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等温吸附实验显示,同一黏土样品的甲烷吸附量随粒度减小有增加趋势,粒度减小不仅使颗粒内部的孔隙更多地暴露,而且使样品活化程度增高,增加了孔隙连通性、孔隙体积和表面积,从而使吸附量不断增加。孔隙测量表明,绿泥石黏土孔隙率低且以大孔为主,当粒度小于270目时,绿泥石样品的内表面积明显增加,其甲烷吸附量明显的升高。而蒙脱石黏土孔隙率高,以纳米级微孔隙为主,小于270目时可能部分孔隙被破坏,孔隙体积、表面积及甲烷吸附量出现轻微的减小。尽管粒度变化对不同大小孔隙的分布均有一定的影响,但样品表面积和气体吸附量主要受小于20nm,特别是小于10nm微孔隙变化的影响。为提高不同试样气体吸附量测定的准确性和可比性,150～250目粒度范围可作为气体吸附实验研究样品的标准粒度。
The isothermal adsorption experiments showed that the adsorption amount of methane in the same clay sample increased with the decreasing of particle size. The decrease of particle size not only exposed the pores inside the particles more, but also increased the activation of the sample, increased the connectivity of pores, increased the pore volume and Surface area, so that the amount of adsorption increased. Porosity measurements show that the chlorite clay has low porosity and macropores. When the particle size is less than 270 meshes, the internal surface area of chlorite samples increases obviously, and the methane adsorption amount obviously increases. The porosity of montmorillonite clay is high, which is dominated by nano-sized micropores. Some pores may be destroyed when the mesoporous silica is smaller than 270 mesh, and pore volume, surface area and methane adsorption amount decrease slightly. Although the change of particle size has some influence on the distribution of pores with different sizes, the sample surface area and gas adsorption capacity are mainly affected by the change of micropores less than 20nm, especially less than 10nm. In order to improve the accuracy and comparability of the determination of the gas adsorption amount of different samples, the particle size range of 150 ~ 250 mesh can be used as the standard particle size of the gas adsorption experiment.