SAPO-18分子筛的快速合成及其甲醇制烯烃性能  

Rapid synthesis of SAPO-18 molecular sieve and its MTO performance

作　　者：张岩 李渊[1] 赵立国 谭小耀[1] 覃环 王秋月 黄从付 ZHANG Yan;LI Yuan;ZHAO Liguo;TAN Xiaoyao;QIN Huan;WANG Qiuyue;HUANG Congfu(School of Environmental and Chemical Engineering of Tianjin Polytechnic University,Tianjin 300387,China;Tangshan Natural Gas Company Limited,Tangshan 063000,Hebei,China)

机构地区：[1]天津工业大学环境与化学工程学院,天津300387 [2]唐山市天然气有限公司,河北唐山063000

出　　处：《化工进展》2018年第5期1815-1822,共8页Chemical Industry and Engineering Progress

基　　金：天津市科技特派员项目(14JCTPJC00559)

摘　　要：在水热合成SAPO-18分子筛的过程中,通过在合成凝胶中加入过硫酸钾来加速SAPO-18分子筛的结晶。借助ESR、XRD、SEM、FTIR和NH_3-TPD对分子筛的结晶过程和所制备的分子筛样品进行表征,并通过固定床反应器评价所制备的SAPO-18样品对甲醇转化制备低碳烯烃(MTO)反应的催化性能。考察了加入过硫酸钾的量对SAPO-18分子筛样品及其MTO催化性能的影响。实验结果表明,合成凝胶中适量过硫酸钾的加入,使得体系中羟基自由基(·OH)数量增多,SAPO-18分子筛的结晶度提高,形貌变好。此外,通过评价SAPO-18分子筛催化MTO过程发现,合成凝胶中加入过硫酸钾后寿命显著增长。In the hydrothermal synthesis of SAPO-18 molecular sieves,the crystallization of SAPO-18 molecular sieves could be accelerated by the addition of potassium persulfate in the synthetic gel.The properties of the molecular sieve samples were characterized by ESR,XRD,SEM,FTIR and NH3-TPD,and the catalytic performance of the prepared SAPO-18 for the conversion of methanol to olefins were investigated in a fixed bed reactor.The effects of the amount of potassium persulfate on the properties of the SAPO-18 molecular sieve samples and their MTO catalytic performance were investigated.The results showed that the amount of hydroxyl radicals(?OH)and the crystallinity of SAPO-18 molecular sieves were increased,and the morphologies of SAPO-18 molecular sieves were improved by adding appropriate amount of potassium persulfate in the synthetic gel.In addition,through evaluating the MTO process catalyzed by SAPO-18 molecular sieves,we found that the life of SAPO-18 molecular sieves were also increased with the presence of potassium persulfate in the synthetic gel.

关 键 词：分子筛 合成 过硫酸钾 羟基自由基 结晶 催化 

分 类 号：O643.36[理学—物理化学]