摘要
以粗孔硅胶与偏铝酸钠为原料,采用常规水热晶化法合成出ZSM-5分子筛,对其在不同温度下进行汽蒸处理。采用XRD、NH_3-TPD、N_2物理吸附等方法对其结构和酸性进行了表征,结果表明,汽蒸处理未改变分子筛的晶相,使ZSM-5分子筛酸中心数量减少,酸强度减弱,介孔比表面积和介孔孔容增大,孔分布改变。
ZSM-5 zeolites were synthesized by conventional hydrothermal method,using porous silica and sodium aluminate as raw materials,and both pore structure and acidity of the zeolites before and after steam treatment at different temperatures were characterized through XRD,NH3-TPD and N2 physical adsorption. The results showed that the steam treatment could result in acid sites number and acidity reduction,specific surface area and volume of mesopores increase,pore distribution variation,while samples pore structure keep intact.
作者
于岩飞
安良成
YU Yan-fei;AN Liang-cheng(R＆D Center of Coal to Liquid and Chemical, Shenhua Ningxia Coal Group Co. Ltd., Yinchuan 750411, Ningxia, China)
出处
《合成材料老化与应用》
2018年第1期80-84,共5页
Synthetic Materials Aging and Application
基金
神华集团科技创新项目(SHJT-17-07)
关键词
ZSM-5分子筛
汽蒸
孔结构
酸性
ZSM - 5 zeolites, steam treatment, pore structure, acid property
