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首页> 外文期刊>Journal of Materials Science >Influence of chemical vapour infiltration conditions of acetylene on the structural and textural properties of EMT-type zeolite nanocasted carbon replica
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Influence of chemical vapour infiltration conditions of acetylene on the structural and textural properties of EMT-type zeolite nanocasted carbon replica

机译：乙炔的化学气相渗透条件对EMT型沸石纳米浇铸碳复制体的结构和组织性能的影响

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摘要

Ordered microporous carbons were synthesized by the nanocasting process using EMC-2 zeolite (EMT structure type) and acetylene as a mould and a carbon precursor, respectively. In this study, the conditions of the synthesis methods for preparing the ordered microporous carbons were examined. Temperature and duration parameters for the chemical vapour infiltration were optimized to yield an ordered carbon replica that displays up the three XRD diffraction peaks. This faithful replica exhibits also a high micropore volume (1.3–1.4 cm3/g) with mainly supermicroporosity, a high specific surface area (>2900 m2/g) and nearly no mesoporosity. The pore size distribution calculated with NLDFT method from nitrogen physisorption data shows three maxima at 0.6, 1.0 and 1.8 nm diameters. The second is due to the zeolite wall dissolution. The first and the third are attributed to different types of default. Compared to the classical two-step procedure, the direct infiltration with acetylene appears an interesting route for the preparation of ordered microporous carbon replicas with high micropore volume.
机译：通过纳米浇铸工艺分别使用EMC-2沸石（EMT结构类型）和乙炔作为模具和碳前驱体合成有序的微孔碳。在这项研究中，检查了制备有序微孔碳的合成方法的条件。优化了化学气相渗透的温度和持续时间参数，以产生显示三个XRD衍射峰的有序碳复制品。这种忠实的复制品还具有较高的微孔体积（1.3–1.4 cm 3 / g），主要具有超微孔性，较高的比表面积（> 2900 m 2 / g）和几乎没有介孔。根据氮的物理吸附数据，使用NLDFT方法计算的孔径分布显示出在0.6、1.0和1.8 nm直径处的三个最大值。第二是由于沸石壁溶解。第一个和第三个归因于不同的默认类型。与经典的两步法相比，乙炔的直接渗透似乎是制备具有高微孔体积的有序微孔碳复制品的有趣途径。

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