孔形羟基磷灰石负载锶化合物催化剂的制备与表征  

Preparation and characterization of a strontiumbased solid base catalyst supported on porous hydroxyapatite

作　　者：陈伟[1] 黄志良[1] 刘羽[1] 何前军[1] 许涛[1] 

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430073

出　　处：《工业催化》2007年第5期64-69,共6页Industrial Catalysis

基　　金：湖北省科技厅重大攻关项目(2006AA101C45);湖北省自然科学基金项目(2005ABA024)

摘　　要：通过在873 K焙烧Sr(NO3)2/孔形羟基磷灰石,成功地制备了一种新型的固体碱催化剂,并对其进行TG-DTA、XRD、IR、SEM、BET和碱强度表征。结果表明,在873 K,发生固相离子交换反应——Ca5[PO4]3-y(CO3.OH)y](OH)+SrO Ca5-xSrx[PO4]3-y(CO3.OH)y](OH)+CaxSr1-xO,孔形羟基磷灰石表面上的新相CaxSr1-xO能抑制羟基磷灰石的分解,并能阻止羟基磷灰石的重结晶,使羟基磷灰石在高温下保持孔形结构。用此固体碱催化剂催化大豆油与甲醇的酯交换反应,可使豆油的转化率达到85%。A novel solid base catalyst was prepared by calcining Sr（ NO3 ）2/porous hydroxyapatite at 873 K and characterized by TG, DTA, XRD, IR, SEM, BET and Hammett indicators. The results showed that solid phase ion-exchange reaction, -Ca5[PO4]3-y（CO3·OH）y]（OH）4-SrO→Ca5-ISrx[PO4]3-y（CO3·OH）y]（OH）＋CaxSr1-xO,, occurred at 873 K, and resulted in formation of Ca,SrI _,O phase on the surface of porous hydroxyapatite, which inhibited decomposition and reerystaUi- zation of porous hydroxyapatite and helped to maintain its porous framework at higher temperature. Soybean oil conversion of 85% was obtained for transesterifieation of soybean oil with methanol catalyzed by the solid base catalyst.

关 键 词：孔形羟基磷灰石 固体碱 非均相催化剂 酯交换 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]