权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Embedding of Fine Particle Catalyst into Polymers and Its Catalytic Activity

细颗粒催化剂嵌入聚合物及其催化活性

基本信息

批准号：
61550600
负责人：
KAGAWA Shuichi
金额：
$ 1.28万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

In current liquid-phase catalytic processe, fine particles of metals such as nickel or palladium are widely used as catalysts in suspended state. If these fine particle catalysts can be embedded into a polymer matrix without reducing their intrinsic activity, various benefits other than easy handling of catalyst will be acquired. For example, a new type of catalytic reaction system may be developed with utilizing the hydrophobic property of polymer.In this research, fine particle catalysts of Ru/carbon and Pd/carbon were embedded into silicone rrubbers and their catalytic activities were examined for the hydrogenations of acetone and unsaturated fatty acid. It was found that, though the reaction rates decreased by about an order of magnitude by embedding, the diffusion of reactants in silicone rubbers was very fast not to impede the reaction rate and that embedded catalysts catalyzed the reaction effectively with the effectiveness factor of catalyst being unity. The reduction in catalytic activity of embedded catalysts was presumed to result from the poisoning of the vapor generated on vulcanization and the filling of micropores of Ru/carbon catalyst with silicone rubber. On the other hand, the selectivity of the intermediate products of consecutive reaction was significantly decreased by embedding of catalyst into polymer, probably because of the cage effect by polymer molecules. These new findings will provide a new concept of the polymer-embedded fine particle catalyst.

在目前的液相催化过程中，镍或钯等金属微粒被广泛用作悬浮状态下的催化剂。如果这些细颗粒催化剂能够嵌入到聚合物基质中而不降低其固有活性，除了易于操作催化剂外，还将获得各种好处。例如，利用聚合物的疏水性可以开发一种新型的催化反应体系。在本研究中，将Ru/碳和Pd/碳的细颗粒催化剂嵌入到硅橡胶中，考察了它们对丙酮和不饱和脂肪酸加氢的催化活性。结果表明，虽然包埋使反应速率降低了一个数量级左右，但硅橡胶中反应物的扩散速度很快，不会阻碍反应速度，包埋催化剂对反应有很好的催化作用，催化剂的效率因子是一致的。据推测，埋入催化剂的催化活性降低是由于硫化过程中产生的蒸汽中毒和硅橡胶填充Ru/碳催化剂的微孔所致。另一方面，由于聚合物分子的笼状效应，将催化剂嵌入到聚合物中会显著降低连续反应中间产物的选择性。这些新发现将为聚合物包埋细颗粒催化剂提供一个新的概念。