Syngas Production by Partial Oxidation of Methane with Oxygen Permeable Membrane

透氧膜部分氧化甲烷生产合成气

基本信息

批准号：
11450309
负责人：
MATSUKATA Masahiko
金额：
$ 9.47万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2002
项目状态：
已结题

项目摘要

Zeolites have been synthesized by the hydrothermal synthetic method Recently, the dry gel conversion method as the technique of zeolite crystallization was developed. In this report, we investigated the crystallization mechanism of various type of zeolites synthesized by the conventional hydrothermal synthetic method and novel dry gel conversion method. We focus particularly on the aluminosilicate species in not only the atomic scale level, but also in a nano-scale level.In the case of the hydrothermal synthesis of MFI-type zeolite, when the solubility of aluminosilicate species was low, it was obvious that MFI-type zeolite consisted of aggregate of nano-particles in a diameter of several dozen nanometers. Moreover, it was possible that silicateli-1 was formed by the solid-solid transformation directly from amorphous nano-particles to fine MFI-type crystals.In the case of the synthesis of EMT-type zeolite by using the dry gel conversion method, we found out that nano-particles fuse and the surface of the dry gel is rearranged, resulting in a distinct hexagonal shape for the EMT crystals.Additionally, since we suggested that alinninosilicate species having die framework structure of ZSM-5 zeolite exist in the filtrate of alkaline dissolution of ZSM-5, we succeeded the mesoporous materials having a strong acidity caused by the structure of zeolite framework was synthesized by using the aluminosilicate species in the filtrate of alkaline dissolution of ZSM-5.In conclusion, we investigated the crystallization mechanism of zeolites, focusing on the structural species in a nano-scale level, and the novel acidic catalyst was prepared by using the species having the framework structure of zeolite in a nano-scale.

沸石已通过水热合成法合成。最近，开发了干凝胶转化法作为沸石结晶技术。在本报告中，我们研究了通过传统水热合成方法和新型干凝胶转化方法合成的各种类型沸石的结晶机理。我们不仅特别关注原子尺度水平的铝硅酸盐物质，而且还关注纳米尺度水平的硅铝酸盐物质。在水热合成MFI型沸石的情况下，当硅铝酸盐物质的溶解度较低时，很明显： MFI型沸石由直径为几十纳米的纳米颗粒聚集体组成。此外，silicateli-1有可能是通过直接从无定形纳米颗粒到细MFI型晶体的固-固转变而形成的。在使用干凝胶转化法合成EMT型沸石的情况下，我们发现纳米粒子融合并且干凝胶的表面重新排列，导致 EMT 晶体具有独特的六边形形状。此外，由于我们提出具有以下骨架结构的铝硅酸盐物种ZSM-5碱溶滤液中存在ZSM-5沸石，我们利用ZSM-5碱溶滤液中的硅铝酸盐成功合成了由沸石骨架结构引起的具有强酸性的介孔材料。总之，我们研究了沸石的结晶机理，重点关注纳米级的结构物种，并利用具有以下骨架结构的物种制备了新型酸性催化剂纳米级沸石。