大孔γ-氧化铝的制备及其表征  

Preparation and Characterization of Macroporous γ-Al_2O_3

作　　者：肖锦春[1,2] 季洪海[1] 马波[2] 沈智奇[1] 王少军[1] 凌凤香[1,2] 

机构地区：[1]中国石化抚顺石油化工研究院,辽宁抚顺113001 [2]辽宁石油化工大学化学化工与环境学部,辽宁抚顺113001

出　　处：《石油化工》2015年第3期339-344,共6页Petrochemical Technology

基　　金：中国石化股份有限公司合同项目(113027)

摘　　要：以Al Cl3·6H2O为铝源、碳酸铵为沉淀剂、无水乙醇为溶剂,采用水热法制备了纳米γ-Al2O3。考察了CO32-与Al3＋的摩尔比（RAl）和无水乙醇用量（Val）对γ-Al2O3形貌和孔结构的影响。并利用XRD、SEM、TEM、TG-DSC、N2吸附-脱附、吡啶吸附FTIR等手段对试样进行表征。实验结果表明,RAl和Val对γ-Al2O3的形貌和孔结构均有较大影响,当RAl=2、Val=50 m L时,合成了具有高结晶度、高纯度,且具有规整条状形貌的大孔γ-Al2O3;大孔γ-Al2O3的表面积高达273 m^2/g、孔体积高达0.94 cm3/g、孔径集中分布在15-80 nm;大孔γ-Al2O3表面总酸量为0.255 mmol/g、中强酸为0.096 mmol/g,未出现强酸分布。Macroporous γ-Al2O3 was hydrothermally synthesized from Al Cl3·6H2O and（NH4）2CO3in absolute alcohol,and characterized by means of XRD,SEM,TEM,TG-DSC,N2 adsorptiondesorption and pyridine-FTIR. The effects of molar ratio of CO32-/Al3＋（RAl） and absolute alcohol dosage（Val） on the morphology and p ore structure of the macroporous γ-Al2O3 were studied. The result showed that the uniform strip-shape macroporous γ-Al2O3 with high crystallinity,high purity,BET specific surface area of 273 m^2/g,pore volume of 0.94 cm3/g and narrow pore diameter distribution of 15- 80 nm could be synthesized under the conditions of RAl of 2 and Val of 50 m L. The synthesized γ-Al2O3 has low total acidity of 0.255 mmol/g and medium strong acidity of 0.096 mmol/g without str ong acid.

关 键 词：大孔氧化铝 氯化铝 碳酸铵 无水乙醇 水热法 

分 类 号：TQ426.65[化学工程]