Abstract
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.
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Maes, N., Vansant, E. Modification of the Porosity of Pillared Clays by Carbon Deposition II. Hydrocarbon Cracking. Journal of Porous Materials 4, 5–15 (1997). https://doi.org/10.1023/A:1009663020550
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DOI: https://doi.org/10.1023/A:1009663020550