One-pot synthesis of MWW zeolite nanosheets using a rationally designed organic structure-directing agent.
One-pot synthesis of MWW zeolite nanosheets using a rationally designed organic structure-directing agent.
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DOI：
10.1039/c5sc01912e
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发表时间：
2015-11-01
期刊：
影响因子：
8.4
通讯作者：
Román-Leshkov Y
中科院分区：
文献类型：
--
作者：
Luo HY;Michaelis VK;Hodges S;Griffin RG;Román-Leshkov Y
采用一种合理设计的有机结构导向剂，一锅法合成了一种由层状MWW分子筛纳米片组成的新型材料MIT-1。采用合理设计的有机结构导向剂（OSDA）一锅法合成了一种由分层MWW沸石纳米片组成的新型材料MIT-1。OSDA由类似于用于合成沸石前体MCM-22（P）的OSDA的亲水性头部片段、类似于用于溶胀MCM-22（P）的溶胀剂的疏水性尾部片段和连接两个片段的二季铵连接基组成。MIT-1具有高结晶度和超过500 m2 g-1的表面积，并且可以在宽的合成窗口内合成，所述合成窗口包括范围从13至67的Si/Al比。表征数据显示高的中孔性和酸强度，没有检测到无定形二氧化硅相。与MCM-22和MCM-56相比，MIT-1对苯与苯甲醇的Friedel-Crafts烷基化反应的催化活性提高了3倍。
A new material MIT-1 comprised of delaminated MWW zeolite nanosheets is synthesized in one-pot using a rationally designed organic structure-directing agent. A new material MIT-1 comprised of delaminated MWW zeolite nanosheets is made in a one-pot synthesis using a rationally designed organic structure-directing agent (OSDA). The OSDA consists of a hydrophilic head segment that resembles the OSDA used to synthesize the zeolite precursor MCM-22(P), a hydrophobic tail segment that resembles the swelling agent used to swell MCM-22(P), and a di-quaternary ammonium linker that connects both segments. MIT-1 features high crystallinity and surface areas exceeding 500 m2 g–1, and can be synthesized over a wide synthesis window that includes Si/Al ratios ranging from 13 to 67. Characterization data reveal high mesoporosity and acid strength with no detectable amorphous silica phases. Compared to MCM-22 and MCM-56, MIT-1 shows a three-fold increase in catalytic activity for the Friedel–Crafts alkylation of benzene with benzyl alcohol.