Deactivation resistance of ZSM-5-type zeolites containing alkaline earth metals used for methanol conversion

• Published in: Applied catalysis Vol. 41; no. 1-2; pp. 121 - 135
• Main Authors: Okado, Hideo, Shoji, Hiroshi, Sano, Tsuneji, Ikai, Shigeru, Hagiwara, Hiroyuki, Takaya, Haruo
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.1988; Elsevier
• Subjects: Catalysis; Catalysts: preparations and properties; Catalytic reactions; Chemistry; Exact sciences and technology; General and physical chemistry; General. Nomenclature, chemical documentation, computer chemistry; Theory of reactions, general kinetics; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Catalyst regeneration; Fourier transformation; Deactivation; Aliphatic compound; Coke; Acidic site; Saturated compound; X ray spectrometry; Zeolite; Molecular sieve; Primary alcohol; Catalytic conversion; Infrared spectrometry; X ray fluorescence spectrometry; FTIR Spectrometry; Catalyst; Comparative study
• ISSN: 0166-9834
• DOI: 10.1016/S0166-9834(00)80387-5

ZSM-5 and its alkaline earth forms were used for methanol conversion at 600°C where unmodified ZSM-5 rapidly cokes. Of the alkaline earth forms, the calcium and strontium forms are much more coke resistant providing a long on-stream life for methanol conversion. Coke burning regeneration of the calcium form after one cycle results in some migration of calcium to the external surface of the zeolite which lowers the coke resistance. These findings are attributed to the effect of the alkaline earth on the acidity of the zeolite.