Abstract
The in situ formation of a catalytic heterohomogeneous system containing Al–M alloy (M is Ni, Co, Cu) and Al(M)/Cl complex in a benzene–ethylene medium at a temperature of 80°C and a pressure of 0.2–0.3 MPa is studied. The characteristic patterns of interaction between Al–M alloys activated with a liquid metal Ga–In eutectic and a chlorinating agent (CCl4) with the formation of catalytically active metal–aluminum chloride Al(M)/Cl complexes are established. Results from spectrokinetic measurements show the order of the reactivity of activated alloys with respect to excess CCl4 is Al–Cu ≈ Al–Ni > Al > Al–Co. The highest catalytic activity is displayed by nickel–aluminum chloride complexes whose selectivity toward ethylbenzene is 48%. Data from IR and UV-VIS spectroscopy show that the structure and composition of metal chloride complexes formed in situ in the aromatic reaction medium is determined by a combination of coupled ionic pairs \([{\text{AlC}}{{{\text{l}}}_{4}}]_{{{\text{tetr}}}}^{ - }{\text{/[NiC}}{{{\text{l}}}_{{\text{6}}}}]_{{{\text{oct}}}}^{{4-}}\) and \(\left[ {{\text{AlC}}{{{\text{l}}}_{{\text{4}}}}} \right]_{{{\text{tetr}}}}^{ - }/\left[ {{\text{CuC}}{{{\text{l}}}_{{\text{2}}}}} \right]_{{{\text{lin}}}}^{ - }\), which are stabilized by (C6H5)3C+ carbocation.
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ACKNOWLEDGMENTS
The authors are grateful to engineer S.N. Evdokimov and chief engineer E.N. Kudrya for participating in our NMR and GC/MS studies.
Funding
This work was supported by the RF Ministry of Science and Higher Education as part of a state taks to the Boreskov Institute of Catalysis, project no. AAAA-A21-121011890074-4.
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Arbuzov, A.B., Drozdov, V.A., Lavrenov, A.V. et al. Creating a Heterohomogeneous Catalytic System for the Alkylation of Benzene with Ethylene through the Reaction beteen Carbon Tetrachloride and Aluminum Alloys. Catal. Ind. 14, 363–368 (2022). https://doi.org/10.1134/S207005042204002X
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DOI: https://doi.org/10.1134/S207005042204002X