CaO-Enhanced Hematite Oxygen Carrier for the Study of the Characteristics of Flour Chemical Looping Gasification

IF 3.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Industrial & Engineering Chemistry Research Pub Date : 2025-03-24 DOI:10.1021/acs.iecr.4c0467310.1021/acs.iecr.4c04673

Shanchen Li, Fanrui Meng*, Xianchun Li*, Qianqian Qiu and Yichen Tang,

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Abstract

This study synthesized Ca-modified hematite oxygen carriers (OCs) via the impregnation method and investigated their performance in the chemical looping gasification of flour at 900 °C. The results indicated that CaO modification led to the formation of Ca₂Fe₂O₅ in the oxygen carriers. When the hematite/CaO mass ratio was optimized to 4:1, the proportion of combustible gases in the product gas reached 50%. With the increase in the flour-to-oxygen carrier mass ratio, the CO₂ yield rose, while the quality of combustible gases declined. The increase of water content in flour will increase the yield and quality of gas components. Quantum chemical calculations revealed that H₂ exhibits stronger adsorption at Fe sites on Ca₂Fe₂O₅ (001) than on Fe₂O₃ (001), confirming that CaO-modified hematite enhances the oxygen carrier activity. H₂ dissociation on Ca₂Fe₂O₅ forms Fe–H and O–H bonds, promoting the formation of Fe and H₂O alongside surface oxygen dissociation.

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草料增强赤铁矿氧载体对面粉化学环化气化特性的研究

采用浸渍法制备了钙改性赤铁矿氧载体（OCs），并考察了其在900℃下对面粉进行化学环气化的性能。结果表明，CaO修饰导致氧载体中形成Ca2Fe2O5。当赤铁矿/CaO质量比优化为4:1时，产品气体中可燃气体的比例达到50%。随着粉氧载流子质量比的增大，CO2产率升高，可燃气体质量下降。面粉中水分含量的增加会提高气体组分的产率和质量。量子化学计算表明，H2在Ca2Fe2O5（001）上的吸附比在Fe2O3（001）上的吸附更强，证实了cao修饰的赤铁矿增强了载氧活性。H2在Ca2Fe2O5上解离形成Fe - h和O-H键，促进Fe和H2O在表面氧解离的同时生成。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Industrial & Engineering Chemistry Research 工程技术-工程：化工

CiteScore

7.40

自引率

7.10%

发文量

1467

审稿时长

2.8 months

期刊介绍： ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.