Partial substitution of rhodium with ruthenium in Pd-Rh nanoalloys and its impact on catalytic characteristics

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2024-08-15 DOI:10.1016/j.materresbull.2024.113051

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Abstract

In the present work, alumina-supported trimetallic Pd-Rh-Ru catalysts were synthesized and studied in comparison with the bimetallic Pd-Rh reference sample. The alloy nanoparticles were formed on the surface of the alumina support by thermolysis of the complex salts [Rh(NH₃)₅Cl][Pd(NO₂)₄] and [Rh(NH₃)₅Cl]_0.5[Ru(NH₃)₅Cl]_0.5[Pd(NO₂)₄], preliminary deposited via an incipient wet impregnation method. The influence of the conditions of the thermolysis process on the phase composition of the final products and the size of the trimetallic particles was established. Thus, nanoscale trimetallic (Rh-Ru-Pd) alloy particles of a given composition were obtained. The catalytic performance of the alumina-supported samples was examined in a CO oxidation reaction under prompt thermal aging conditions. It was ascertained that the addition of ruthenium only improves both the initial activity and thermal stability of the catalytic system. The state of each metal in the alloy nanoparticles was characterized by diffuse reflectance UV–vis spectroscopy and X-ray photoelectron spectroscopy.

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钯钌纳米合金中铑的部分替代及其对催化特性的影响

本研究合成了氧化铝支撑的 Pd-Rh-Ru 三金属催化剂，并与双金属 Pd-Rh 参考样品进行了对比研究。合金纳米颗粒是通过热解[Rh(NH3)5Cl][Pd(NO2)4]和[Rh(NH3)5Cl]0.5[Ru(NH3)5Cl]0.5[Pd(NO2)4]这两种复盐在氧化铝载体表面形成的，并通过萌发湿法浸渍初步沉积。研究确定了热解过程的条件对最终产品的相组成和三金属颗粒尺寸的影响。因此，获得了特定成分的纳米级三金属（Rh-Ru-Pd）合金颗粒。在快速热老化条件下的一氧化碳氧化反应中，考察了氧化铝支撑样品的催化性能。结果表明，钌的加入只能提高催化体系的初始活性和热稳定性。通过漫反射紫外-可见光谱和 X 射线光电子能谱对合金纳米颗粒中每种金属的状态进行了表征。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.