摘要
采用水热晶化法高效合成了全结晶的MCM-22分子筛催化剂,利用X射线衍射、扫描/透射电子显微镜、NH3-TPD等手段对催化剂的晶体结构、微观形貌、酸性质等进行了综合表征,并考察了催化剂在苯和乙烯液相烷基化制乙苯反应中的催化性能。结果表明,该全结晶MCM-22分子筛催化剂在160℃条件下40h即可完成晶化,相对结晶度达到100%。制得的分子筛为薄片层状结构,由100%活性组分组成。晶化后的催化剂成品仍维持条状形貌,机械强度达到82N/cm,满足工业应用需求。将该全结晶MCM-22分子筛催化剂应用于液相烷基化反应时,在反应温度180℃、反应压力3.5MPa、乙烯质量空速1h-1、苯与乙烯摩尔比为2.5的条件下运行1000h,催化剂表现出良好的反应活性、选择性和稳定性,乙烯转化率接近100%,乙基选择性约99.84%,重组分含量始终维持在1000μL/L左右。
Fully crystalline MCM-22 zeolite catalyst was efficiently synthesized by hydrothermal crystallization method.The crystal structure,micro morphology,and acid property of the as-prepared catalyst were characterized by X-ray diffraction,scanning/transmission electron microscopy(SEM and TEM),NH3-TPD,and so on.The catalytic performance of the as-prepared catalyst in the liquid-phase alkylation of benzene and ethylene to ethylbenzene was investigated.The results showed that the relative crystallinity of MCM-22 zeolite with ultra-thin layered structure reached 100%after 40h crystallization at 160℃.In addition,the morphology of the catalyst after crystallization remained in strip shape with 100%active component,and the mechanical strength of the catalyst was as high as 82N/cm,which fully met the requirement of industrial application.Under reaction conditions close to industrial process:temperature of 180℃,pressure of 3.5MPa,ethylene weight hourly space velocity(WHSV)of 1h-1,molar ratio of benzene to ethylene of 2.5,the as-prepared fully crystallized MCM-22 zeolite catalyst showed good catalytic activity,selectivity,and stability.The ethylene conversion and the ethyl selectivity of the catalyst were close to 100%and 99.84%,respectively,and the content of heavy components remained about 1000μL/L within 1000h.
作者
王一棪
王达锐
沈震浩
何俊琳
孙洪敏
杨为民
WANG Yiyan;WANG Darui;SHEN Zhenhao;HE Junlin;SUN Hongmin;YANG Weimin(State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,Sinopec Shanghai Research Institute of Petrochemical Technology Co.,Ltd.,Shanghai 201208,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2024年第1期285-291,共7页
Chemical Industry and Engineering Progress
基金
材料基因工程关键技术与支撑平台专项项目(2017YFB0702800)
上海市科研计划专项项目(22YS1401100)。
关键词
水热
结晶
分子筛
催化剂
苯
hydrothermal
crystallization
zeolite
catalyst
benzene
作者简介
第一作者:王一棪(1992—),女,博士,研究方向为工业催化。E-mail:wangyiyan.sshy@sinopec.com。;通信作者:杨为民,正高级工程师,中国工程院院士,研究方向为工业催化。E-mail:yangwm.sshy@sinopec.com。
