RUB-13分子筛的合成及其甲醇制烯烃催化性能  

Synthesis of RUB-13 zeolite and its catalytic performance in the conversion of methanol to olefins

作　　者：张莉 孟鹏通 王森[1] 秦张峰[1] 王鹏飞 王国富[1] 李俊汾[1] 董梅[1] 樊卫斌[1] 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)

机构地区：[1]中国科学院山西煤炭化学研究所,煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100049

出　　处：《燃料化学学报》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。

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.

关 键 词：RUB-13分子筛 水热合成 甲醇制烯烃 催化性能 

分 类 号：O643.3[理学—物理化学]