Characterization of stability and porosity of SAPO-40 using m-xylene as model reaction

Lourenço, J. P.; Ribeiro, M. F.; Ribeiro, F. R.; Rocha, J.; Gabelica, Z.

http://hdl.handle.net/10400.1/2049

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Abstract(s)

The thermal and hydrothermal stability of SAPO-40 has been evaluated using the isomerization of m-xylene as model reaction. The characterization of the porosity was also studied and compared to other well known structures, namely Y zeolite, mordenite and ZSM-5. The structural changes that occur under thermal treatments influence the activity and selectivity of SAPO-40, while hydrothermal treatments do not significantly change those properties. The results confirm the high stability of SAPO-40 under thermal and hydrothermal treatments. Catalytic tests and adsorption of cyclohexane indicate that regular large side pockets or lobes exist along the main channels of SAPO-40, which create a large void volume responsible for the high rate of adsorption, high amount of adsorbed cyclohexane and the low shape selectivity in m-xylene isomerization.

Keywords

Stability m-Xylene isomerization Porosity characterization SAPO-40 Silico-aluminophosphates

URI

http://hdl.handle.net/10400.1/2049

Citation

Lourenço, J. P.; Ribeiro, M. F.; Ribeiro, F. R.; Rocha, J.; Gabelica, Z. Characterization of stability and porosity of SAPO-40 using m-xylene as model reaction, Appl. Catal. A: General, 148, 167-180, 1996.