Highly Selective Amination of o- and p-Alkyl Phenols over Pd/Al<sub>2</sub>O<sub>3</sub>-BaO
作者:Jianchao Ma、Huabang Wang、Meng Sun、Fan Yang、Zhiwei Wu、Donghua Wang、Ligong Chen
DOI:10.5012/bkcs.2012.33.2.387
日期:2012.2.20
A series of Pd-based catalysts were prepared and examined for the amination of 2,6-dimethylphenol in a fixedbed reactor. The best results were obtained for Pd/$Al_2O_3$-BaO with a conversion of 99.89% and a selectivity of 91.16%. These catalysts were characterized using BET, XRD, XPS, TEM and $NH_3$-TPD. Doped BaO not only improved the dispersion of the Pd particles but also decreased the acidity of the catalyst, which remarkably enhanced the selectivity and stability of the catalyst. The generality of Pd/$Al_2O_3$-BaO for this kind of reaction was demonstrated by catalytic aminations of o- and p-alkyl phenols.
一系列基于钯的催化剂被制备并用于在固定床反应器中进行2,6-二甲基苯酚的胺化反应。其中,Pd/Al2O3-BaO催化剂表现出最佳性能,转化率达到99.89%,选择性为91.16%。这些催化剂通过BET、XRD、XPS、TEM和NH3-TPD进行了表征。掺杂的BaO不仅提高了钯粒子的分散性,还降低了催化剂的酸度,显著提高了催化剂的选择性和稳定性。Pd/Al2O3-BaO催化剂对于邻位和对位烷基苯酚的催化胺化反应展示了其普遍适用性。