Hydrogenation of 2,2,6,6-Tetramethylpiperidin-4-one over Cu30Cr5/Basic Alumina
文摘
Alumina B (basic alumina, pH > 8) was used as the support of copper-chromium catalysts for continuous hydrogenation of 2,2,6,6-tetramethylpiperidin-4-one (TAA) to 2,2,6,6-tetramethylpiperidin-4-ol (TMP). It was found that Cu30Cr5/alumina B exhibited better catalytic performance than Cu30Cr5/¦Ã-Al2O3. 99.0 % conversion of TAA and 97.2 % selectivity for TMP were obtained over Cu30Cr5/alumina B under optimized conditions. Cu30Cr5/¦Ã-Al2O3 and Cu30Cr5/alumina B were characterized by N2 adsorption-desorption, X-ray diffraction, X-ray photoelectron spectroscopy, and NH3 temperature-programmed desorption. The results showed that Cu particles dispersed better in Cu30Cr5/alumina B than in Cu30Cr5/¦Ã-Al2O3.