SAPO-56分子筛的合成及其催化甲醇制烯烃反应性能  

Synthesis of SAPO-56 Molecular Sieve and Its Catalytic Performance in Methanol-to-Olefins Reaction

作　　者：杜以村 赵昱[2] 刘红星[2] DU Yicun;ZHAO Yu;LIU Hongxing(SINOPEC Catalyst Company Limited Nanjing Division,Nanjing 210000,China;State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,Shanghai Research Institute of Petrochemical Technology,SINOPEC,Shanghai 201208,China)

机构地区：[1]中国石化南京催化剂有限公司,江苏南京210000 [2]中国石油化工股份有限公司上海石油化工研究院,绿色化工与工业催化国家重点实验室,上海201208

出　　处：《化学反应工程与工艺》2020年第5期436-441,共6页Chemical Reaction Engineering and Technology

基　　金：国家重点研发计划项目(2016YFB0701100)。

摘　　要：采用低温-高温两段水热晶化法,并以N,N,N′,N′-四甲基-1,6-己二胺(TMHD)为结构导向剂,合成SAPO-56分子筛。考察了不同硅铝比对分子筛合成的影响,并采用X射线衍射(XRD)、扫描电镜(SEM)、N2吸附-脱附以及NH3程序升温脱附(NH3-TPD)等方法对分子筛的物化性能进行了表征。在固定床反应器中考察了分子筛样品的甲醇转化制低碳烯烃(MTO)催化性能。结果表明:随着硅铝比的增加,样品的形貌发生了较大变化,其中S_(i)O2和Al_(2)O_(3)物质的量之比(S_(i)O2/Al_(2)O_(3))为0.4时,形貌呈现新型夹心式层状结构,同时表面酸性随硅铝比增加而增强;低碳烯烃选择性随着硅铝比的增加先增加后降低,当S_(i)O2/Al_(2)O_(3)为0.4时,具有较高的烯烃选择性。The synthesis of SAPO-56 molecular sieves with different Si contents was carried out by the method of low-high temperature multistep crystallization using N,N,N′,N′-tetramethyl-1,6-hexanediamine(TMHD)as template.The samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),N2 adsorption-desorption,NH3 temperature programmed desorption(NH3-TPD)and evaluated their catalytic performances in the conversion of methanol-to-olefins reaction(MTO).The results indicated that the morphology of the samples changed greatly,especially the sample with the ratio of S_(i)O2/Al_(2)O_(3)0.4 appeared new sandwich layered structure.And the surface acidity increased with the increase of the ratio of S_(i)O2/Al_(2)O_(3).Moreover,the selectivity of olefins increased primarily and then decreased.The highest olefins selectivity was appeared when the ratio of S_(i)O2 to Al_(2)O_(3) was 0.4.

关 键 词：SAPO-56 分子筛 低温-高温分段晶化 AFX 结构 甲醇制烯烃 

分 类 号：TQ426.61[化学工程]