Abstract

Asphaltenes are one of the heaviest fractions of crude oil, which causes it to settle and deposit into the reservoir rock or extraction and transfer pipes. So far, various methods have been proposed to separate or remove asphaltenes, and among them, the adsorption of asphaltenes using nanoparticles is one of the most efficient method. In this way, two strong, durable, and recyclable adsorbents towards adsorption of asphaltenes from crude oil were synthesized by incorporation of Fe₃O₄ and fibrous silica (KCC-1) nanoparticles (NPs) into ZSM-5 zeolite nanocrystals. Structural, physical and surface characteristic properties of the adsorbents were studied by FTIR, XRD, VSM, BET, FE-SEM, and TEM analyses. In order to optimize the asphaltenes adsorption process, the effect of some parameters such as asphaltenes concentration, temperature and the amounts of adsorbents was studied. The asphaltenes adsorption isotherms were suitably correlated to the Langmuir model for ZSM-5/Fe₃O₄ as well as ZSM-5/KCC-1 nanoparticles, which suggests the monolayer adsorption of asphaltenes onto the nanoparticles through a self-association as assumed in the literature. Kinetic results showed that asphaltenes is rapidly adsorbed by the nanoparticles within about 2 h. By comparing the quasi-first-order and quasi-second-order kinetic models, it was found that the quasi-second-order kinetic model well predicts the adsorption kinetic of the asphaltenes on each of the ZSM-5/ Fe₃O₄ and ZSM-5/ KCC-1 nanoparticles.

中文翻译：

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ZSM-5/Fe3O4 和 ZSM-5/纤维状纤维素作为两种耐用且可回收的吸附剂，用于有效去除原油中的沥青质

摘要

沥青质是原油中最重的部分之一，它会使其沉降并沉积到储层岩石或开采和输送管道中。迄今为止，已经提出了多种分离或去除沥青质的方法，其中，使用纳米颗粒吸附沥青质是最有效的方法之一。_{通过这种方式，通过掺入 Fe 3} O ₄合成了两种用于吸附原油中沥青质的坚固、耐用和可回收的吸附剂和纤维二氧化硅 (KCC-1) 纳米粒子 (NPs) 成 ZSM-5 沸石纳米晶体。通过FTIR、XRD、VSM、BET、FE-SEM和TEM分析研究了吸附剂的结构、物理和表面特性。为优化沥青质吸附过程，研究了沥青质浓度、温度和吸附剂用量等参数对沥青质吸附过程的影响。沥青质吸附等温线与 ZSM-5/Fe ₃ O _{4的 Langmuir 模型适当相关}以及 ZSM-5/KCC-1 纳米颗粒，这表明沥青质通过文献中假设的自缔合单层吸附到纳米颗粒上。动力学结果表明，沥青质在约 2 小时内被纳米颗粒快速吸附。通过比较准一级和准二级动力学模型发现，准二级动力学模型很好地预测了沥青质在ZSM-5/ Fe ₃ O ₄上的吸附动力学和ZSM-5/ KCC-1 纳米粒子。