Sintering of platinum black in hydrogen (crystallite size and lattice strain) has been monitored by in situ X-ray diffractometry. The process was finished within 20-50 min after the temperature jump from 300 to 470…670Kwas completed, its initial rate depending on the final temperature. The effect ot hydrogen exposure was also studied. Sintering was attributed to diffusion of hydrogen into subsurface layers. A hydrogen-rich surface layer consisting mainly of interstitial hydrogen being most stable at around 570 K facilitated this process. Lattice strain relaxation may be due to the removal of subsurface oxygen.
- Catalyst sintering
- X-ray diffraction
ASJC Scopus subject areas
- Physical and Theoretical Chemistry