tapo-5分子筛及其膜合成.pdf

U Y21791 11 磷酸铝分子筛具有分子尺度均匀而规则的孔道结构,起筛分分子的作用,且有化学稳定性好、热稳定性好、机械强度高等优点,在吸附分离、催化剂等领域有巨大的应用潜力。负载在无机多孔载体上的磷酸铝分子筛膜,用于工业过程时能大大提高产物分离率和选择性,在连续分离、膜反应器、化学传感器等领域有光明的应用前景。,更因Ti原子的可变价性质, 在有H202参与的一系列氧化反应中表现出优异的催化性能。虽然已有很多关于 ,。。采用原位水热法时,研究了pH、;分别用Ti02、Mn02和Si02对载体进行改性处理,探讨载体改性对 。采用蒸汽辅助凝胶转化法时,研究了凝胶的老化模式、晶化模式、:,与原位水热法合成的分子筛膜作了对比,并研究了老化模式、。合成的样品用XRD、SEM和UV-Vis进行表征。结果表明:,pH值和晶化温度影响TAPO一5分子筛的形貌和 n原子存在状态,动态晶化模式只影响形貌,对Ti原子存在状态无影响:Ti02 ,Mn02改性载体上的分子筛膜呈一定C 向有序性,。凝胶转化法比原位水热法晶化时间短,,且有利于钛原子进入骨架。凝胶的老化和动态晶化影响分子筛的形貌但不影响钛原子存在状态,HF的加入不利于钛原子进入骨架。采用蒸汽辅助凝胶转化法以及对凝胶进行老化,有利于形成交联性的分子筛膜。关键词: SYNTHESIS MOLECULAR SIEVES AND MEMBRANES ABSTRACT Aluminophosphate molecular sieves have uniform and regular channels at molecular scale showing molecule—sieving effect,as well as good chemical, mechanical,and thermalstabilities,showing greatapplicationpotential inthefieldsof separation sievemembranes anic porous substrates, when usedinindustrialprocess,Cangreatly improve theseparation rateandselectivity ofproducts,having abrightapplication prospect in continuous separation,membrane reactor,chemical sensor,and SO molecular sieve not only hasthose propertiesmeqtioned above,but alsohas excellent catalyticproperties inseriesof oxidationreactions inwhichhydrogen peroxidepresents,due tothevariety invalence are many literaturesrelated toAIP04·5membrane,but no public study about TAPO一5 membrane isreported. Inthisthesis,TAPO一5 molecular sievesandmembranes have beeninvestigated using insituhydrothermal synthesis method and steam—assistedgel conversion method. Using insituhydrothermal method,the effectsofsynthesis conditions,such aspH value,crys