Specific surface area detection method of activated carbon
Activated carbon is a kind of microcrystalline carbon material made of carbon-containing material with black appearance, developed internal pore structure, large specific surface area and strong adsorption capacity. It is a commonly used adsorbent, catalyst or catalyst carrier.
In order to unify the standard and make the production controllable, in the activated carbon industry, the adsorption value is usually used to judge the quality of the activated carbon, that is, the higher the adsorption value, the stronger the adsorption capacity of the activated carbon.
The specific surface area detection of activated carbon is currently based on the BET test method, and the national standard (GB/T 19587-2004)-gas adsorption BET principle is used to determine the specific surface area of ​​solid materials.
However, the adsorption and desorption process of activated carbon on nitrogen is irreversible, so the data is only true and reliable using the adsorption isotherm curve. There are many instruments in China that can only detect the desorption isotherm curve, and it takes a long time. Due to the different adsorption capacity of the sample, it may take a whole day for some samples to be tested. The JW-BK static specific surface area analyzer produced by Jingbo Gaobo is an instrument that can truly realize the analysis function of the adsorption process (both direct contrast method). , BET method and other methods), at the same time can test the specific surface area and pore diameter of activated carbon, and can carry out 1-2 test samples at the same time, can also carry out vacuum heating pretreatment of 3 samples at the same time, more importantly JW- The BK static specific surface area analyzer is the only instrument that has obtained the high-tech new product certificate of its kind in China. It is a fully automated and intelligent specific surface area and pore size analysis and testing equipment. Its test results are highly consistent with international consistency and high stability. Test result accuracy.
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