Extra-Large-Pore Zeolites with Two-Dimensional Channels Formed by 14 and 12 Rings

Stable zeolites that have larger pore apertures and a three-dimensional pore topology are of interest because they could be used to adsorb larger molecules, particularly for application in oil refining. Several large-pore zeolitic materials with channels formed by openings of more than 12 rings are known, but all of them have a one-dimensional channel system that limits their use in catalysis. We report the synthesis and some characterizations of IM-12, a thermally stable germanium-containing zeolite that contains the first two-dimensional channel system with extra-large pores formed by 14- and 12-ring channels.

[1]  A. Corma,et al.  Preferential Location of Ge in the Double Four-Membered Ring Units of ITQ-7 Zeolite , 2002 .

[2]  Jordi Rius,et al.  A large-cavity zeolite with wide pore windows and potential as an oil refining catalyst , 2002, Nature.

[3]  R. Lobo,et al.  A high-silica zeolite with a 14-tetrahedral-atom pore opening , 1996, Nature.

[4]  Jordi Rius,et al.  Pure Polymorph C of Zeolite Beta Synthesized by Using Framework Isomorphous Substitution as a Structure-Directing Mechanism. , 2001, Angewandte Chemie.

[5]  C. Lecomte,et al.  Location of fluoride counterion in As-synthesized silicalite-1 by single crystal X-ray diffraction , 2002 .

[6]  Jordi Rius,et al.  A zeolite with interconnected 8-, 10- and 12-ring pores and its unique catalytic selectivity , 2003, Nature materials.

[7]  Christopher W. Jones,et al.  Synthesis, Characterization, and Structure Solution of CIT-5, a New, High-Silica, Extra-Large-Pore Molecular Sieve , 1998 .

[8]  H. Kessler,et al.  New Route to Pentasil-Type Zeolites Using a Non Alkaline Medium in the Presence of Fluoride Ions , 1986 .

[9]  A. Corma,et al.  A zeolite structure (ITQ-13) with three sets of medium-pore crossing channels formed by 9- and 10-rings. , 2003, Angewandte Chemie.

[10]  D. Vaughan,et al.  Structure of the first silicate molecular sieve with 18-ring pore openings, ECR-34. , 2003, Journal of the American Chemical Society.

[11]  H. Gies,et al.  The substitution of germanium for silicon in AST-type zeolite , 2003 .