微波快速合成4A分子筛过程中镧复盐的作用  

Role of Lanthanum Double Salt in Rapid Synthesis of Zeolite 4A under Microwave Heating

作　　者：钟声亮[1] 张迈生[1] 苏锵[1] 

机构地区：[1]中山大学化学与化学工程学院,广州510275

出　　处：《应用化学》2005年第8期865-869,共5页Chinese Journal of Applied Chemistry

基　　金：广东省科技攻关基金(2002C31601);广州市科技重点攻关基金(2003Z2-D2081);广州市基础研究基金(2002G1-C0351);北京大学稀土材料化学与应用国家重点实验室开放课题基金(200409)资助项目

摘　　要：用微波辐射法快速合成了4A分子筛,考察了硫酸镧硫酸钠复盐(LNS)对制备4A分子筛的影响。发现LNS的加入使4A分子筛的晶化速度加快近1倍,微波法比传统法合成速度快10倍左右。微波场作用下合成4A分子筛的白度为94%,钙离子交换容量为每克干沸石310mgCaCO3,平均粒度为2.561μm;而在合成过程中加入LNS后产物的白度为96%,钙离子交换容量为每克干沸石318mgCaCO3,平均粒度为1.958μm。此外,LNS的加入还起到球化剂的作用,使合成产物晶形呈现球形。Zeolite 4A was rapidly synthesized under microwave heating, and the effect of the addition of lanthanum sulfate and sodium sulfate（LNS for short） on the synthesis was studied. It was found that with the addition of LNS the crystallization rate of zeolite 4A almost doubled, and the crystallization rate in microwave field was about ten times faster than that under conventional heating. The whiteness of the products obtained in microwave field was 94% , the calcium ions exchange capacity 310mg CaCO3/g dry zeolite, and the average particle size 2. 561μm. With the addition of LNS, the whiteness was 96% , the calcium ion exchange capacity 318 mg CaCO3/g dry zeolite, and the average particle size 1. 958μm. Moreover, the LNS acts as a modulizer, and the crystal form of zeolite 4A became spherical with the addition of LNS.

关 键 词：4A分子筛 硫酸镧硫酸钠复盐 微波合成 

分 类 号：O611.4[理学—无机化学]