An experimental investigation on adsorptive desulfurization for model diesel fuels (MDFs) is described using graphene nanoplatelets (GNPs) as an adsorbent. Batch experiments for a single component as well as a multicomponent system were conducted. The single-component adsorption isothermal experimental results for the batch process were well represented by the Freundlich isotherm (thiophene (T), 2-methylthiophene (2-MT)) and the Langmuir isotherm (dibenzothiophene (DBT)) models. The adsorption process kinetics fits with the pseudo-second-order model for T, 2-MT, and DBT on GNPs. Both surface and pore diffusions controlled the sorption process. A process design of a single-stage batch-adsorber for the adsorption of T, 2-MT, and DBT onto GNPs was also studied using the calculated adsorption isotherm parameters. In addition, a fixed-bed adsorber was used for studying the continuous system at ambient conditions for multicomponent MDFs. The main objective of continuous studies was to investigate the process variables’ effect on the desulfurization. The effect of flow rate, bed height, and initial sulfur concentration on the adsorptive capacity of the adsorbent for T, 2-MT, and DBT were evaluated. The breakthrough time and adsorptive capacity increased with increasing the bed height and decreasing the flow rate and initial sulfur concentration. For continuous studies, more than 90% of the bed was saturated for all thio-compounds within 100 min for the feed flow rate of 3 mL/min and adsorbent weight of 3 g. The Adam–Bohart model was used to check the performance of the adsorption breakthrough curves. The Adam–Bohart model rate constant and adsorption capacity were found to be 0.006 (mg/kg)⁻¹ h^–1 and 117.21 mg S/kg, respectively.

中文翻译：

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使用石墨烯纳米片的柴油机燃料间歇和连续吸附脱硫

描述了使用石墨烯纳米片（GNP）作为吸附剂对模型柴油（MDF）进行吸附脱硫的实验研究。进行了单组分以及多组分系统的批量实验。间歇过程的单组分吸附等温实验结果很好地表示为Freundlich等温线（噻吩（T），2-甲基噻吩（2-MT））和Langmuir等温线（二苯并噻吩（DBT））模型。吸附过程动力学符合GNP上T，2-MT和DBT的拟二级模型。表面和孔的扩散都控制了吸附过程。还使用计算出的吸附等温线参数研究了用于T，2-MT和DBT吸附到GNP上的单级间歇式吸附器的工艺设计。此外，固定床吸附器用于研究多组分MDF在环境条件下的连续系统。连续研究的主要目的是研究工艺变量对脱硫的影响。评估了流速，床高和初始硫浓度对吸附剂对T，2-MT和DBT吸附能力的影响。穿透时间和吸附能力随着床层高度的增加以及流速和初始硫浓度的降低而增加。对于连续研究，进料流速为3 mL / min，吸附剂重量为3 g时，在100分钟内所有硫代化合物都将90％以上的床饱和。Adam–Bohart模型用于检查吸附突破曲线的性能。^-1 h ^–1和117.21 mg S / kg。