Crystal-phase-dependent metal-support interaction in Ru/TiO2 catalysts for low-temperature oxidation

IF 10.7 Q1 CHEMISTRY, PHYSICAL

Chem Catalysis Pub Date : 2026-04-14 DOI:10.1016/j.checat.2026.101712

Wei Tan, Xiaoyang Zhu, Yirui Yang, Bifeng Zhang, Xuan Tang, Xiaoyu Li, Kailong Ye, Shaohua Xie, Yanhui Ao, Fudong Liu, Lin Dong

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Abstract

Understanding crystal-phase effects in oxide-supported metal catalysts is critical for designing efficient oxidation catalysts. Here, Ru catalysts supported on anatase and rutile titanium oxide (TiO₂) were evaluated for the low-temperature catalytic oxidation of representative air pollutants, including propane (C₃H₈), propylene (C₃H₆), carbon monoxide (CO), and ammonia (NH₃). Rutile TiO₂ significantly enhances oxidation activity over anatase TiO₂ across all probe molecules. Systematic characterizations reveal that lattice matching between RuO₂ and rutile TiO₂ strengthens the metal-support interaction, promoting high dispersion of Ru species and stabilizing active sites. The highly dispersed Ru species on rutile TiO₂ exhibit superior low-temperature redox properties, directly correlating with enhanced catalytic oxidation performance. In contrast, weaker interaction on anatase TiO₂ results in lower dispersion and reduced activity. These results establish crystal-phase-dependent metal-support interactions as a key factor governing low-temperature oxidation in Ru/TiO₂ catalysts and provide guidance for designing oxide-supported noble metal catalysts for air pollutant abatement.

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Ru/TiO2低温氧化催化剂中晶体相依赖的金属-载体相互作用

了解氧化物负载金属催化剂的晶相效应是设计高效氧化催化剂的关键。本文研究了锐钛矿和金红石型氧化钛（TiO2）负载Ru催化剂对丙烷（C3H8）、丙烯（C3H6）、一氧化碳（CO）和氨（NH3）等典型空气污染物的低温催化氧化性能。金红石型TiO2在所有探针分子上显著增强锐钛矿型TiO2的氧化活性。系统表征表明，RuO2与金红石型TiO2之间的晶格匹配增强了金属-载体相互作用，促进了Ru的高度分散和活性位点的稳定。高度分散的Ru在金红石型TiO2上表现出优异的低温氧化还原性能，与增强的催化氧化性能直接相关。相反，与锐钛矿TiO2的相互作用较弱，导致分散性降低，活性降低。这些结果确定了晶体相依赖的金属负载相互作用是Ru/TiO2催化剂低温氧化的关键因素，并为设计用于空气污染物减排的氧化物负载贵金属催化剂提供了指导。

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来源期刊

Chem Catalysis

CiteScore

10.50

自引率

6.40%

发文量

期刊介绍： Chem Catalysis is a monthly journal that publishes innovative research on fundamental and applied catalysis, providing a platform for researchers across chemistry, chemical engineering, and related fields. It serves as a premier resource for scientists and engineers in academia and industry, covering heterogeneous, homogeneous, and biocatalysis. Emphasizing transformative methods and technologies, the journal aims to advance understanding, introduce novel catalysts, and connect fundamental insights to real-world applications for societal benefit.