ESR Detection of Copper Ion Clusters
in the CuZnAl Oxide Catalysts for Methanol Synthesis

A. A. Altynnikov*, V. F. Anufrienko*, A. Ya. Rozovskii**, G. I. Lin**,
E. V. Lunina***, and V. A. Sadykov*

* Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090 Russia
** Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, 117912 Russia
*** Moscow State University, Moscow, 119899 Russia

Received December 30, 1997

Abstract—It was found by ESR spectroscopy that the treatment of the Cu–Zn–Al oxide catalysts for methanol
synthesis with pyridine did not produce isolated pyridinate complexes. In this case, three types of copper clus-
ters were formed; two of them were assigned to the ordered Jahn–Teller clusters. It was suggested that the clus-
ter structures consist of the Cu²⁺–O–M–O–Cu²⁺ oxide fragments (where M is the Al³⁺, Zn²⁺, and Cu²⁺ ion),
which were not decomposed upon treatment with pyridine.

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