摘要
添加双模板剂三乙胺和四乙基溴化铵,利用水热法合成片状SAPO-34作为晶种,改变模板剂组成合成不同厚度的层状SAPO-34分子筛。采用X射线衍射、扫描电子显微镜、氨气程序升温脱附等手段对合成的分子筛进行表征,在固定床反应器上评价SAPO-34的甲醇制烯烃催化性能。实验结果表明:添加晶种使SAPO-34分子筛的晶化时间缩短了36 h,无模板剂导向作用无法合成SAPO-34,利用模板剂组成可以调变层状SAPO-34分子筛的厚度;板层状SAPO-34比片层状和立方体状分子筛的低碳烯烃选择性略高,但其稳定性较片层的SAPO-34稍差。
The flake structure SAPO-34 was firstly synthesized via a hydrothermal method with co-template triethylamine and tetraethylammonium bromide as crystal seeds,and then the layered SAPO-34 molecular sieves with different thicknesses were synthesized via changing the template composition.The prepared samples were characterized by X-ray diffraction,scanning electronic microscopy and NH3-temperature programmed desorption.The methanol to olefins catalytic performance of the SAPO-34 was evaluated by a fixed-bed reactor.The results show that the crystallization time of SAPO-34 shortens by to 36 h and the SAPO-34 cannot be produced without template.The template has an influence on the thickness of layered SAPO-34.The lamellar SAPO-34 has better light olefins selectivity than the flake and cubic ones,but its catalytic stability is slightly inferior to that of the flake one.
作者
王钰佳
李璐
白英芝
魏民
王海彦
WANG Yujia;LI Lu;BAI Yingzhi;WEI Min;WANG Haiyan(Liaoning Shihua University,Fushun 113001,Liaoning,China;China University of Petroleum(East China),Qingdao 266555,Shandong,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2020年第7期1128-1133,共6页
Journal of The Chinese Ceramic Society
基金
辽宁省教育厅科研项目(L2017LQN008)
国家自然科学基金项目(2016-Z0030)。
