Influence of cerium and lanthanum cations on the thermal stability of HY zeolite. Characterization of the zeolitic structure by nitrogen adsorption |
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| Authors: | J Pires M Brotas Carvalho F Lemos F Ramôa Ribeiro and M Guisnet |
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| Institution: | (1) Centro de Química Física e Radioquímica, Faculdade de Ciências da Universidade de Lisboa, R. Escola Politécnica, 1200 Lisboa, Portugal;(2) Grupo de Estudos de Catálise Heterogénea, Instituto Superior Técnico, Av. Rovisco Pais, 1096 Lisboa Codex, Portugal;(3) UACNRS 350, Catalyse en Chimie Organique, Université de Poitiers, 40 Av. du Recteur Pineau, 86011 Poitiers Cedex, France |
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| Abstract: | Capacities for nitrogen adsorption of HY, CeHY and LaHY zeolites have been measured after calcination at several temperatures. CeHY and LaHY zeolites were prepared by ion exchange of HY, both presenting the same rare earth exchange ratio of 41%. Rare earth HY zeolites calcined at 1073 K present higher adsorption capacity than HY, which allows to conclude that cerium and mainly lanthanum increase the thermal stability of HY zeolite.
                  HY, CeHY LaHY        .  CeHY LaHY  HY, , 41%. 1073 K    HY.  , , , HY.
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