Development time of specific surface area analyzer

The solid surface has adsorption characteristics, and coal adsorbs gas and liquid. The surface area and porosity play a major role in the adsorption phenomenon, so the strength of the adsorption is closely related to the surface area. The larger the surface area, the stronger the adsorption. The specific surface area of ​​coal is an important parameter of the special processing technology and gasification technology of coal. Because nitrogen is a chemically inert gas and chemical adsorption is not likely to occur at the temperature of liquid nitrogen, the low temperature nitrogen adsorption method is the most commonly used method for measuring specific surface area.

The larger the specific surface, the larger the surface if there are holes in the particle surface. Some very important powder materials are deliberately made into porous morphology, such as molecular sieves, catalysts, and adsorbents, and their characteristics are directly related to their pore size, morphology, and distribution. For them, pore size distribution is an extremely important Characteristic index.

Specific surface is the abbreviation of specific surface area meter. Specific surface area refers to the total area per unit mass of material. There are two types of external surface area and internal surface area. The unit is m2 / g. The ideal non-porous material only has an external surface area, diatomaceous earth, etc. Measurement methods include volumetric adsorption method, gravimetric adsorption method, flow adsorption method, ventilation method, and gas adhesion method.

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