Potential use of Co-supported catalysts as a tire pyrolysis catalyst for production of valuable petrochemicals

Abstract

According to the increasing mono-aromatics consumption and the increasing price of oil, the aromatic prices increase. The catalytic waste tires pyrolysis is one ofthe alternative techniques, which has potential to convert the waste to valuable aromatic products. In this work, the advantages of bifunctional catalysts are taken to improve the quality of tire pyrolysis products, expecially on mono-aromatics production by using 5% of cobalt supported on different zeolites, namely HY, HBETA, HMOR, HZSM-5 and SAPO-34. Moreover, 5% cobaltsupported binary support catalysts, namely HY/SAPO-34, HBETA/SAPO-34, and HMOR/SAPO-34 were studied. It is well known that HY, HBETA, HMOR and HZSM-5 have the advantages in isomerization and aromatizarion, whereas SAPO-34 has the advantage in cracking large molecules due to its pores. Therefore, combining SAPO-34 with HY, HBETA, HMOR, and HZSM-5 can be considered beneficial for thecatalytic pyrolysis of waste tire. It was found that 5%Co loaded on all supports increased gas yields and the concentration of mono-aromatics in oil products as compared to those of the pure zeolite and non-catalytic cases. Moreover, 5%Co/HY catalyst gave the highes production of light olefins, whereas 5%Co/HZSM-5 gave the highest production of cooking gas. Among the catalysts supported with acid zeolites, 5%Co/HZSM-5 catalyst was found to give the highest mono-aromatics production in the pyrolytic oil. Furthermore, the binary support catalyst, 5%Co(HMOR+SAPO-34) gave the highest mono-aromatics production among all catalysts.