Dimethyl Ether Carbonylation on H-MOR Zeolite, Modified Cu, Co, Mg

M. A. Kipnis; Кипнис М. А.; R. S. Galkin; Галкин Р. С.; E. A. Volnina; Волнина Э. А.; I. A. Belostotskii; Белостоцкий И. А.; G. N. Bondarenko; Бондаренко Г. Н.; O. V. Arapova; Арапова О. В.

doi:10.31857/S0453881123060084

Dimethyl Ether Carbonylation on H-MOR Zeolite, Modified Cu, Co, Mg

Authors: Kipnis M.A.¹, Galkin R.S.¹, Volnina E.A.¹, Belostotskii .A.¹, Bondarenko G.N.¹, Arapova O.V.¹
Affiliations:
1. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences
Issue: Vol 64, No 6 (2023)
Pages: 798-810
Section: ARTICLES
URL: https://journal-vniispk.ru/0453-8811/article/view/231839
DOI: https://doi.org/10.31857/S0453881123060084
EDN: https://elibrary.ru/KUAWXB
ID: 231839

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Abstract

Mordenite and ferrierite (Zeolyst International, H-form, SiO₂/Al₂O₃ ≈ 20) were used to study the adsorption, thermally programmed desorption, and carbonylation of dimethyl ether (DME). The behavior of mordenite with Cu, Co, and Mg cations introduced by ion exchange has also been studied. DME carbonylation was carried out at 200°C, pressure 3 MPa, space velocity 8000 ml g^–1 h^–1 in a mixture, vol. %: ⁓2.2 DME, 92.8–95.5 CO, rest. N₂. After the induction period, the methyl acetate content is about 4–5 times higher for mordenite compared to ferrierite. The formation of water, methanol and hydrocarbons was observed in small quantities. The introduction of Cu, Co, Mg cations into mordenite by ion exchange (single ion exchange, cation/Al ratio no more than 35%) not only increased the stability, but also increased the activity in the DME carbonylation reaction. It was found that an increase in the content of copper (from 1.19 to 2.23 wt %) and Mg (from 0.62 to 1.8 wt %) differently affects the activity. In the case of copper, an increase in activity was observed, while in the case of magnesium, the activity decreased. Preliminary reduction of copper-exchange mordenite leads to a decrease in activity and the appearance of metallic copper particles on the surface of mordenite crystallites. According to in situ diffuse reflectance infrared spectroscopy, the introduction of magnesium cations by triple ion exchange leads to a noticeable decrease in the number of Brønsted acid sites (BACs) in both the 12-MR and 8-MR channels of mordenite. The catalytic characteristics of ferrierite practically do not change when copper and magnesium are introduced by ion exchange.

Keywords

dimethyl ether, carbonylation, methyl acetate, mordenite, ferrierite

References

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