Enhanced catalytic activity and thermal stability by highly dispersed Pd-based nanocatalysts embedded in ZrO<sub>2</sub> hollow spheres

doi:10.1007/s11706-023-0649-5

Front. Mater. Sci.

2023, Vol. 17

Issue (2) : 230649 https://doi.org/10.1007/s11706-023-0649-5

RESEARCH ARTICLE

Enhanced catalytic activity and thermal stability by highly dispersed Pd-based nanocatalysts embedded in ZrO₂ hollow spheres

Tianli Liu^1,², Jian Zhang², Mingjie Xu^2,³, Chuanjin Tian¹(

), Chang-An Wang²(

)

¹. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China
². State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
³. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China

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Abstract

Sintering resistant noble metal nanoparticles are critical to the development of advanced catalysts with high activity and stability. Herein, we reported the construction of highly dispersed Pd nanoparticles loaded at the inner wall of ZrO₂ hollow spheres (Pd@HS-ZrO₂), which shows improved activity and thermal stability over references in the Pd-ZrO₂ (catalyst-support) system. Even after 800 °C high temperature calcination, the Pd nanoparticles and ZrO₂ hollow spheres did not undergo morphological changes. The Pd@HS-ZrO₂ manifests batter catalytic activity and thermal stability than the counterpart Pd/ZrO₂ catalysts. In comparison to Pd/ZrO₂-800, Pd@ZrO₂-800 exhibits a 25°C reduction in the temperature required for complete conversion of CO. The enhanced catalytic activity and thermal stability of Pd@HS-ZrO₂ can be attributed to the nanoconfinement effect offered by the 10 nm wall thickness of the ZrO₂ hollow spheres, which suppresses the coarsening of the Pd nanoparticles (active center for catalysis).

Keywords catalysis nanoparticles coarsening thermal stability

Corresponding Author(s): Chuanjin Tian,Chang-An Wang

Issue Date: 26 May 2023

Cite this article:

Tianli Liu,Jian Zhang,Mingjie Xu, et al. Enhanced catalytic activity and thermal stability by highly dispersed Pd-based nanocatalysts embedded in ZrO₂ hollow spheres[J]. Front. Mater. Sci., 2023, 17(2): 230649.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-023-0649-5
https://academic.hep.com.cn/foms/EN/Y2023/V17/I2/230649

Fig.1 Schematic diagram of the synthesis process of Pd@HS-ZrO₂ hollow sphere.

Fig.2 SEM images of (a) CS, (c) CS@Pd@ZrO₂, (d) Pd@HS-ZrO₂-450, (e) Pd@HS-ZrO₂-700, and (f) Pd@HS-ZrO₂-800. (b) TEM image of CS@Pd.

Fig.3 TEM images, element mapping images, and EDS spectrum of Pd@HS-ZrO₂-450 hollow spheres.

Fig.4 XRD patterns of Pd@HS-ZrO₂ samples calcined at 450, 700, 800, and 900 °C.

Fig.5 XPS spectra of Pd 3d + Zr 3p of Pd@HS-ZrO₂ samples calcined at (a) 450 °C, (b) 700 °C, (c) 800 °C, and (d) 900 °C.

Fig.6 (a) CO conversion curves of samples (Pd@HS-ZrO₂-450, Pd@HS-ZrO₂-700, Pd@HS-ZrO₂-800, Pd@HS-ZrO₂-900, Pd/ZrO₂-450, and Pd/ZrO₂-800). (b) Cycle test of Pd@HS-ZrO₂-800. (c) Catalytic stability test of the Pd@HS-ZrO₂-800 catalyst. (d) Apparent activation energies of Pd@HS-ZrO₂ samples.

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