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Optimization the Process of Chemically Modified Carbon Nanofiber Coated Monolith via Response Surface Methodology for CO2 Capture

机译：响应面法优化化学修饰碳纳米纤维包覆整料的捕集工艺

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摘要

In the present study, a sequence of experiments was performed to assess the influence of the key process parameters on the formation of a carbon nanofiber-coated monolith (CNFCM), using a four-level factorial design in response surface methodology (RSM). The effect of reaction temperature, hydrocarbon flow rate, catalyst and catalyst promoter were examined using RSM to enhance the formation yield of CNFs on a monolith substrate. To calculate carbon yield, a quadratic polynomial model was modified through multiple regression analysis and the best possible reaction conditions were found as follows: a reaction temperature of 800 °C, furfuryl alcohol flow of 0.08525 mL/min, ferrocene catalyst concentration of 2.21 g. According to the characterization study, the synthesized CNFs showed a high graphitization which were uniformly distributed on a monolith substrate. Besides this, the feasibility of carbon dioxide (CO ) adsorption from the gaseous mixture (N /CO ) under a range of experimental conditions was investigated at monolithic column. To get the most out of the CO capture, an as-prepared sample was post-modified using ammonia. Furthermore, a deactivation model (DM) was introduced for the purpose of studying the breakthrough curves. The CO adsorption onto CNFCM was experimentally examined under following operating conditions: a temperature of 30–50 °C, pressure of 1–2 bar, flow rate of 50–90 mL/min, and CO feed amount of 10–40 vol.%. A lower adsorption capacity and shorter breakthrough time were detected by escalating the temperature. On the other hand, the capacity for CO adsorption increased by raising the CO feed amount, feed flow rate, and operating pressure. The comparative evaluation of CO uptake over unmodified and modified CNFCM adsorbents confirmed that the introduced modification procedure caused a substantial improvement in CO adsorption.
机译：在本研究中，进行了一系列实验，以评估关键工艺参数对碳纳米纤维涂层整料（CNFCM）形成的影响，采用响应表面方法（RSM）的四级因子设计。使用RSM考察了反应温度，烃流速，催化剂和催化剂促进剂的影响，以提高整料基质上CNF的形成产率。为了计算碳收率，通过多元回归分析修改了二次多项式模型，发现最佳的反应条件如下：反应温度为800°C，糠醇流量为0.08525 mL / min，二茂铁催化剂浓度为2.21 g。根据表征研究，合成的CNF显示出高石墨化程度，并均匀分布在整料基质上。除此之外，在整体柱上研究了在一系列实验条件下从气体混合物（N / CO）中吸附二氧化碳（CO）的可行性。为了从CO捕获中获得最大收益，使用氨气对准备好的样品进行后改性。此外，为了研究突破曲线，引入了失活模型（DM）。在以下操作条件下，通过实验检查了CO在CNFCM上的吸附：温度30–50°C，压力1–2 bar，流速50-90 mL / min，CO进料量10–40 vol。％ 。通过升高温度检测到较低的吸附容量和较短的穿透时间。另一方面，通过增加CO进料量，进料流速和操作压力来增加CO的吸附能力。与未改性和改性的CNFCM吸附剂相比，CO吸收率的比较评估证实，引入的改性程序可显着改善CO吸附。

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