CATALYTIC CRACKING OF NAPHTHA OVER NOVEL ZEOLITES FOR MAXIMIZING LIGHT OLEFINS YIELD

Abstract

Abstract: Catalytic cracking of naphtha（NCC） was carried out in a fixed bed micro-activity test unit. A series of zeolites with different pore structures was investigated，namely HZSM-5，HIM-5，HEU-1 and HAl-ITQ-13. The structural and acidic properties of these zeolites were characterized by XRD，SEM，N2 adsorption-desorption and Py-IR. The results showed that HAl-ITQ-13，HEU-1 and HIM-5 increased the naphtha conversion compared to HZSM-5. The light olefins（ethylene＋propylene＋butylene） yield of HAl-ITQ-13 and HEU-1 increased 13.3 and 8.6 percentage points respectively，compared with HZSM-5. High catalytic activities of HAl-ITQ-13 and HEU-1 were ascribed to smaller pore size and lower concentration of acid sites. HIM-5 can not stimulate the production of light olefins with the light olefins yield lower than HZSM-5 by 3.5 percentage points. Additionally，the reactivity of propylene under NCC reaction conditions was investigated. It was found that propylene was an active product under NCC reaction conditions. The main products of propylene catalytic transformation included ethylene，propane，butylene. The suppression of hydrogen transfer reactions was critical for maximizing light olefins yield. When developing NCC new materials，the structural and acidic properties of zeolites should be considered thoroughly due to their great effects on the secondary reactions.

Key words: ZSM-5, IM-5, EU-1, Al-ITQ-13, catalytic cracking, light olefins

CLC Number:

Wu Yufan Wang Lixia Tian Huiping Chen Junwen. CATALYTIC CRACKING OF NAPHTHA OVER NOVEL ZEOLITES FOR MAXIMIZING LIGHT OLEFINS YIELD[J]. Petroleum Processing and Petrochemicals, 2019, 50(10): 31-37.

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