摘要
蒽醌加氢制备H_(2)O_(2)是一个具有重大工业价值的反应。采用分步浸渍法制备了一系列不同AlCl_(3)含量的Pd/xAl-Al_(2)O_(3)催化剂。基于N_(2)吸附脱附、XRD、TEM、NH_(3)-TPD和XPS对催化剂进行表征分析。AlCl_(3)质量分数为1%的Pd/1.0Al-Al_(2)O_(3)催化剂对蒽醌加氢反应具有较高的加氢效率(8.3 g·L^(-1))和选择性(99.5%),明显优于对照Pd/Al_(2)O_(3)催化剂(5.2 g·L^(-1),97.2%)。表征结果表明AlCl_(3)改性的催化剂具有丰富的表面弱酸,为蒽醌分子提供了较多的吸附位点。同时,AlCl_(3)的引入可以改善催化剂的分散度,增加了金属颗粒与载体的相互作用,从而抑制了金属颗粒团聚和流失。
Hydrogenation of anthraquinone to produce H_(2)O_(2)is a great important industrial reaction.Here,a series of Pd/xAl-Al_(2)O_(3)catalysts with different AlCl_(3)contents were prepared by step impregnation method.The catalysts were characterized and analyzed based on XRD,TEM,NH_(3)-TPD,XPS and N_(2)adsorption and desorption.The Pd/1.0Al-Al_(2)O_(3)catalyst with 1%AlCl_(3)content exhibits excellent hydrogenation efficiency of 8.3 g·L^(-1)and selectivity of 99.5%toward anthraquinone hydrogenation,obviously superior to Pd/Al_(2)O_(3)catalyst(5.2 g·L^(-1)and 97.2%).The characterization results show that the catalysts modified by AlCl_(3)have abundant surface weak acids,which provide more adsorption sites for anthraquinone molecules.At the same time,the introduction of AlCl_(3)could improve the dispersion of metal and increase the interaction between the metal particles and the support,which inhibits the agglomeration and loss of metal particles.
作者
袁琴琴
梁靖岳
李韡
张金利
郭翠梨
YUAN Qinqin;LIANG Jingyue;LI Wei;ZHANG Jinli;GUO Cuili(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China)
出处
《化学工业与工程》
CAS
CSCD
北大核心
2023年第6期28-36,共9页
Chemical Industry and Engineering
基金
国家自然科学基金(21776215)。
