Reversibility of the Ex‐Solution↔Redispersion Processes of Rhodium in Rh0.15Ce0.85O2‐y Nanoparticles Deposited on Functionalized Alumina,ChemNanoMat

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Reversibility of the Ex‐Solution↔Redispersion Processes of Rhodium in Rh0.15Ce0.85O2‐y Nanoparticles Deposited on Functionalized Alumina
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-05-12 , DOI: 10.1002/cnma.202000062
Karolina A. Ledwa ₁ , Leszek Kępiński ₁ , Mirosława Pawlyta ₂

Affiliation

Uniform, highly dispersed (<5 nm) Rh_0.15Ce_0.85O_2‐y nanoparticles deposited on the alumina support functionalized with alkylsilane were obtained in this work and studied in detail, to characterize their basic properties and thermal stability in the oxidizing and reducing atmosphere. In the next step, the possibility to perform the reversible ex‐solution of Rh nanoparticles in the reducing environment (500 °C, H₂), and its redispersion into the cerium oxide structure in the oxidizing environment (400 °C, air) was studied with the use of a wide range of experimental methods (XRD, Raman spectroscopy, STEM‐HAADF/EDS, H₂‐TPR/TPO, XPS). Good reduction‐oxidation reversibility of the metal ions in ceria nanoparticles was proved, with no increase of the nanoparticles’ size. In the reducing atmosphere, small particles of reduced rhodium were formed, and these particles disappeared in the oxidizing environment. Also, the number of oxygen vacancies significantly changed depending on the treatment.

中文翻译：

铑在功能化氧化铝上沉积的Rh0.15Ce0.85O2-y纳米粒子中Ex溶液的再分散过程可逆性

在这项工作中获得并进行了详细研究，以沉积在氧化铝载体上的均匀，高度分散（<5 nm）的Rh _0.15 Ce _0.85 O _{2 -y}纳米颗粒，以表征其基本性质和在氧化和还原气氛中的热稳定性。。在下一步中，可以在还原环境（500°C，H ₂）中对Rh纳米粒子进行可逆的固溶，然后在氧化环境（400°C，空气）中将其重新分散到氧化铈结构中。使用多种实验方法（XRD，拉曼光谱，STEM-HAADF / EDS，H ₂-TPR / TPO，XPS）。氧化铈纳米粒子中的金属离子具有良好的还原-氧化可逆性，且纳米粒子的尺寸没有增加。在还原气氛中，形成还原铑的小颗粒，这些颗粒在氧化环境中消失。而且，氧空位的数量根据治疗而显着改变。

更新日期：2020-05-12

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