Effect of magnesium on the catalytic properties of polymetallic zeolite catalysts for conversion of dimethyl ether to light olefins

• Published in: Microporous and mesoporous materials 2020-05, Vol.298, p.110087, Article 110087
• Main Authors: Kolesnichenko, N.V., Khivrich, Е.N., Obukhova, T.K., Batova, Т.I., Bondarenko, G.N.
• Format: Article
• Language: English
• Subjects: Dimethyl ether; High-temperature steam treatment of the catalyst; Light olefins; Zeolite catalysts
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2020.110087

The effects of magnesium modification of mono- and bimetallic zeolite catalysts (La-НZSM-5, Zr-НZSM-5, and La–Zr-НZSM-5) and high-temperature steam treatment of these catalysts on the conversion of dimethyl ether to light olefins were studied. The additional introduction of magnesium resulted in higher catalyst activity and selectivity to light olefins. The high-temperature steam treatment of the catalysts not only increased the catalyst activity, but also resulted in higher selectivity to propylene, which is most likely due to higher contribution of the alkene cycle. The developed magnesium-containing zeolite catalysts can be used for the synthesis of light olefins from dimethyl ether with dilution of dimethyl ether in the feed with steam or synthesis gas of different compositions. [Display omitted] •Polymetallic zeolite catalysts were studied in the DME conversion to light olefins.•Additional introduction of magnesium contributes to increased catalyst performance.•The high-temperature steam treatment resulted in higher selectivity to propylene.•Synthesis gas of different compositions can be used for dilution of DME in the feed.