The role of acidity, side pocket, and steam on maximizing propylene yield from light naphtha cracking over one-dimensional zeolites: Case studies of EU-1 and disordered ZSM-48

• Published in: Fuel (Guildford) 2019-12, Vol.258, p.116034, Article 116034
• Main Authors: Ahmed, Mohamed H.M., Masuda, Takao, Muraza, Oki
• Format: Article
• Language: English
• Subjects: Acidity; Aluminum; Catalysts; Catalytic cracking; Deactivation; EU-1; Fixed bed reactors; Fixed beds; Naphtha; Naphtha cracking; One-dimensional zeolites; Propylene; Silicon; Steam; Steam cracking; Yield; Zeolites; ZSM-48
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2019.116034

[Display omitted] •ZSM-48 and EU-1 with different Si/Al ratios were applied in catalytic cracking.•The highest propylene yield was ~39 wt% over EU-1 with Si/Al of 50.•The side pocket of EU-1 enhanced the catalyst lifetime and propylene yield.•The addition of 5% steam changed the concentration of Brønsted and Lewis acid sites.•The presence of steam over ZSM-48 enhanced the catalyst lifetime. Catalytic cracking of light naphtha was carried out in a fixed bed reactor over ZSM-48 and EU-1 zeolites at different Si/Al ratios. The highest propylene yield achieved was ~39 wt% over EU-1 catalyst which has the lowest Si/Al ratio of 50. The side pocket of EU-1 catalyst exhibited important role in prolonging the lifetime and enhancing the propylene yield. The addition of 5% molar percent of water to the reaction caused considerable changes in the concentration of Brønsted and Lewis due to the dealumination observed. The presence of steam over ZSM-48 showed good enhancement in the catalyst lifetime and significant decrease in deactivation rate as compared to EU-1.