Modification of the Porosity of Pillared Clays by Carbon Deposition II. Hydrocarbon Cracking

Springer Science and Business Media LLC - Tập 4 - Trang 5-15 - 1997
N. Maes1, E.F. Vansant1
1Department of Chemistry, Laboratory of Inorganic Chemistry, University of Antwerp, Wilrijk, Belgium

Tóm tắt

To enhance the adsorption selectivity of pillared clays an attempt is made to modify the initial pore size by a controlled deposition of carbon. Cracking of hydrocarbons in the pores of the pillared clay results in coke deposits which can alter the pore size. Based on the evaluation of the amount of coke, the coke density, the decrease in micropore volume, changes in the micropore size distribution and the acidity it was possible to distinguish between pore-blocking, pore-filling and pore-narrowing effects. The modification mechanisms strongly depend on the initial porous structure, the acidity (Brönsted/Lewis), the cracking conditions (static or flow) and the hydrocarbons used. The carbon deposition results in a decrease in pore volume due to pore-filling (Ti-PILC) and pore-blocking (Al-PILC) without achieving a controlled pore-narrowing but some indications for pore-entrance narrowing were found.

Tài liệu tham khảo

N. Maes, I. Heylen, P. Cool, and E.F. Vansant, Applied Clay Science (In Press, 1997).

E.F. Vansant, Pore Size Engineering of Zeolites (John Wiley and Sons, 1990).

A.L. Cabrera, J.E. Zehner, C.G. Coe, T.R. Gaffney, T.S. Farris, and J.N. Armor, Carbon 31(6), 969 (1993).

J.T. Richardson, Principles of Catalyst Development (Plenum Press, New York, 1989), p. 210.

E.E. Wolf and F. Alfani, Catal. Rev.-Sci. Eng. 24(3), 329 (1982).

E.G. Derouane, in Catalysis by Acids and Bases. Studies in Surface Science and Catalysis, Vol. 20, edited by B. Imelik, C. Naccache, G. Coudurier, Y. Ben Taarit, and J.C. Vedrine (Elsevier Science Publishers B.V.: Amsterdam, 1985), p. 221.

N. Maes and E.F. Vansant, J. Porous Materials, 3, 257 (1996).

J. Sterte, Clays Clay Miner. 34(6), 658 (1986).

J. Sterte, Clays Clay Miner. 39(2), 167 (1991).

J.H. De Boer, B.G. Linsen, and TH.J. Osinga, J. Catalysis 4, 643 (1965).

H.Y. Zhu, N. Maes, and E.F. Vansant, in Characterization of Porous Solids III. Studies in Surface Science and Catalysis, Vol. 87, edited by J. Rouquerol, F. Rodriguez-Reinoso, K.S.W. Sing, and K.K. Unger (Elsevier Science B.V.: Amsterdam, 1994), p. 457.

H.Y. Zhu, N. Maes, A. Molinard, and E.F. Vansant, Microporous Materials 3, 235 (1994).

N. Maes, H.Y. Zhu, and E.F. Vansant, J. Porous Materials 2(1), 97 (1995).

A. Molinard, P. Cool, and E.F. Vansant, Microporous Materials 3, 149 (1994).

N. Maes, I. Heylen, P. Cool, M. De Bock, C. Vanhoof, and E.F. Vansant, J. Porous Materials, 3, 47 (1996).

R.C. Weast, Handbook of Chemistry and Physics (CRC Press, Ohio, 1972), p. b79.

G.M. Jenkins and K. Kawamura, Polymeric Carbons, Carbon Fibre, Glass and Char (Cambridge University Press, Cambridge, 1976), p. 11.

P. Magnoux, P. Roger, C. Canaff, V. Fouche, N.S. Gnep, and M. Guisnet, in Catalyst Deactivation. Studies in Surface Science and Catalysis, Vol. 34, edited by B. Delmon and G.F. Froment (Elsevier Science Publishers B.V.: Amsterdam, 1987), p. 317.

S.A. Bagshaw and R.P. Cooney, Chem. Mater. 5, 1101 (1993).

H.L. Del Castillo and P. Grange, Applied Catalysis A: General 103, 23 (1993).

A. Bernier, L.F. Admaiai, and P. Grange, Applied Catalysis 77, 269 (1991).

L. Khalfallah Boudali, A. Ghorbel, D. Tichit, B. Chiche, R. Dutartre, and F. Figueras, Microporous Materials 2, 525 (1994).

S.J. Gregg and K.S.W. Sing, Adsorption, Surface Area and Porosity (Academic Press, New York, 1982).

H. Auer and H. Hofmann, Applied Catalysis A: General 97, 23 (1993).

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Springer Science and Business Media LLC

Tập 4

5-15

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