II International Symposium on Carbon for Catalysis ABSTRACTS

PP-<strong>II</strong>-21
Pt /AC and 0.25% SnO x – 1% Pt/AC catalysts supported on oxidized AC supports compared
to those prepared on non-oxidized support. Between these catalysts, the highest activity, ca.
80 per cent CO conversion, is obtained on 0.25% SnO x -1% Pt/AC2. The results of CO
oxidation tests conducted on sequentially impregnated 0.25%SnO x -1%Pt/AC samples has
shown that air oxidized support had the highest activity and selectivity level. This points to
the positive effect of the presence of thermally stable surface groups on AC.
CO hydrogenation: We have previously tested bimetallic Ni-Mo/Al 2 O 3 for CO
hydrogenation, and the results have shown the enhancement in catalytic activity and
C 2 -C 4 selectivity caused by the synergetic interaction between Ni and Mo. In this study, the
same bimetallic system was tested using several AC supports with the aim to exploit the
beneficial effects of changes in AC surface chemistry resulting from different oxidation
treatments. On these AC supports, three sets of monometallic catalysts with 5wt% Ni and
10wt % Ni loading and three sets of bimetallic catalysts with 5wt%
Ni-5wt%Mo and 10wt%Ni-5wt%Mo loading are prepared using the incipient wetness
technique. The results of these experiments have shown that (i) the formation of oxygen
bearing surface groups enhances both metal dispersion and activity of monometallic Ni/AC
samples and (ii) the presence of oxygen bearing surface groups on AC supports increases the
activity of the bimetallic Ni-Mo system drastically due to the enhanced interaction between
metals caused especially by the changed reduction properties of the catalysts.
ACKNOWLEDGEMENT
This work is financially supported by State Planning Organization of Turkey (DPT) through
projects 01K120300 and 03K120250, and Boğaziçi University through 05HA501.
References
1 Aksoylu, A. E., Freitas, M. M. A, Pereira, M. F. R., Figueiredo, J. L., Carbon, 39(2)
(2001) 175-185
2 Aksoylu, A. E., Freitas, M. M. A, Figueiredo, J. L., Applied Catalysis A: General, 192
(2000) 29-42
3 Aksoylu, A. E., Freitas, M. M. A, Figueiredo, J. L., Catalysis Today, 62 (2000) 337-346
4 Ozkara, S., Aksoylu, A. E., Applied Catalysis A: General, 251 (2003) 75-83
5 Aksoylu, A. E., Isli, A. I., Onsan, Z. I., Applied Catalysis A: General, 183(2) (1999) 357-364
6 Aksoylu, A.E., Misirli, Z., Onsan, Z.I., Applied Catalysis A: General 168(2) (1998)
385-397.
7 Aksoylu, A.E., Onsan, Z.I., Applied Catalysis A: General 168(2) (1998) 399-407
267