Cu_(30)Cr_5/碱性氧化铝催化2,2,6,6-四甲基哌啶酮加氢(英文)

Hydrogenation of 2,2,6,6-Tetramethylpiperidin-4-one over Cu_(30)Cr_5 /Basic Alumina

在2,2,6,6-四甲基哌啶酮连续化加氢生成2,2,6,6-四甲基哌啶醇的反应中,Cu30Cr5/碱性氧化铝比Cu30Cr5/γ-Al2O3具有更优异的催化性能,反应的转化率和选择性分别高达99.0%和97.2%.N2物理吸附-脱附、X射线光电子能谱、X射线衍射和氨气程序升温脱附结果表明,Cu0作为催化加氢反应的活性中心,在Cu30Cr5/碱性氧化铝中具有更好的分散性,且随着碱性氧化铝的引入,催化剂酸性大幅下降,从而有效抑制副产物2,6-二甲基-4-庚酮的生成,因而产物2,2,6,6-四甲基哌啶醇的选择性显著提高.

Alumina B（basic alumina,pH8） 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/γ-Al2O3.99.0% conversion of TAA and 97.2% selectivity for TMP were obtained over Cu30Cr5/alumina B under optimized conditions.Cu30Cr5/γ-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/γ-Al2O3.