采用低温氮吸附法分析了海绵钯在不同除气温度和时间条件下的比表面积,获得了海绵钯的低温吸附脱附等温线,对标准物质Al<,2>O<,3>粉末进行比表面积测定,并评价分析结果的精密性;采用BJH方程对吸附等温线进行孔径分布规律研究.结果认为,当除气时间为3 h时,海绵钯比表面积达到最大值0.38 m<'2>·g<'-1>,当除气时间大于3 h时,比表面积结果趋于稳定.除气时间太长不会对样品比表面积大小产生影响;在相同的除气时间条件下,海绵钯比表面积随除气温度变化趋势不太明显,温度100℃是海绵钯比表面积时较好的除气条件.采用氮气作吸附质对Al<,2>O<,3>标准样品进行比表面积测试,测试结果表明Al<,2>O<,3>标准样品M-BET和S-BET重复性分别为0.05,0.04 m<,2>·g<'-1>,比表面积测量重复性较好.根据海绵钯吸附-脱附等温线确定海绵钯属于第二类吸附等温线类型,在2～160 nm范围其孔径分布较宽.
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