Cu/SBA-16催化剂及其催化苯酚羟基化性能

为研究介孔催化剂的催化性能,采用pH调节浸渍法合成了具有三维介孔结构的Cu/SBA-16催化剂,并借助催化活性测试、X射线衍射（XRD）、透射电镜（TEM）、原子吸收光谱（AAS）、N_2吸附-脱附和氢气程序升温还原（H_2-TPR）方法分析了pH和Cu负载量对其催化苯酚羟基化性能的影响。结果表明：在pH=7.0条件下制备的Cu/SBA-16催化剂（w（Cu）=7.2%）表现出较好的苯酚羟基化活性;引入Cu物种后的催化剂较好地保持了SBA-16分子筛的三维笼状孔道结构;当Cu质量分数低于16.3%时,Cu物种主要以高分散的CuO形式存在于Cu/SBA-16的孔道内,该CuO物种在苯酚羟基化反应中起关键作用。该研究为进一步探讨Cu/SBA-16催化剂结构与反应性能间的联系奠定了基础。

Synthesis of Cu/SBA-16 catalysts and their catalytic performance for hydroxylation of phenol

Aimed at studying the catalytic activity of the mesoporous catalysts,this paper introduces the preparation of mesoporous Cu/SBA - 16 catalysts with 3-D pore structure by modified impregnation method with pH adjustment and the investigation into the effects of pH and Cu loading on catalytic activity of phenol hydroxylation by catalytic activity test,XRD,TEM,AAS,N_2 adsorption-desorption and H_2- TPR.The results show that the Cu/SBA - 16（w（Cu） =7.2%） catalyst synthesized at pH value of 7.0 exhibits better catalytic performance for phenol hydroxylation.The cubic cage-like pore structure of SBA - 16 was well maintained after introduction of Cu species.With Cu of less than 16.3%,Cu species occur mainly in the form of highly dispersed CuO in the pores of the Cu/SBA - 16 catalysts,and these CuO species play a key role in hydroxylation of phenol.This study provides a basis for the further investigation into the relationship of structure and catalytic properties for the Cu/SBA - 16 catalysts.