Shi Quanquan, Li Zhiwen, Cao Changhai, Li Gao, Barkaoui Sami
College of Science, Inner Mongolia Agricultural University Hohhot 010018 China
Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resource & Key Laboratory of Agricultural Ecological Securi-ty and Green Development at Universities of Inner Mongolia Autonomous Hohhot 010018 China.
Nanoscale Adv. 2023 Sep 5;5(19):5385-5389. doi: 10.1039/d3na00561e. eCollection 2023 Sep 26.
In this study, gold nanoparticles were dispersed on CoO nanoplates, forming a specific Au-CoO interface. Upon calcination at 300 °C in air, aberration-corrected STEM images evidenced that the gold nanoclusters (NCs) on CoO{111} were maintained at 2.2 nm, which is similar to the size of the parent Au colloidal particles, demonstrating the stronger metal-support interaction (SMSI) on CoO{111}. Au/CoO{111} showed good catalytic activity (a full CO conversion achieved at 80 °C) and durability (over 10 hours) in CO oxidation, which was mainly due to the promotion by the surface oxygen vacancies and intrinsic defects of CoO{111} for activating O and by Au, Au, and Au species on the surface of gold NCs for CO activation, as evidenced by Raman and Fourier-transform infrared (FT-IR) spectroscopy analysis. Au/CoO catalyzed CO oxidation obeyed the Langmuir-Hinshelwood mechanism at low temperatures.
在本研究中，金纳米颗粒分散在CoO纳米片上，形成了特定的Au-CoO界面。在空气中300°C煅烧后，像差校正扫描透射电子显微镜（STEM）图像表明，CoO{111}上的金纳米团簇（NCs）保持在2.2 nm，这与原始金胶体颗粒的尺寸相似，表明在CoO{111}上存在更强的金属-载体相互作用（SMSI）。Au/CoO{111}在CO氧化反应中表现出良好的催化活性（80°C时实现CO完全转化）和耐久性（超过10小时），这主要归因于CoO{111}的表面氧空位和固有缺陷对O的活化促进作用，以及金纳米颗粒表面的Au、Au和Au物种对CO的活化作用，拉曼光谱和傅里叶变换红外（FT-IR）光谱分析证明了这一点。Au/CoO催化的CO氧化在低温下遵循朗缪尔-欣谢尔伍德机理。
