The Characterization of Modified Higher Aliphatic Alcohols-Synthesis Catalysts by EPR and XPS Methods

摘要

A series of copper-zinc catalysts for aliphatic alcohols synthesis with a varying amount of additives was prepared by thermal decomposition of metal citrates.The results of catalytic experiments,made in a laboratory high-pressure reactor,showed a good stability and almost constant activity and selectivity during 4 months.In this paper the catalyst before (A) and after (B) reaction is characterized by EPR and X-ray photoelectron spectroscopies.For catalyst A the copper species were identified as isolated Cu~(2+) ions in a dynamic Jahn-Teller configuration.For the sample B the EPR spectrum is complex and its features are corresponding to: clustered Cu~(2+) species with dipole-dipole interaction; Fe~(3+) ions in rhombically distorted symmetry; O_2~- centres.