摘要
采用水热法合成RUB-13分子筛,探讨了有机模板剂(OSDA)、硅源、晶化温度和水硅比等制备条件对RUB-13分子筛晶体结构的影响,考察了RUB-13分子筛在甲醇制烯烃(MTO)反应中的催化性能。结果表明,采用1,2,2,6,6-五甲基哌啶(PMP)为有机模板剂、白炭黑为硅源,在晶化温度为170℃的条件下,选择H2O/Si比为100和80时可分别合成出高纯度的低硅铝比(Si/Al=100)和高硅铝比(Si/Al=200)的RUB-13分子筛晶体,且晶粒呈棒状形貌。H-Al-B-RUB-13(Si/Al=200)分子筛用于催化甲醇制烯烃反应时,在400℃下表现出高的低碳烯烃选择性(C=2-5选择性达97.8%,丙烯选择性为54.5%),优于传统的H-SAPO-34和H-ZSM-5分子筛催化剂。
RUB-13 zeolites were synthesized by hydrothermal method.The effect of organic structure-directing agent(OSDA),silica source,crystallization temperature and Si/H20 ratio on the crystal structure was investigated and the catalytic performance of H-RUB-13 in the conversion of methanol to olefins(MTO) was evaluated.The results indicate that with 1,2, 2,6,6-pentamethylpiperidine(PMP) as OSDA and fumed silica as silica source,pure and highly crystalline RUB-13 zeolites with a Si/Al ratio of 100 or 200 can be successfully synthesized by crystallization at 170℃,with a H2 O/Si ratio of 100 or 80 in the synthesis gel,respectively.The crystals of the synthesized RUB-13 zeolites display a thin rod-like morphology.As a catalyst in MTO,the highsilica H-Al-B-RUB-13(Si/Al=200) zeolite exhibits unprecedentedly high selectivity to light olefins at 400℃(54.5% to propene and 97.8% to C2-5=),much better than the traditional H-SAPO-34 and H-ZSM-5 zeolites under similar conditions.
作者
张莉
孟鹏通
王森
秦张峰
王鹏飞
王国富
李俊汾
董梅
樊卫斌
王建国
ZHANG Li;MENG Peng-tong;WANG Sen;QIN Zhang-feng;WANG Peng-fei;WANG Guo-fu;LI Jun-fen;DONG Mei;FAN Wei-bin;WANG Jian-guo(State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2020年第9期1097-1104,I0006,共9页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(21991092,U1910203,U1862101,21773281,21802157)
中国科学院先导科技专项(XDA21020500)
山西省自然科学基金(201901D211581)资助。
关键词
RUB-13分子筛
水热合成
甲醇制烯烃
催化性能
RUB-13 zeolite
hydrothermal synthesis
methanol to olefins(MTO)
catalytic performance
作者简介
Corresponding author:秦张峰.E-mail:qzhf@sxicc.ac.cn(QIN Zhang-feng);Corresponding author:李俊汾.E-mail:lijunfen@sxicc.ac.cn(LI Jun-fen);Corresponding author:王建国.E-mail:iccjgw@sxicc.ac.cn(WANG Jian-guo).
