微孔椰壳焦孔结构表征

为了更深入地了解微孔生物质焦的孔隙结构特征，在水蒸气气氛下制备椰壳焦（CSCs），并且采用了不同分子探针、计算模型和校准步骤对其进行表征。结果表明，椰壳焦有较高的碳含量和比较丰富的孔隙度，适合进一步活化以制备活性炭。表征椰壳焦较为合适的方法是：以Ar为分子探针，并采用非定域密度泛函（NLDFT）模型。当校准步骤优先进行时，以N₂和Ar为分子探针的吸附测试结果如孔径分布（PSD）和吸附等温线会受到孔隙阻塞的影响，从而错误地描述椰壳焦的孔隙结构。实验结果还表明，273 K下仪器的真空处理可以去除绝大部分残留的He，降低孔隙阻塞的影响。

Pore structure characterization of coconut shell char with narrow microporosity

To get more insight into the pore structure characterization of nanoporous biomass chars, different probe molecules, models, and calibration steps were used and compared. The coconut shell chars (CSCs) were prepared under a steam atmosphere and characterized using N₂, Ar, and CO₂ adsorption. The results show that coconut shell chars are suitable for further activation, due to the high carbon content and abundant porosity. Ar adsorption with application of Non-Local Density Functional Theory (NLDFT) model can more accurately characterize the pore structure of CSC. When the calibration step is performed before adsorption measurement, the important results of N₂ and Ar adsorption, such as pores size distribution (PSD) and isotherm, are affected by pore blocking, leading to the erroneous understanding of CSC in special applications. Vacuum treatment at 273 K for 1 h after He calibration is enough to remove He, which could reduce effect of pore blocking.