Synthesis, characterization of FAU/EMT intergrowths and its catalytic performance in n-pentane hydroisomerization reaction
作者:L.N. Belandría、C.S. Gonzàlez、F. Aguirre、E. Sosa、A. Uzcátegui、G. González、J. Brito、S.L. González-Cortés、F.E. Imbert
DOI:10.1016/j.molcata.2007.09.011
日期:2008.2
Zeolites FAU, EMT and their intergrowths were synthesized using 15-crown-5, 18-crown-6 and their equimolar mixture, respectively. The synthesized products were characterized by XRD, SEM-EDX, N2 adsorption and TPD-NH3. The solids obtained were all highly crystalline. The FAU samples were formed by octahedral submicrometric crystallites, EMT samples had hexagonal plate morphology of 2–5 μm. The intergrowth
分别使用15冠5、18冠6及其等摩尔混合物合成了沸石FAU,EMT及其共生体。通过XRD,SEM-EDX,N 2吸附和TPD-NH 3对产物进行表征。所获得的固体都是高度结晶的。FAU样品是由八面体亚微米晶体形成的,EMT样品的六角板形态为2–5μm。共生晶体是微米六边形板,八面体FAU微晶通过其六边形面相互生长。共混比例通过DIFFaX进行评估,根据模板/ Al 2 O 3的摩尔比,得出不同的共混比例。以及合成凝胶中使用的相对模板比例。对于模板/ Al 2 O 3为0.70的比例,获得了50%FAU / 50%EMT的共生比例,采用簇状堆叠,对于模板/ Al 2 O 3为0.30的共生比例为12%FAU / 88%具有两种堆叠方式的EMT:簇和随机。通过固体离子交换将铂结合到这些沸石及其共生物中。通过TEM评价金属分散液。对于大多数催化剂,铂颗粒在4至10 nm之间。所有催化剂对正戊烷转