DE-NOx/CO Performance According to Ag Loading Amount and Support Type of H2-SCR

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-04-15 DOI:10.1007/s12239-024-00088-6

Choong-kil Seo

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Abstract

This study aims to investigate the NOx/CO reduction characteristics of harmful gases according to the loading amount of active Ag, which plays the most important role in H₂-SCR, and the type of support. H₂-SCR with Ag loaded on support of TiO₂ was reduced to Ag⁺ at about 140 °C in AgO oxide, and H₂-SCR with Ag loaded on support of Al₂O₃ was reduced to Ag clusters (Ag_n^δ+) at about 260 °C in AgO oxide. Because it is more unstable than AgO oxide, it promoted the chemical reaction of Ag. 0.5Ag/TiO₂ H₂-SCR showed the highest NOx conversion rate of about 18% at 200 °C, and the window width was also widened. 2Ag/Al₂O₃ H₂-SCR improved the low-temperature activity of the catalyst due to its large specific surface area and the loading amount of active catalyst Ag. Although the harmful gas reduction performance has decreased significantly compared to the active material Pt used in the H₂-SCR, research on active materials considering the performance the improvement and economic feasibility must be continued.

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根据 H2-SCR 的含银量和支持类型确定 DE-NOx/CO 性能

本研究旨在根据在 H2-SCR 中起最重要作用的活性银的负载量和支持物的类型，研究有害气体的 NOx/CO 还原特性。以 TiO2 为载体的 H2-SCR 在氧化 AgO 中约 140 ℃ 时被还原成 Ag+，而以 Al2O3 为载体的 H2-SCR 在氧化 AgO 中约 260 ℃ 时被还原成 Ag 簇（Agnδ+）。由于 Al2O3 比氧化 AgO 更不稳定，它促进了 Ag 的化学反应。0.5Ag/TiO2 H2-SCR 在 200 ℃ 时的氮氧化物转化率最高，约为 18%，窗口宽度也有所扩大。2Ag/Al2O3 H2-SCR 由于具有较大的比表面积和活性催化剂 Ag 的负载量，提高了催化剂的低温活性。虽然与 H2-SCR 中使用的活性材料铂相比，有害气体还原性能明显下降，但考虑到性能改善和经济可行性，活性材料的研究仍需继续。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.