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Characterization and reductive amination of cyclohexanol and cyclohexanone over Cu/ZrO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
52375 46872 2008 7 PDF Available
Title
Characterization and reductive amination of cyclohexanol and cyclohexanone over Cu/ZrO2 catalysts
Abstract

Reductive amination of cyclohexanol/cyclohexanone was studied over copper catalysts supported on zirconia. The effect of copper loading and dispersion was studied on the activity and selectivity of the reaction. A series of zirconia supported copper catalysts with varying copper loadings (1–15 wt%) were prepared by incipient wet impregnation method. The catalysts were characterized by X-ray diffraction (XRD) and temperature-programmed reduction (TPR). Copper dispersion and metal area were determined by N2O decomposition by passivation method. X-ray diffraction patterns indicate the presence of crystalline CuO phase from 4.0 wt% Cu on zirconia. TPR patterns reveal the presence of highly dispersed copper oxide at lower temperatures and bulk CuO at higher temperatures. The acid–base properties of catalysts were investigated by means of a model reaction cyclohexanol dehydrogenation to cyclohexanone and compare with the results of TPD of ammonia, which allows to measure the acid–base properties of the support and to investigate the changes in surface acidity or basicity, resulting from the metal impregnation.

Keywords
Copper catalysts, Zirconia; TPR; Dispersion; Reductive amination
First Page Preview
Characterization and reductive amination of cyclohexanol and cyclohexanone over Cu/ZrO2 catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 1, January 2008, Pages 75–81
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis