Youwei Song , Liyun Zhang , Ying Zhang , Yongzhao Wang , Zhuang Xu , Bingsen Zhang
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引用次数: 0
Abstract
The catalytic oxidation of carbon monoxide (CO) to carbon dioxide (CO2) is an effective way to eliminate the harmful effects of CO, with catalysts playing a crucial role in this process. Although Pt-based catalysts have been widely used for CO oxidation, the low-temperature activity and thermal stability still need to be improved. In this study, a Pt/ZnO@SiO2 composite structure was constructed by coating Pt/ZnO catalysts with a thin SiO2 layer. The influence of SiO2 overcoating layer on the sintering behavior of Pt nanoparticles (NPs) and on the catalytic performance of the Pt catalyst for CO oxidation was investigated in detail. And the results were compared with those without SiO2 overcoating layer. Investigations found that the SiO2 coating layer effectively inhibited the sintering of Pt NPs at high temperatures, enhancing the thermal stability. In addition, the SiO2 overcoating layer improved the catalytic activity of the Pt-based catalyst by inducing higher concentration of oxygen vacancies on the catalyst surface as well as weakening the CO adsorption, which could enhance the adsorption and activation ability of oxygen. Meanwhile, the presence of SiO2 overcoating layer improved the catalytic stability during CO oxidation reaction. This work provides an important reference for the design and development of supported Pt-based catalysts with excellent thermal stability and catalytic activity for CO oxidation.
期刊介绍：
The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles.
Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors.
Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology.
Key topics concerning the creation and processing of particulates include:
-Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales
-Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes
-Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc.
-Experimental and computational methods for visualization and analysis of particulate system.
These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.
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