| 简介 |
FIELD : chemistry.
SUBSTANCE : alumina supports are is proposed. They are prepared from alumina mass, of peptized nitric acid which as plasticizing additives contains an active alumina oxide and/or re-precipitated hydroxide aluminium and in addition includes trihydrate of aluminium with the following ratio of components, mass% : activated oxide of aluminium and/or re-precipitated hydroxide of aluminium (in-equivalent to Al2O3) 25.0-65.0, aluminium trihydrate (in-equivalent to Al2O3) the rest. Also variants of the supporters are proposed. They are additionally contain kaolin 0.5-6.0% mass and/or oxide of lanthanum (in-equivalent to La2O3) 0.1-1.0% mass. Methods of preparation of the specified supporters include formation of granules in the form of extrudates from alumina masses, peptised nitric acid, the subsequent stage-by-stage heat treatment of granules and high-temperature tempering at the temperature of 700-900°C. The challenges of the group of inventions are the expansion of the assortment of the specified alumina supporters, and also expansion of assortment of methods of preparation of alumina supporters.
EFFECT : increase in plasticity and pliability of alumina mass; increase in water absorption of the carrier; guarantee of uniform application and guarantee of a finely dispersed state of the layer of palladium; guarantee of the required depth of penetration of palladium into the granule; conducting of heat treating the extrudates at lower temperatures and reduction of material and power expenses.
8 cl, 12 ex |
客服热线：
手机版
二维码
