5 for MTO Reaction

5TH INTERNATIONAL CONFERENCE ON ENGINEERING AND APPLIED NATURAL SCIENCES ICEANS 2024, Konya, Türkiye, 25 - 26 Ağustos 2024, ss.212, (Özet Bildiri)

Determination of the Effects of Different Acids on HZSM-5 for MTO

Reaction

Pınar Değirmencioğlu*1 , Hüseyin Arbağ 2

1,2

Departmentof Chemical Engineering, Gazi University, Turkey

(pinardegirmencioglu@gazi.edu.tr)

Abstract – Olefins are unsaturated hydrocarbons containing at least one C=C bond. Generally, ethylene

and propylene are considered as light olefins. Although light olefins, which are important building blocks

of modern chemistry, are obtained through the thermal and catalytic cracking of petroleum products, the

depletion of petroleum resources has necessitated alternative production methods. Therefore, the

conversion of methanol derived from bio-waste to olefins (MTO) has become an important option. In this

study, it is aimed to investigate the dealuminating effect of different acids on commercial HZSM-5 to be

used for MTO reaction for obtaining light olefins at a high selectivity.develop innovative catalysts that

are stable under reaction conditions and show high total light olefin selectivity for use in the MTO

reaction. Activity tests were conducted in a continuous flow fixed bed reaction system in the presence of

0.1 g catalyst pellets at 450°C and 1 atm. SEM-EDX, ICP-OES, and DRIFTS analysis showed that HCl,

H3PO4, and H2SO4 treatment affected the Si/Al ratio and acidity of the HZSM -5 catalyst. The highest

total light olefin selectivity was obtained as 53% from the H3PO4-treated HZSM-5 catalyst. During the

long-term activity tests of catalysts, phosphoric acid treatment enhanced the stability of the catalyst and

increased the amount of the total olefin selectivity of the parent HZSM-5 by 33%.

Keywords –Methanol, Olefins, HZSM-5, H3PO4, H2SO4, HCl