Key factor affecting the structural and textural properties of ZSM-5/MCM-41 composite
Key factor affecting the structural and textural properties of ZSM-5/MCM-41 composite
复制标题
DOI：
10.1016/j.jpcs.2014.11.006
复制
发表时间：
2015-03
影响因子：
4
通讯作者：
Bouhadjar Boukoussa;N. Aouad;R. Hamacha;A. Bengueddach
中科院分区：
文献类型：
--
作者：
Bouhadjar Boukoussa;N. Aouad;R. Hamacha;A. Bengueddach
以经碱处理的ZSM-5沸石为原料，以二氧化硅和铝为原料，采用水热法合成了ZSM-5/MCM-41微介孔复合材料，并采用x射线衍射（XRD）、77 K氮气吸附、透射电镜（TEM）、红外光谱（FTIR）和nh3程序升温脱附（TPD）等多种物化技术对其进行了表征。研究了CTAB的浓度对这些固体合成的影响，随着CTAB浓度的增加，介孔体积、比表面积和表面酸度降低。增加CTAB浓度会引起ZSM-5分子筛的再结晶，不利于MCM-41介孔材料的形成。研究了ZSM-5/MCM-41材料在苯甲酰氯为烷基化剂的苯甲酰甲酰化反应中的催化活性。结果表明，反应受比表面积、孔体积和表面酸度的影响。
ZSM-5/MCM-41 micro/mesoporous composite materials were synthesized by the hydrothermal technique with alkali-treated ZSM-5 zeolite as source of silica and aluminum and characterized by various physico-chemical techniques such as X-ray diffraction (XRD), nitrogen sorption at 77 K, transmission electronic microscopy (TEM), FTIR spectroscopy and NH3temperature programmed desorption (TPD) techniques. The effect of concentration of CTAB in the synthesis of these solids has been investigated, the mesopore volume, surface area and surface acidity decrease with increasing the concentration of CTAB. Increasing the CTAB concentration causes the recrystallization of zeolite ZSM-5 and it disadvantage the formation of mesoporous materials MCM-41. The catalytic activity of ZSM-5/MCM-41 materials has been evaluated in the Friedel–Crafts acylation of anisole with benzoyl chloride as alkylating agent. The results revealed the reaction to be influenced by surface area, pore volume and surface acidity.