Effect of cation–oligomer interactions on the size and reducibility of NiO particles on NiRu/SiO2 catalysts

• DOI: 10.1039/c1jm13029c
• Publication Date: 2011-10-01T08:30:42Z
• Authors: Nan Yao; Huafeng Ma; Yan Shao; Changkun Yuan; Deyi Lv; Xiaonian Li
• Keywords: Non-blocking I/O; Methanation; Oligomer

A NiRu/SiO2 catalyst was prepared by a new method. The presence of polyethylene glycol (PEG) molecules allows their oligomer groups to interact with the metallic ions in liquid, which creates small NiO particles (∼6 nm) that closely contact RuO2 particles, while PEG-free process forms large (∼11 separated on SiO2 after calcination air. formation close contacts between and improves promotional efficiency Ru. Therefore, can be reduced at lower temperature than SiO2, finding contrasts dispersion–reducibility dependence inherent oxide-supported nickel-based catalyst. This leads smaller Ni PEG-additive-derived NiRu/SiO2-CP catalyst, contrast NiRu/SiO2-C (∼28 process. In methanation reaction, NiRu/SiO2–CP has initial turnover frequency (TOF) per mole surface Ni, however, it shows better long-term stability. Instead, as result, higher TOF reaction for 30 h deactivates due deposition less reactive carbon species.