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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.
In the reaction of continuous hydrogenation of 2,2,6,6-tetramethylpiperidone to 2,2,6,6-tetramethylpiperidinol, the Cu30Cr5 / basic alumina ratio Cu30Cr5 / γ-Al2O3 With more excellent catalytic performance, the conversion rate and selectivity of the reaction were as high as 99.0% and 97.2%, respectively.The results of N2 physical adsorption-desorption, X-ray photoelectron spectroscopy, X-ray diffraction and ammonia temperature programmed desorption showed that Cu0 Catalytic hydrogenation activity of the active center in Cu30Cr5 / alkaline alumina has better dispersibility, and with the introduction of basic alumina, the catalyst acidity dropped significantly to effectively inhibit by-products 2,6 - dimethyl -4-heptanone, the selectivity of the product 2,2,6,6-tetramethylpiperidinol is significantly increased.