Abstract
Catalysts made of two tungsten precursors (one of them containing phosphorus) impregnated on EMT zeolite were nitridated in flowing pure ammonia and passivated by O2 (1 vol%) in an Ar stream leading to tungsten oxynitrides/EMT (W2N/EMT) and phosphotungsten oxynitrides/EMT (PW2N/EMT). The catalysts were examined by X-ray diffraction, NMR spectroscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. The materials were tested for the cracking/isomerization ofn-heptane at atmospheric pressure and 623 K. Cracking (C3 + C4) was the major (about 90%)n-heptane reaction for all the catalysts. The influence of EMT supercages upon selectivity was observed. The yield ofn-heptane isomers was significantly enhanced for W2N/EMT and principally for PW2N/EMT showing a higher hydrogenation function.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
L. Volpe and M. Boudart, J. Solid State Chem. 59 (1985) 332.
R. Kiessling and L. Peterson, Acta Metallurgica 2 (1954) 676.
S. Sellem, C. Potvin, J.-M. Manoli, R. Contant and G. Djéga-Mariadassou, J. Chem. Soc. Chem. Commun. (1995) 359.
M. Nagai and T. Miya, Catal. Lett. 15 (1992) 105.
M. Nagai, T. Miya and T. Tubor, Catal. Lett. 18 (1993) 9.
F. Delprato, L. Delmotte, J.L. Guth and L. Huve, Zeolites 10 (1990) 546.
C. Baerlocher, L.B. McCusker and R. Chiappetta, Microporous Mater. 2 (1994) 269.
B.L. Su, J.-M. Manoli, C. Potvin and D. Barthomeuf, J. Chem. Soc. Faraday Trans. 89 (1993) 857.
T. Chatelain, J. Patarin, M. Soulard, J.L. Guth and P. Schulz, Zeolites 15 (1995) 90.
J. Leglise, J.-M. Manoli, C. Potvin, G. Djéga-Mariadassou and J. Cornet, J. Catal. 152 (1995) 275.
R. Cid, J. Neira, J. Godoy, J.M. Palacios, S. Mendioroz and A. Lopez-Agudo, J. Catal. 141 (1993) 206.
F. Dougnier, J. Patarin, J.L. Guth and D. Anglerot, Zeolites 12 (1992) 160.
F. Lemos, F.R. Ribero, M. Kern, G. Giannetto and M. Guisnet, Appl. Catal. 29 (1987) 43.
J.A. Martens and P.A. Jacobs, J. Mol. Catal. 78 (1993) L47.
V. Zholobenko, A. Garforth, M. Mahkarova, J. Zhao and J. Dwyer, in:Catalysis by Microporous Materials, Stud. Surf. Sci. Catal., Vol. 94 (Elsevier, Amsterdam, 1995) p. 560.
A. Corma, J. Planelles, J. Sanchez-Marin and F. Tomas, J. Catal. 93 (1985) 30.
M. Guisnet, A. Alvarez, G. Giannetto and G. Pérot, Catal. Today 1(1987) 415.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sellem, S., Potvin, C., Manoli, J.M. et al. Characterization andn-heptane cracking/isomerization catalysis of tungsten oxynitrides on EMT zeolite. Catal Lett 41, 89–94 (1996). https://doi.org/10.1007/BF00811718
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00811718