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比表面积是每克物质中所有颗粒总表面积之和，是衡量粉体材料粒子粗细（或粒径大小）的指标。孔结构参数包括孔容积与孔径分布等，其中孔容积决定最大吸附量。比表面积的大小与孔结构参数共同影响物质的许多物理及化学性能。活性炭是一种微小炭粒，比表面积大，催化活性和化学稳定性好，所以被广泛应用于吸附剂和催化剂载体。测试活性炭的比表面积与孔结构参数对于了解活性炭的吸附性能具有重要意义。 本文用氮吸附方法测定活性炭样品的比表面积、孔容积与平均孔径，考察了脱气温度、脱气时间等对活性炭比表面积测试的影响。实验结果表明，脱气时间3h，脱气温度300℃是适宜的；活性炭样品的质量选在0.1600g左右，即总表面积在110～113m2时测试值较准确；多点法测试比表面积时，测试点数量越多测试值越准确，为提高实验速率，选用4个点时的相对误差在实验允许误差范围内，能够满足实验要求；单点法测试比表面积的相对误差在5%以内，单点法作为一种快捷简便的近似方法，基本能够满足实验要求。 |
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sltmac: 金币+20, 翻译EPI+1 2012-07-30 10:33:00
sltmac: 金币+20, 翻译EPI+1 2012-07-30 10:33:00
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仅供参考哈，某些专业用词可再斟酌 Specific surface area is the sum of the surface areas of all the particles in 1 gram of the material. It indicates the particle size of powder materials. Indices of pore structure includes pore volume and pore size distribution, and the pore volume determines the maximum adsorptive capacity. Many of the physical and chemical properties are dependant on the specific surface area and pore structure. As tiny carbon particles with huge specific surface area, excellent catalystic activity, and good chemical stability, activated carbon is widely applied as adsrobent and catalystic carrier. It is of great importance for understanding the adsorption behavior of activated carbon to investigate the specific surface area and pore structure. In the present study, the method of nitrogen adsorption was employed to test the activated carbon samples for the specific surface area, pore volume and average pore size. The influence of the temperature and duration of out-gassing to the tests was also investigated. Results suggested that it was the optimal treatment when the samples were out-gassed under 300oC for 3h. To obtain the most reliable value, a sample weight of around 0.1600g was selected, when the total surface area was in the range of 110-113 m2. When tested by multi-point determination, the more the points applied, the more acurate the result would be. In order to enhance the test efficiency, a 4-point determination was selected, and the coeffeicient of variance met the requirement of the test. For single-point determination, the coeffeicient of variance was less than 5%. As a simple and rapid determination, it could meet the basic test requirement. |
3楼2012-06-29 00:06:03