کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6454639 | 1418814 | 2017 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Oxide passivated Ni-supported Ru nanoparticles in silica: A new catalyst for low-temperature carbon dioxide methanation Oxide passivated Ni-supported Ru nanoparticles in silica: A new catalyst for low-temperature carbon dioxide methanation](/preview/png/6454639.png)
- The non-alloyed Ni supported nano-Ru(Re, Rh, Ir or Pd) catalysts were synthesized.
- Nano-Ru/Ni forms oxide passivated Ni-supported Ru nanoparticles.
- Nano-Ru/Ni is highly efficient and selective catalyst of CO2 methanation at 200 °C.
- Nano-Re/Ni is highly efficient and selective catalyst of the highest TOF at 460 °C.
We tested the catalytic performance of Ni-supported Ru nanoparticles in silica for the first time. The method for supporting Ru nanoparticles on Ni included the formation of nano-Ru/nano-SiO2, from which silica was digested in the presence of Ni. This provided a nano-Ru/Ni catalyst with an oxide passivation layer on the surface in which unalloyed metallic Ru and Ni were detected. This system, which was tested as a potential methanation catalyst, appears to be highly productive and efficient at low temperature, e.g. ca. 100% conversion can be achieved at ca. 200 °C at a high TOF value of 940 hâ1. The longer reaction duration deactivated the catalyst by carbon deposition; however, it did not destroy the catalyst, which could be fully reactivated by hydrogen treatment. In turn, the highest methane productivity (among nano-Re, Rh, Ir or Pd/Ni) given by TOF value of ca. 13855 hâ1 at higher temperature (460 °C) was observed for the nano-Re/Ni catalyst.
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Journal: Applied Catalysis B: Environmental - Volume 206, 5 June 2017, Pages 16-23