文章摘要
陈伟.蒸汽晶化法制备EMT分子筛及其烯烃净化性能[J].精细化工,2019,36(6):
蒸汽晶化法制备EMT分子筛及其烯烃净化性能
Steam Crystallization of EMT Zeolite and Effect on Olefins Purification Performance
投稿时间:2018-10-12  修订日期:2019-01-18
DOI:
中文关键词: EMT分子筛  蒸汽晶化  烯烃深度净化  极性含氧化合物  功能材料
英文关键词: EMT zeolite  steam crystallization  olefins deeply purification  polar-oxygenated compounds  functional materials
基金项目:上海市科技人才计划项目
作者单位E-mail
陈伟 上海绿强新材料有限公司 charrycechen@sina.cn 
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中文摘要:
      以18-冠醚-6为模板剂,运用蒸汽晶化法制备了六方晶型EMT(八面沸石类似物)分子筛(记为SEMC-2)。在Na2O/Al2O3物质的量比2.4:1.0时,重点考察了蒸汽晶化时间、蒸汽晶化温度对EMT分子筛晶型的影响。结果表明,在晶化温度110℃,晶化时间6 d时,制备得到了直径为3~4 μm,厚度为300~400 nm的六角片状SEMC-2分子筛。与传统的水热晶化制备得到的EMT分子筛(记为HEMC-2)类似,该SEMC-2分子筛能将氮气和乙烯气体中初始摩尔分数为0.02%或0.10%的甲醇、丙醛两种极性含氧化合物杂质深度脱除至摩尔分数0.0001%以下,且穿透时间及吸附容量均没有表现出明显差异。此外,该SEMC-2分子筛具备良好的结构稳定性及较长的使用寿命。原位红外谱图表明,SEMC-2分子筛主要是通过杂质自身氧中的孤电子对与分子筛中的Na+间相互作用的物理吸附过程来脱除甲醇、丙醛两种杂质的
英文摘要:
      In this study, a hexagonal EMT zeolite (denoted as SEMC-2) was successfully fabricated by combination of template 18-crown-6 ether with a steam crystallization (SAC) method. The effects of both SAC time and temperature on the crystal form were emphatically studied at the Na2O/Al2O3 molar ratio of 2.4. The regular hexagonal platelet SEMC-2 zeolite with diameter of 3~4 μm and thickness of 300~400 nm was synthesized under crystallization temperature 110℃, crystallization time 6 days. Similar to EMT zeolite prepared by the traditional hydrothermal crystallization method (denoted as HEMC-2), SEMC-2 zeolite could also deeply purify the trace amounts of polar methanol and propanal to below mole percent 0.0001% from gaseous olefins at an initial mole percent 0.02% or 0.1%. Moreover, the breakthrough times and cumulative adsorption amounts of HEMC-2 and SEMC-2 zeolite had no obvious difference. The regeneration experiment indicated that the SEMC-2 zeolite had more stable structure and longer service life. The in-situ FTIR spectra demonstrated the adsorption processes of the SEMC-2 zeolite for methanol and propanal were a physical adsorption mainly via interaction between the polar-oxygenated compounds O lone-pair eletrons and the SEMC-2 zeolite Na+.
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