SiO_2/SnO_2复合凝胶对丙酮和氨气的吸附动力学研究  

Studies on the Adsorption Dynamics to Acetone and Ammonia Gases of SiO_2/SnO_2 Gels

作　　者：王海霞[1] 蒲敏[1] 刘永明 吴成明 马倩玲 

机构地区：[1]西安交通大学理学院应用化学系,西安710049

出　　处：《材料导报》2002年第7期73-75,共3页Materials Reports

基　　金：陕西省自然科学基金(98H04);中国科学院山西煤炭化学研究所煤转化国家重点实验室基金(99)

摘　　要：应用溶胶-凝胶法制备了SiO_2/SnO_2复合凝胶,测定了红外光谱,采用静态吸附法测定了不同组成的SiO_2/SnO_2复合凝胶对丙酮气体和氨气的吸附动力学曲线。结果表明,SiO_2与SnO_2凝胶的复合有利于气体的吸附,在凝胶中含有一定的羟基是吸附性强的根源。数据拟合得到的吸附动力学方程分别为x=c_1(1-exp(-c_2t)和x=c′_1t/(1+c′_2t)的形式,说明SiO_2/SnO_2复合凝胶对丙酮气体和氨气的吸附机理分别具有单活性位和双活性位吸附特征。SiO2/SnO2 gels were prepared by sol gel method.The chemical structures of the gels were characterized by FT-IR spectra.The adsorption dynamical curves to acetone and ammonia gases by SiO2/SnO2 gels were measured.The results show that the composite of SiO2 with SnO2 favours adsorption of ammonia and acetone gases.The fitted eqviations of the adsorption dynamical curves have the form of x = c1(1-exp(-c2t))and x= c't/(1+c'2t).It is demonstrated that the adsorptioin mechanism of gels involves single or two active site adsorption.

关 键 词：SiO2/SnO2复合凝胶 丙酮 氨气 二氧化硅 二氧化锡 吸附动力学 

分 类 号：O647.31[理学—物理化学]