Abstract
The incorporation effect of tungsten as an activity‐promotional modifier into the Ni‐promoted Mo/γ‐Al2O3 catalyst was studied. Series of W‐incorporated catalysts with different content of tungsten were prepared by changing the impregnation order of nickel and tungsten onto a base Mo/γ‐Al2O3. Catalytic activities were measured from the atmospheric reactions of thiophene hydrodesulfurization (HDS) and ethylene hydrogenation (HYD). The HDS and HYD activities of the WMo/γ‐Al2O3 catalysts (WM series) initially increased and subsequently decreased with increasing content of tungsten as compared with those of their base Mo/γ‐Al2O3. The maximal activity promotion occurred at the W/(W + Mo) atomic ratio 0.025. For the Ni‐promoted Mo/γ‐Al2O3 catalysts, the effect of W incorporation was greatly dependent on the impregnation order of tungsten. The catalysts prepared by impregnating Ni onto the WMo/γ‐Al2O3 catalysts showed the same trend of activity promotion as for the WM series, while those by impregnating W onto a NiMo/γ‐Al2O3 catalyst resulted in lower activities than their base NiMo/γ‐Al2O3 catalyst. To characterize the catalysts, temperature‐programmed reduction and low‐temperature oxygen chemisorption were conducted. The effects of W incorporation on the NiMo‐based catalysts were discussed in reference to those on the CoMo‐based catalysts.
Similar content being viewed by others
References
S. Eijsbouts, J.J.L. Heinerman and H.J.W. Elzerman, Appl. Catal. A 105 (1993) 53.
S. Eijsbouts, J.J.L. Heinerman and H.J.W. Elzerman, Appl. Catal. A 105 (1993) 69.
R.A. Migone and G.D. Meitzner, in: Proceedings 14th North American Meeting of the Catalysis Society, Snowbird, 1995, Poster Session B, p. B-12.
C. Wivel, R. Candia, B. Clausen, S. Morup and H. Topsøe, J. Catal. 68 (1981) 453.
N.-Y. Topsøe and H. Topsøe, J. Catal. 84 (1983) 386.
D.K. Lee, I.C. Lee and S.I. Woo, Appl. Catal. A 109 (1994) 195.
D.K. Lee, I.C. Lee, S.K. Park, S.Y. Bae and S.I. Woo, J. Catal. 159 (1996) 212.
D.K. Lee, H.T. Lee, I.C. Lee, S.K. Park, S.Y. Bae, C.H. Kim and S.I. Woo, J. Catal. 159 (1996) 219.
C.F. Baes and R.E. Mesmer, The Hydrogenolysis of Cations(Wiley, New York, 1976) pp. 257-260.
A.M. Maitra, N.W. Cant and D.L. Trimm, Appl. Catal. 27 (1986) 9.
N.K. Nag, J. Catal. 92 (1985) 432.
N.K. Nag, K.S.P. Rao, K.V.R. Chary, B.R. Rao and V.S. Subrahmanyam, Appl. Catal. 41 (1988) 165.
B.M. Reddy, K.V.R. Chary, V.S. Subrahmanyam and N.K. Nag, J. Chem. Soc. Faraday Trans. 1 (1985) 1655.
J. Bachelier, J.C. Duchet and D. Cornet, J. Catal. 87 (1984) 283.
W. Zmierczak, G. Muralidhar and F.E. Massoth, J. Catal. 77 (1982) 432.
R. Thomas, E.M. Van Oers, V.H.J. De Beer, J. Medema and J.A. Moulijn, J. Catal. 76 (1982) 241.
P. Arnoldy, M.C. Franken, B. Scheffer and J.A. Moulijn, J. Catal. 96 (1985) 381.
J.L. Brito and J. Laine, J. Catal. 139 (1993) 540.
S. Rajagopal, H.J. Marini, J.A. Marzari and R. Miranda, J. Catal. 147 (1994) 417.
R.A. Kemp, R.C. Ryan and J.A. Smegal, in: Proceedings 9th International Congress on Catalysis, Calgary, Vol. 1 (1988) p. 128.
S.I. Kim, Ph.D. dissertation, KAIST (1991).
S.T. Wong, L. Wang, S. Liu, G. Li, M. Xie and X. Guo, Catal. Lett. 38 (1996) 39.
Rights and permissions
About this article
Cite this article
Lee, D.K., Yoon, W.L. Modification of the alumina‐supported Mo‐based hydrodesulfurization catalysts by tungsten. Catalysis Letters 53, 193–198 (1998). https://doi.org/10.1023/A:1019078511069
Issue Date:
DOI: https://doi.org/10.1023/A:1019078511069