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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引用次数: 0

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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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.