Effect of the Supported Metal Species on Soot Oxidation over PGM/CeO2–ZrO2

IF 3.3 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Bulletin of the Chemical Society of Japan Pub Date : 2024-09-11 DOI:10.1093/bulcsj/uoae092

Hitoshi Kubo, Yusuke Ohshima, Shunsuke Kato, Noriyuki Saitoh, Noriko Yoshizawa, Osamu Nakagoe, Shuji Tanabe

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Abstract

The soot oxidation over platinum group metal oxide/CeO2–ZrO2 (PGM/CZ) catalysts with different ability to capture gas-phase oxygen has been studied herein. The ability to capture gas-phase oxygen was in sequence of Ru/CZ > Rh/CZ > Ir/CZ > Pt/CZ > Pd/CZ. Soot oxidation test by TG-DTA showed that Ru/CZ, Rh/CZ, and Ir/CZ are highly active catalysts. It was found that there is a good correlation between the ability to capture gas-phase oxygen and soot oxidation activity. TEM observation revealed that soot oxidation mainly occurs at the interface between soot and CZ surface. The Ea values and soot oxidation test using labeled oxygen suggested that highly active catalysts oxidize soot by CZ lattice oxygen. For Ir/CZ, soot oxidation at 270°C occurred due to the reduction by soot. Ru/CZ and Rh/CZ captured gas-phase oxygen spontaneously below 250°C, resulting in soot oxidation at 270°C. H2-TPR results suggested that the reactivity of lattice oxygen in CZ surface improved by PGM is also related to soot oxidation activity. It was suggested that the ability to capture gas-phase oxygen and the reactivity of lattice oxygen in CZ surface determine the soot oxidation activity, and that Ru, Rh, and Ir have the effect of enhancing these properties.

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支撑金属物种对 PGM/CeO2-ZrO2 氧化烟尘的影响

本文研究了具有不同气相氧捕获能力的铂族金属氧化物/CeO2-ZrO2（PGM/CZ）催化剂的烟尘氧化过程。气相氧捕获能力依次为 Ru/CZ > Rh/CZ > Ir/CZ > Pt/CZ > Pd/CZ。TG-DTA 烟尘氧化试验表明，Ru/CZ、Rh/CZ 和 Ir/CZ 是高活性催化剂。研究发现，气相氧捕获能力与烟尘氧化活性之间存在良好的相关性。TEM 观察表明，烟尘氧化主要发生在烟尘与 CZ 表面的界面上。Ea 值和使用标记氧进行的烟尘氧化测试表明，高活性催化剂通过 CZ 晶格氧氧化烟尘。对于 Ir/CZ，由于烟尘的还原作用，在 270°C 时发生了烟尘氧化。Ru/CZ 和 Rh/CZ 在低于 250°C 时自发捕获气相氧，从而在 270°C 时发生烟尘氧化。H2-TPR 结果表明，经 PGM 改进的 CZ 表面晶格氧的反应活性也与烟尘氧化活性有关。研究表明，CZ 表面捕获气相氧的能力和晶格氧的反应性决定了烟尘氧化活性，而 Ru、Rh 和 Ir 具有增强这些特性的作用。

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来源期刊

Bulletin of the Chemical Society of Japan 化学-化学综合

CiteScore

6.40

自引率

5.00%

发文量

194

审稿时长

3-8 weeks

期刊介绍： The Bulletin of the Chemical Society of Japan (BCSJ) is devoted to the publication of scientific research papers in the fields of Theoretical and Physical Chemistry, Analytical and Inorganic Chemistry, Organic and Biological Chemistry, and Applied and Materials Chemistry. BCSJ appears as a monthly journal online and in advance with three kinds of papers (Accounts, Articles, and Short Articles) describing original research. The purpose of BCSJ is to select and publish the most important papers with the broadest significance to the chemistry community in general. The Chemical Society of Japan hopes all visitors will notice the usefulness of our journal and the abundance of topics, and welcomes more submissions from scientists all over the world.