应用溶胶-凝胶法制备了SiO2/SnO2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SiO2/SnO2复合凝胶对丙酮气体和氨气的吸附动力学曲线.结果表明,SiO2与SnO2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＝c1(1-exp(-c2t)和x＝c′1t/(1+c2t)的形式,说明SiO2/SnO2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.
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