前处理方法中铝源对ZSM-35分子筛合成的影响  

Effect of Aluminum Source on the Synthesis of ZSM-35 Zeolite in Pretreatment Method

作　　者：任俊杰 黄星亮[1] 王志东 吴晓彤 陈延达 曹磊 REN Junjie;HUANG Xingliang;WANG Zhidong;WU Xiaotong;CHEN Yanda;CAO Lei(College of Chemical Engineering and Environment, China University of Petroleum, Beijing 102249, China)

机构地区：[1]中国石油大学(北京)化学工程与环境学院,北京102249

出　　处：《石油学报（石油加工）》2022年第4期790-799,共10页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(U1662104)资助。

摘　　要：以硅溶胶作为硅源、铝溶胶作为铝源、吡啶作为结构导向剂合成ZSM-35分子筛,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线荧光光谱(XRF)、N_(2)等温吸附-脱附(BET)、氨气程序升温脱附(NH_(3)-TPD)及傅里叶变换红外光谱(FT-IR)等手段进行表征,考察了不同的合成方法(铝源前处理方法、硅源前处理方法及常规水热合成法)和不同铝源(硫酸铝、氢氧化铝、偏铝酸钠和铝溶胶)对ZSM-35分子筛物理性能的影响。结果表明:相比于常规水热合成法,采用前处理方法所制备ZSM-35分子筛的相对结晶度均达到110%以上,固体收率在80%左右,且固相产物具有较高的实际硅/铝摩尔比(简称硅/铝比);铝源前处理法在4种不同铝源上的作用结果差异较大,以铝溶胶为铝源所制备的样品具有高结晶度(157%)、高固体收率(80%)、片层结构均匀(3~5μm)、硅/铝比适中、孔径和比表面积小、酸性适宜等优点;铝溶胶是ZSM-35分子筛合成的最佳铝源。ZSM-35 zeolites were synthesized using silica sol as the silicon source,aluminum sol as the aluminum source and pyridine as the structure-directing agent,and characterized by means of XRD,SEM,XRF,BET,NH_(3)-TPD and FT-IR.Later,the effects of different synthesis methods(aluminum source pretreatment method,silicon source pretreatment method and conventional hydrothermal synthesis method)and different aluminum sources(aluminum sulfate,aluminum hydroxide,sodium aluminate and aluminum sol)on the physical properties of ZSM-35 zeolite were explored.The results show that compared with the conventional hydrothermal synthesis method,the relative crystallinity of ZSM-35 zeolite prepared by pretreatment method can reach above 110%,the solid yield is around 80%,and the solid-phase products have a higher molar ratio of silicon/aluminum(silicon/aluminum ratio for short).The aluminum source pretreatment method has quietly different effects on 4 aluminum sources.The samples prepared using aluminum sol as the aluminum source are characterized by high crystallinity(157%),high solid yield(80%),uniform lamella structure(3—5μm),moderate silicon/aluminum ratio,small pore size and specific surface area and suitable acidity.Therefore,aluminum sol is the best aluminum source for the synthesis of ZSM-35 zeolite.

关 键 词：ZSM-35分子筛 铝源 硅源 聚合形态 前处理方法 结晶度 

分 类 号：TQ426.6[化学工程]