An Anomalous Effect of Silica on the Reduction of Nickel Nanoparticles
Russian Journal of Physical Chemistry A
, E-ISSN: 1531-863X
Boreskov Institute of Catalysis SB RAS
The reduction of nickel-silica systems synthesized by the heterophase sot-gel method was studied over the entire concentration range. It was found that, as the silica content of the system is increased from 0 to 34 wt %, the reduction temperature increases, whereas the average size of nickel crystallites decreases from 44 to 5-6 nm. However, a further increase in the silica content produced an unexpected result: the reduction temperature decreased, whereas the average size of nickel crystallites increased to 15 nm.