钠含量对片状α-Al2O3性能的影响  

Effects of Sodium Content on the Properties of Laminatedα-Al_2O_3 Platelets

作　　者：苗壮[1] 史建公[1] 郝建薇[2] 郑建坡 MIAO Zhuang,SHI Jiangong,HAO Jianwei,ZHENG Jianpo(SINOPEC Catalyst （Beijing）Co.Ltd.,Beijing 102400,China;2School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]中国石化催化剂(北京)有限公司,北京102400 [2]北京理工大学材料科学与工程学院,北京100081

出　　处：《石油学报（石油加工）》2018年第3期481-486,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：中国石化催化剂有限公司科研项目(14-05-01)基金资助

摘　　要：以拟薄水铝石和三水铝石为原料,氟化铵为添加剂,采用固相法合成片状α-Al_2O_3的过程中,通过SEM、原子吸收光谱法、XRD、压汞法、BET法、吡啶红外吸附等手段研究了NaNO_3添加量对片状α-Al_2O_3结构和性能的影响。研究结果表明,随NaNO_3加入量的增加,片状α-Al_2O_3的微观形貌逐渐由六方片状结构向无规则片状结构转变。高温焙烧导致大量Na挥发。残留在α-Al_2O_3中的Na存在于β-Al_2O_3结构中。α-Al_2O_3表面无酸性中心,β-Al_2O_3的生成并不影响片状α-Al_2O_3的表面酸性。Theα-Al2O3 platelets were prepared via the solid-state reactions using pseudo-boehmite and gibbsite as the starting materials,ammonium fluoride as the additive.The effect of the additive amount of NaNO3 on the property of theα-Al2O3 platelets was investigated by SEM,AAS,XRD,mercury intrusion porosimetry,BET,and pyridine-thermal desorption-infrared methods.The results illustrate that the introduction of NaNO3 leads to the change of morphology ofα-Al2O3 platelets from hexagonal laminated structure to irregular structure.Most of Na is volatilized undergoing calcinations at high temperature.The residual Na is in the form ofβ-Al2O3 in aggregates ofα-Al2O3 platelets.The surface ofα-Al2O3 platelets has no acid center,while the existence ofβ-Al2O3 has no effect on the surface acidity ofα-Al2O3 platelets.

关 键 词：固相法 片状α-Al2O3 NaNO3 性能 

分 类 号：TQ426.65[化学工程]