Detailed experimental study of the mechanism of catalytic reactions at molecular level is always of crucial importance for both theoretical understanding and applied catalysis. It was considered important to define the nature of the structural changes under working conditions, since these changes are almost certainly related to the final Detailed experimental study of the mechanism of catalytic reactions at molecular level is always of crucial importance for both theoretical understanding and applied catalysis. It was considered important to define the nature of the structural changes under working conditions, since these changes are almost certainly related to the final