Efficient Determination of Specific Surface Area of Shale Samples Using a Tracer-Based Headspace Gas Chromatographic Technique

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• 作者：Liang He ; Teng-Fei Li ; Xin-Sheng ChaiHui Tian ; Xian-Ming Xiao ; Donald G. Barnes
• 刊名：Analytical Chemistry
• 出版年：2017
• 出版时间：January 3, 2017
• 年：2017
• 卷：89
• 期：1
• 页码：974-979
• 全文大小：375K
• ISSN：1520-6882

文摘

This paper reports on a novel method for determining the specific surface area (SSA) of shale via headspace gas chromatography (HS-GC). The method is based on the water adsorption on the surface of shale sample after achieving phase equilibrium at an elevated temperature (i.e., heating at 125 °C for 48 h). A mathematical model shows that the SSA can be determined from the signal of the vapor water released during HS-GC analysis. The results obtained by this method correlated well (R² = 0.992) with data obtained by the reference BET method. Because the phase equilibrium step for multiple samples can be conducted simultaneously, and because the phase re-equilibrium step is much faster in the HS-GC measurement, the present method is more efficient for batch sample testing.