Multilamellar and pillared titanium Silicalite-1 with long-range order of zeolite nanosheet layers: Synthesis and catalysis
Multilamellar and pillared titanium Silicalite-1 with long-range order of zeolite nanosheet layers: Synthesis and catalysis
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DOI：
10.1016/j.micromeso.2019.01.010
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发表时间：
2019-04
影响因子：
5.2
通讯作者：
Wei Wu;Dat T. Tran;Xianyuan Wu;Su Cheun Oh;Manyun Wang;Huiyong Chen;L. Emdadi;Junyan Zhang;Emily Schulman;Dongxia Liu
中科院分区：
文献类型：
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作者：
Wei Wu;Dat T. Tran;Xianyuan Wu;Su Cheun Oh;Manyun Wang;Huiyong Chen;L. Emdadi;Junyan Zhang;Emily Schulman;Dongxia Liu
硅钛-1 （TS-1）纳米片可以由含有氢氧化二季铵模板的前驱体凝胶合成。TS-1纳米片倾向于形成单片状，无序地相互连接。TS-1纳米片的柱状结构保留了纳米片的介孔性，但缺乏纳米片层的长程有序性。在这里，我们报道了由含有己二胺（C6DN）和溴化二季铵模板（C22-6-6Br2）的前驱体凝胶合成具有长程有序纳米片层的多层TS-1 （M-TS-1）。M-TS-1柱化产生柱状TS-1 (P-TS-1)，具有良好的介孔性和长程层序。考察了C22-6-6Br2、C6DN和Ti前驱体的浓度以及结晶时间对产物M-TS-1的影响。研究了M-TS-1和P-TS-1分子筛的理化性质，并与传统的TS-1分子筛进行了比较。P-TS-1中介孔的存在提高了其在大分子反应中的催化性能。
Titanium silicalite-1 (TS-1) nanosheets can be synthesized from the precursor gels containing a diquaternary ammonium template in hydroxide form. The TS-1 nanosheets tend to form unilamellae interconnected in disordered aggregates. Pillaring of TS-1 nanosheets preserves the mesoporosity, but lacks long-range order of nanosheet layers. Here, we report synthesis of multilamellar TS-1 (M-TS-1) with long-range order of nanosheet layers from the precursor gels containing hexanediamine (C6DN) and diquaternary ammonium template in bromide form (C22-6-6Br2). Pillaring of M-TS-1 produced pillared TS-1 (P-TS-1) with well-preserved mesoporosity and long-range order of layers. The influences of concentrations of C22-6-6Br2, C6DN, and Ti precursor as well as crystallization time, on the resultant M-TS-1 were investigated. The physicochemical properties of the M-TS-1 and P-TS-1 were studied and compared to the conventional TS-1 zeolite. The presence of mesopores in P-TS-1 enhanced the catalytic performance in reactions involving bulky molecules.