2D-3D structures: The hydrothermal transformation of a layered sodium silicate, Na-RUB-18, into mordenite zeolite

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)The synthesis of the high-silica mordenite zeolite by hydrothermal transformation of the Na-RUB-18 layered silicate was conducted by the addition of Al[OCH(CH3)(2)](3) or Na2Al2O4 into the gel after 7 days of hydrothermal treatment of a non-aluminum gel. Extensive characterization showed that the samples were obtained in good crystallinity in periods varying from 7 to 14 days after the addition of the aluminum source when Al[OCH(CH3)(2)](3) was used and after 14 days for Na2Al2O4. Results of Si-29 and Al-27 NMR suggest a gradual transformation of Na-RUB-18 into MOR by the appearance of signals which correspond to silicon atoms coordinated to land 2 Al and one signal corresponding to tetrahedrally coordinated aluminum atoms, both nonexistent in Na-RUB-18. (C) 2013 Elsevier Inc. All rights reserved.177143150Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq