Methanol-to-olefin conversion over ZSM-5: influence of zeolite chemical composition and experimental conditions on propylene formation. Issue 5 (4th May 2022)

• Record Type: Journal Article
• Authors: Sousa, Zilacleide S. B.; Luna, Aderval S.; Zotin, Fátima M. Z.; Henriques, Cristiane A.
• Is Part Of: Chemical engineering communications. Volume 209:Issue 5(2022)
• Page Start: 623
• Page End: 635
• Publication Date: 2022-05-04
• Subjects: Experimental design -- HZSM-5 -- light olefins -- methanol conversion -- propylene -- zeolite; Chemical engineering -- Periodicals; 660.205
• DOI: 10.1080/00986445.2021.1884552
• Languages: English
• ISSNs: 0098-6445

Abstract

Abstract: The transformation of methanol into light olefins over ZSM-5 zeolites with different SiO2 /Al2 O3 molar ratios (SAR) and phosphorus contents was investigated. An increase in the SAR and amount of incorporated phosphorus reduced the acid-site strength and density, which favored catalytic stability and the production of light olefins, mainly propylene. Under an isoconversion of 91%, high propylene/ethylene molar ratios were observed using the zeolite with the highest SAR (i.e., HZ(280)) and the one containing 4 wt.% P (i.e., 4PHZ(30)). However, the latter was less stable when used in a long-term reaction. An experimental design was employed to investigate how the reaction temperature and methanol partial pressure affect the propylene (C3 = ) yield in the reaction catalyzed by the HZ(280) zeolite, which led to a temperature of 475 °C and a methanol partial pressure of 0.04 atm using the proposed model within the experimental design space.