Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
Langmuir. 2013 Jun 11;29(23):7125-33. doi: 10.1021/la401460c. Epub 2013 May 31.
Pd nanoparticles (NPs) were successfully obtained by the reduction of PdCl2 with L-ascorbic acid, whose morphology was revealed by HRTEM to be a worm-like system, formed by linked crystallite clusters with an average short-axis diameter of 5.42 nm. In situ UV-vis absorption measurements were used to monitor their formation, while XPS and XRD characterization confirmed the NPs' metallic state. A straightforward way to support the obtained Pd NPs on activated carbon (AC) was used to prepare a catalyst for NO decomposition reaction. The Pd/AC catalysts proved to be highly active in the temperature range of 323 to 673 K, and a redox mechanism is proposed, where the catalyst's active sites are oxidized by NO and reduced by carbon, emitting CO2 and enhancing their capacity to absorb and dissociate NO.
钯纳米粒子（NPs）通过 L-抗坏血酸还原 PdCl2 成功获得，其形态通过高分辨透射电子显微镜（HRTEM）揭示为一种蠕虫状系统，由连接的微晶簇组成，平均短轴直径为 5.42nm。原位紫外-可见吸收测量用于监测其形成，而 X 射线光电子能谱（XPS）和 X 射线衍射（XRD）表征证实了 NPs 的金属态。一种简单的方法是将获得的 Pd NPs 负载在活性炭（AC）上，以制备用于 NO 分解反应的催化剂。Pd/AC 催化剂在 323 至 673 K 的温度范围内表现出高活性，并提出了一种氧化还原机制，其中催化剂的活性位点被 NO 氧化，被碳还原，释放出 CO2 并增强其吸收和解离 NO 的能力。
