CO在分散在ZnO纳米棒和纳米金字塔上的Pt纳米颗粒上的氧化

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-04-10 DOI:10.1016/j.apcata.2025.120265

Mina Lotfi , Abouelhassan A. Gomaa , Ammara Ghafoor , Andreas Goldbach , Wenjie Shen

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引用次数: 0

摘要

Pt和ZnO的结合产生了高活性的CO氧化催化剂，但很少被研究。我们通过在非极性ZnO纳米棒和锌极性ZnO纳米锥体表面沉积~ 1.6 nm和~ 3.2 nm的Pt颗粒，研究了ZnO表面性质对氧化活性的影响。在o2贫氧化条件下，Pt颗粒尺寸的减小使CO转化率提高到200 %，而从纳米金字塔形态切换到纳米棒状ZnO形态只会使氧化率提高20 - 40% %。根据DRIFTS的分析，氧化锌的表面效应可以归因于纳米棒催化剂上额外的Pt位点，使CO活化更强。在富含O2的反应混合物中，Pt粒度效应的衰减表明，这是因为在较小的颗粒上有更多的Pt位点可供O2活化。因此，通过优化Pt/ZnO催化剂的纳米结构设计可以显著提高CO在Pt/ZnO催化剂上的转化率。

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CO oxidation over Pt nanoparticles dispersed over ZnO nanorods and nanopyramids

The combination of Pt with ZnO yields highly active albeit rarely studied CO oxidation catalysts. We investigated the influence of ZnO surface character on oxidation activity by depositing ∼1.6 nm and ∼3.2 nm Pt particles on nonpolar ZnO nanorod and Zn-polar ZnO nanopyramid surfaces. Pt particle size reduction enhances CO conversion rates up to 200 % under O₂-lean oxidation conditions whereas a switch from the nanopyramid to nanorod ZnO morphology leads only to 20–40 % higher oxidation rates. According to DRIFTS analyses the ZnO surface effect can be ascribed to additional Pt sites on the nanorod catalysts that enable stronger CO activation. The attenuation of the Pt particle size effect in O₂-rich reaction mixtures suggests that it originates from the availability of more Pt sites for O₂ activation on smaller particles. Thus, CO conversion rates over Pt/ZnO catalysts can be markedly improved by optimizing their nanostructural design.

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.