Effect of cerium-zirconium oxide-loaded red mud on the selective catalytic reduction of NO in downhole diesel vehicle exhaust

IF 7.3 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2025-01-13 DOI:10.1016/j.envpol.2025.125690

Wen Nie , Xinyue Song , Yun Hua , Chengyi Liu , Jie Lian , Hao Wu , Chenxi Wang

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Abstract

Red mud (RM), an iron oxide-rich solid waste, shows potential as a catalyst for selective catalytic reduction in denitrification processes. This study investigates the catalytic performance and mechanism of metal-modified RM in reducing NO from diesel vehicle exhaust. Acid-washed RM catalysts were impregnated with varying ratios of cerium (Ce) and zirconium (Zr). Our findings revealed that doping with Ce and Zr significantly enhances the denitrification activity at medium and low temperatures, highlighting the promising applicability of these elements as effective modification additives. The optimal performance was observed with a Ce:Zr loading ratio of 1:1, achieving 85% NO conversion at 250 °C. This conversion remained above 80% up to 400 °C, with a maximum of 92% NO conversion at 325 °C, thereby significantly widening the temperature window. Additionally, in-situ DRIFTS analysis revealed that the reaction process followed both the Eley-Rideal and Langmuir-Hinshelwood mechanisms.

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氧化铈-氧化锆负载赤泥对柴油汽车井下尾气中NO选择性催化还原的影响

红泥是一种富含氧化铁的固体废物，在脱硝过程中具有作为选择性催化还原催化剂的潜力。研究了金属改性RM对柴油车尾气中NO的催化性能及机理。用不同比例的铈（Ce）和锆（Zr）浸渍酸洗RM催化剂。我们的研究结果表明，Ce和Zr的掺杂显著提高了中低温下的脱氮活性，突出了这些元素作为有效改性添加剂的应用前景。Ce:Zr负载比为1:1时，在250℃条件下NO转化率达到85%。在400°C时，转化率保持在80%以上，在325°C时最高可达92%，从而显着扩大了温度窗口。此外，原位漂移分析表明，反应过程遵循Eley-Rideal和Langmuir-Hinshelwood机制。

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.