Nano-Ru Supported on Ni Nanowires for Low-Temperature Carbon Dioxide Methanation
Tomasz Siudyga, Maciej Kapkowski, Dawid Janas, Tomasz Wasiak, Rafał Sitko, Maciej Zubko, J. Szade, Katarzyna Balin, Joanna Klimontko, Daniel Lach, Judyta Popiel, Adam Smoliński, Jarosław Polański
Abstract
In this study, we investigated the catalytic performance of Ru nanoparticles (NPs) supported on Ni-nanowires for the first time. This appears to be a highly efficient catalyst for low-temperature methanation, e.g., ca. 100% conversion and 100% of CH4 selectivity can be achieved at ca. 179 °C, while the turnover frequency (TOF) value was 2479.2 h−1. At the same time, the onset of a reaction was observed at a temperature as low as 130 °C. The comparison of nano-Pd and nano-Ru supported on Ni-nanowires enabled us to prove that oxidized surface metals are highly important for the high activity of the investigated nano-Ru@nanowired-Ni. Moreover, similar to the microscopic Sabatier rule, which indicates that some optimal reactivity level of a catalyst exists, we showed that Ni-nanowires (a higher specific surface area than a standard metal surface, e.g., in the form of a metal foam, but lower than nano-sized materials) significantly enhances the performance of the Ru-Ni catalytic system.