Effect of CaCO3 on the Phase Evolution in Simultaneous Removal of SO2 and NO2 by Calcium Hydroxide

IF 5.2 3区工程技术 Q2 ENERGY & FUELS

Energy & Fuels Pub Date : 2025-03-14 DOI:10.1021/acs.energyfuels.4c0631810.1021/acs.energyfuels.4c06318

Bin Zhou, Xinqing Zou, Guoqiang Gao, Jianguo Hong, Tiehua Cao, Shuhua Geng*, Yuwen Zhang* and Xionggang Lu,

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引用次数: 0

Abstract

This study mainly focuses on investigating the effect of in situ-generated CaCO₃ on simultaneous SO₂ and NO₂ removal, clarifying the competitive mechanism of CO₂, SO₂, and NO₂ with absorbent Ca(OH)₂ in the removal process. The experiments were carried out by the precarbonated absorbent, whose contents were mainly Ca(OH)₂ and CaCO₃. The results of the DFT calculation showed that the molecular adsorption energies of CO₂, NO₂, and SO₂ on the surface of Ca(OH)₂ were −3.42, −1.28, and −1.16 eV, respectively, and the adsorption order on the surface of Ca(OH)₂ was CO₂ > NO₂ > SO₂ under the sintering flue gas condition. The phase evolution was elucidated by morphology and composition analysis of the removal products. In the process of simultaneous removal of SO₂ and NO₂, CO₂ first reacted with absorbent Ca(OH)₂ to reach equilibrium. The generated CaCO₃ covered the surface of the absorbent, which weakens the activity of the absorbent. At the later stage of the removal process, the activity of Ca(OH)₂ decreased. The in situ-generated CaCO₃ participated in SO₂ and NO₂ removal reactions, while the removal effect was lower than that of Ca(OH)₂.

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来源期刊

Energy & Fuels 工程技术-工程：化工

CiteScore

9.20

自引率

13.20%

发文量

1101

审稿时长

2.1 months

期刊介绍： Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.