Development of a new size-control method for nano-crystalline zeolite and its rational design as a catalyst

本研究的主要目的是控制沸石晶体的尺寸合成和开发纳米沸石催化剂的设计方法。合成了多种类型的沸石（MFI、TON、MOR、BEA、FAU和MTW），并成功地控制了它们的晶粒尺寸。特别是MFI-型、MOR-型、MTW-型、ton -型分子筛，得到了粒径在100 nm以下的纳米晶分子筛和粒径在1000 nm以上的大晶分子筛。以沸石为催化剂，分别用甘油和2-甲基萘制备丙烯醛和2,6-二甲基萘（2,6- dmn）。结果表明，TON分子筛的丙烯醛收率高达80%以上，MFI分子筛和MTW分子筛可选择性地制备2,6- dmn。此外，沸石的晶体尺寸影响产物的选择性和催化剂的稳定性，采用纳米沸石作为催化剂后，这两个数值都得到了显著提高。

Main objective of this research is a size-controlled synthesis for zeolite crystal and a development of design method for nano-zeolite catalyst. Various types of zeolites (MFI, TON, MOR, BEA, FAU and MTW) were synthesized and their crystal sizes could be successfully controlled. Especially, in MFI-，MOR-，MTW-，TON-type zeolites, the nano-crystalline zeolites with the size below 100 nm and macro-crystalline zeolite with the size above 1000 nm were obtained.Acrolein production from glycerol and 2,6-dimethyl naphthalene (2,6-DMN) production from 2-methyl naphthalene were conducted using zeolite catalysts. It is found that TON zeolite exhibits a high yield of acrolein above 80 % and that 2,6-DMN is selectively produced using MFI and MTW zeolites. Moreover, the crystal sizes of zeolite affect the product selectivity as well as the catalyst stability, the values of which are drastically improved by applying the nano-crystalline zeolite as a catalyst.