CO hydrogenation over RhVO4 catalyst on SiO2 support (RhVO4/SiO2) was studied after H2 reduction at 573 K. RhVO4 catalyst was formed on the silica support by calcinations in air at 973 K with an atomic ratio of V/Rh = 1:1. RhVO4 was decomposed to Rh metal particles and highly dispersed V oxide particles by H2 reduction, and a strong metal-oxide (Rh-vanadium oxide) interaction was induced. The RhVO4/SiO2 catalyst after H2 reduction showed higher activity and selectivity for C2 oxygenates in CO hydrogenation, compared with unpromoted RhVO4/SiO2 catalyst. The activity of the RhVO4/SiO2 catalyst decreased after intentional deactivation treatment. Temperature programmed oxidation of the deactivated RhVO4/SiO2 catalyst resulted in formation of CO2. Therefore, the deactivation was probably due to carbon deposition. RhVO4 on SiO2 support was regenerated by recalcination in O2 at 873 K, and the activity and selectivity for C2 oxygenates were restored.
|Number of pages||5|
|Journal||Sekiyu Gakkaishi (Journal of the Japan Petroleum Institute)|
|Publication status||Published - 2002 Jul|
- Carbon deposition
- Carbon monoxide
- Rhodium mixed oxide