Standardization of Solid Superacid of Sulfated Zirconia Prepared Using Zirconia Supplied by Catalysis Society of Japan

使用日本催化学会提供的氧化锆制备的硫酸化氧化锆固体超强酸的标准化

基本信息

批准号：
18636016
负责人：
MATSUHASHI Hiromi
金额：
$ 1.34万
依托单位：
Hokkaido University of Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至无数据
项目状态：
已结题

项目摘要

A recommended preparation procedure and applying method for some catalytic reactions were proposed based on the results of this investigation.As the starting material for catalyst preparation, JRC-ZRO-2 and-5 supplied by Catalysis Society of Japan are recommended. Zirconia gel should be well dried before sulfation at 300 ℃ or below.Two preparation methods of equilibrium adsorption method and ammonium sulfate kneading method had been investigated. The zirconia gel was sulfated with high reproducibility in both procedure. The sulfated zirconia with high surface area and high sulfate content was obtained when the non crystallized gel was used. The reproducibility of sulfate content on the surface was high in the ammonium sulfate kneading method. However, there was a tendency that unnecessary sulfate ions, which did not relate to the formation of active sites, remained on the surface. The recommended calcinations temperature is 650 ℃. From the reason of temperature distribution in a furnace, the calcinations at 600 ℃ is strongly recommended.The sulfated zirconia can be kept without care because this was calcined at high temperature. This can be applied for several reactions without pretreatment. It is desirable to remove adsorbed water by heating before use. The pretreatment at 500 ℃ is avoided because the decrease of acid amount was observed in some cases.Thermogravimetry is recommended as the method to confirm the sulfated zirconia production. The temperature of weight decrease accompanying the decomposition of sulfated ions should be checked.

根据这项投资的结果提出了一种建议的制备程序和应用方法对某些催化反应提出。作为催化剂制备的起始材料，建议日本催化学会提供的JRC-ZRO-2和-5。在300℃或以下硫酸化之前，应将氧化藻凝胶干燥。两种制备方法的制备方法已经研究了平衡吸附方法和硫酸铵揉捏方法。在这两种过程中，锆凝胶均硫化高可重现性。当使用非结晶凝胶时，获得了高表面积和高硫酸盐含量的硫酸化氧化锆。在硫酸铵跪方法中，硫酸盐含量在表面上的可重复性很高。但是，存在一种趋势，即与活性位点形成无关的不必要的硫酸盐离子保留在表面上。推荐的钙温度为650℃。从炉子中温度分布的原因，强烈建议使用600℃的钙化。可以在高温下钙化硫酸化的氧化锆。这可以用于几种反应而无需预处理。希望在使用前加热去除吸附的水。由于在某些情况下观察到酸的减少，因此避免了在500℃时进行预处理。建议将甲基囊杆菌作为确认硫酸化氧化锆产生的方法。应检查硫化离子分解中的重量降低。