ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

The universality of like-disperses-like rule for supported simple metal oxide catalysts

Xianglan Xu, Zijian Qian, Dongxue Wang, Fang Liu, Jia Zhu, Xiuzhong Fang, Junwei Xu, and Xiang Wang

Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, Institute of Rare Earths, School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, China

E-mail: xuxianglan@ncu.edu.cn

Received: 10 February 2023  Accepted: 22 July 2024

Abstract:

The rutile SnO₂ monolayer dispersion capacity on the rutile TiO₂ (r-TiO₂) was obviously higher than that on the anatase TiO₂ (a-TiO₂) via the qualification of the X-ray diffraction extrapolation method, presenting a like-disperses-like rule. Combined hydrogen temperature-programmed reduction and X-ray photoelectron spectroscopy results revealed that stronger interaction occurred between the supported SnO₂ and the r-TiO₂ than and the a-TiO₂, thus resulting in higher SnO₂ dispersion on the r-TiO₂. The SnO₂/r-TiO₂ catalysts exhibited higher CO activity than the SnO₂/a-TiO₂ catalysts with the same SnO₂ loadings, verified that the supported SnO₂ and the support sharing a crystalline phase is favorable to achieve the more active dispersed component. The CeO₂ monolayer dispersion capacities on cubic c-ZrO₂ and monoclinic m-ZrO₂ supports further confirmed the universality of the like-disperses-like rule for oxide–oxide systems independent on preparation methods. By comparing a series of oxide–oxide systems, the like-disperses-like rule involved not only the crystalline phase and lattice matching, but also M–O bond characteristics of two oxides.

Graphical Abstract

Keywords: Environmental Chemistry; Monolayer dispersion capacity; Crystalline phase; Lattice matching; M–O bond; CO oxidation

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-024-03616-x

Chemical Papers 78 (13) 7573–7581 (2024)