成型工艺条件对铈锆铝复合载体性能的影响

Influence of technological conditions on physical-chemical properties of CeO2-ZeO2-Al2O3 composite carrier

采用压缩成型法对铈锆铝复合载体进行了放大制备,考察放大制备过程中造粒粉含水量、成型压力、焙烧温度等成型工艺条件对载体机械强度、吸水量、密度、织构性质及晶相的影响。结果表明,造粒粉含水量是影响颗粒成型的主要因素,含水量过高,颗粒不能成型或容易层裂;成型压力是影响载体强度、吸水量、密度等机械性能的主要影响因素,适宜的成型压力有助于获得各项机械性能均衡的载体;焙烧温度是影响载体比表面积及晶相结构的关键因素。结合生产要求确定最佳工艺条件为造粒粉含水量为15%,半成品强度(7~9)N·mm-1,焙烧温度(800~900)℃。

CeO 2-ZrO 2-Al 2 O 3 composite carriers were prepared by compression forming process.The effects of molding process conditions including moisture content,molding pressure of the granulated powder and calcination temperature on properties of the carrier during the amplification preparation process were investigated such as mechanical strength,water absorption,density and texture properties and so on.The results show that water content is the main factor affecting the formation of granulated powder.When water content is too high,the particles are fragile or can t be formed;The molding pressure is a main influencing factor for the mechanical properties such as strength,water absorption and density of the carrier.Suitable molding pressure helps to obtain a carrier with balanced mechanical properties;Calcination temperature is a key factor affecting the specific surface area and crystal phase structure of the carrier.The optimum process conditions determined according to the production requirements are that water content of the granulated powder is about 15%,the strength of the semi-finished product is(7~9)N·mm-1,and the roasting temperature is(800~900)℃.