Kinetics of CO hydrogénation over Ni-Mo/Al2O3 catalysts with and without K promotion
Industrial and Engineering Chemistry Research, cilt.37, sa.6, ss.2397-2403, 1998 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 37 Sayı: 6
- Basım Tarihi: 1998
- Doi Numarası: 10.1021/ie970467r
- Dergi Adı: Industrial and Engineering Chemistry Research
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.2397-2403
- Boğaziçi Üniversitesi Adresli: Evet
Özet
The effect of K promotion on the CO hydrogenation activity and C2-C4 hydrocarbons selectivity of the 15 wt % Ni-10 wt % Mo/Al2O3 catalyst was investigated in the 498-548 K range using unpromoted and 1-3 wt % K-promoted samples. CO2 methanation tests at 523 K were used as a probe to confirm activity trends. Intrinsic kinetic data were obtained in the initial rate region on both unpromoted and 1 wt % K-promoted Ni-Mo catalysts. K promotion of the bimetallic Ni-Mo catalyst decreases both the activity and the specific activity of the Ni sites while increasing the C2-C3 olefin-to-paraffin ratio. The surface carbide mechanism with dissociative adsorption of hydrogen as the rate-limiting step gives the most plausible kinetic model among the models tested for both Ni-Mo and Ni-Mo-K catalysts. © 1998 American Chemical Society.