CAJ | 학술논문

基于多分子层吸附理论的BET模型是最成熟、最常用于比表面测试的计算方法，然而，针对页岩样品在液氮温度下的氮气吸附数据，选取0．05～0．30间的相对压力点（适用于中孔材料）进行BET比表面计算时，将出现回归曲线相关系数较差、常数C为负值（无物理意义）情况，这一问题往往被测试者忽视。通过页岩的二氧化碳吸附数据运用DFT模型，计算出页岩的微孔分布可知，页岩含有大量0．5～1．0 nm之间的微孔，页岩纳米级孔隙分布范围广的特点是出现上述问题的根本原因，即页岩并非孔径分布较窄的介孔材料。通过调整相对压力点的选取范围，在相对压力0．05～0．20下计算页岩比表面其相关系数能达到0．9999以上，且在Y轴上产生正截距，该相对压力范围更为合理，计算出的BET比表面更为可靠。
기우다분자층흡부이론적BET모형시최성숙、최상용우비표면측시적계산방법，연이，침대혈암양품재액담온도하적담기흡부수거，선취0．05～0．30간적상대압력점（괄용우중공재료）진행BET비표면계산시，장출현회귀곡선상관계수교차、상수C위부치（무물리의의）정황，저일문제왕왕피측시자홀시。통과혈암적이양화탄흡부수거운용DFT모형，계산출혈암적미공분포가지，혈암함유대량0．5～1．0 nm지간적미공，혈암납미급공극분포범위엄적특점시출현상술문제적근본원인，즉혈암병비공경분포교착적개공재료。통과조정상대압력점적선취범위，재상대압력0．05～0．20하계산혈암비표면기상관계수능체도0．9999이상，차재Y축상산생정절거，해상대압력범위경위합리，계산출적BET비표면경위가고。
The theory of BET model which based on multi-molecular layer adsorption is the most commonly and mature method used for specific surface testing .For the nitrogen adsorption data of shale samples which at liquid nitrogen testing temperature , slectting the relative pressure from 0.05 to 0.30 between ( indicated for mesoporous materials) the BET specific surface of the sample can be calculated , but it will appear the problem of poor correla-tion coefficient and negative constant C which is not allowed to happen , the problem is often subject to ignore .The micropore pore size distribution calculated by carbon dioxide adsorption data using the DFT model shows shales con -tain a mount of microporous which aperture between 0.5 ~1.0 nm.The characteristics of shales nanometer pore distribution is the fundamental reason for the emergence of above problems .In other words , shale is not the meso-porous materials and narrower pore size distribution .On the contrary , by selecting the relative pressure which from 0.05 to 0.20 calculating the specific surface , the correlation coefficient reached more than 0.999 9, and emerged positive intercept on the Y axis, the relative pressure range is more reasonable , and the calculated BET specific sur-face is more reliable .