Kinetic and isothermal adsorption equilibrium on mercury removal by Mechanochemical elemental sulfur modified petroleum coke

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-01-25 DOI:10.1016/j.seppur.2025.131774

Yuhong Lin , Wei Zheng , Anjun Ma , Hailong Li

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Abstract

Mechanochemical elemental sulfur-modified petroleum coke (MC-ES-PC) exhibits excellent elemental mercury (Hg⁰) removal from coal-fired flue gas in previous works. However, the detailed removal process and relevant Hg⁰ uptake mechanism have not been sufficiently elucidated or discussed. In this work, kinetic and isothermal adsorption equilibria were performed to analyze the mercury mechanism of MC-ES-PC sorbents under various flue gas components at different temperatures. The results showed that chemical adsorption, external mass transfer, and intraparticle diffusion occurred during Hg⁰ immobilization, and they were dominated by chemisorption. Additionally, a gas–solid adsorption equilibrium model for the equilibrium Hg⁰ concentration and adsorption time was established based on the solid–liquid adsorption model, and adsorption equilibrium was divided into several reaction stages by time. The Langmuir and Freundlich models were found to be more suitable for describing Hg⁰ adsorption process of MC-ES-PC, which implies that Hg⁰ adsorption was primarily controlled by its oxidation. This work provides valuable insights into Hg⁰ adsorption mechanism of typical adsorbents.

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机械化学单质硫改性石油焦除汞的动力学和等温吸附平衡

机械化学单质硫改性石油焦（MC-ES-PC）在燃煤烟气中表现出较好的单质汞（Hg0）去除效果。然而，详细的去除过程和相关的Hg0吸收机制尚未得到充分的阐明和讨论。本文通过动力学和等温吸附平衡分析了MC-ES-PC吸附剂在不同温度下不同烟气组分对汞的吸附机理。结果表明：Hg0固定过程中发生了化学吸附、外传质和颗粒内扩散，且以化学吸附为主；在固液吸附模型的基础上，建立了平衡Hg0浓度与吸附时间的气固吸附平衡模型，并将吸附平衡按时间划分为多个反应阶段。Langmuir和Freundlich模型更适合描述MC-ES-PC对Hg0的吸附过程，说明Hg0的吸附主要受其氧化控制。本研究对典型吸附剂的Hg0吸附机理提供了有价值的认识。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.