Post-synthesis treatment gives highly stable siliceous zeolites through the isomorphous substitution of silicon for germanium in germanosilicates.

Germanosilicates, an important family of zeolites with increasing number of members and attractive porosities, but containing a large quantity of unstable Ge atoms in the framework, meet with great obstacles in terms of limited thermal and hydrothermal stability when it comes to practical use. A facile stabilization method thus has been developed to substitute isomorphously Ge atoms for Si atoms, giving rise to ultrastable siliceous analogues of the pristine germanosilicates.

[1]  Jordi Rius,et al.  Synthesis of a new zeolite structure ITQ-24, with intersecting 10- and 12-membered ring pores. , 2003, Journal of the American Chemical Society.

[2]  Xiaohong Li,et al.  Postsynthesis of mesoporous MOR-type titanosilicate and its unique catalytic properties in liquid-phase oxidations , 2011 .

[3]  Junliang Sun,et al.  A zeolite family with chiral and achiral structures built from the same building layer. , 2008, Nature materials.

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

[5]  F. Schüth,et al.  How are heteroelements (Ga and Ge) incorporated in silicate oligomers? , 2009, Chemistry.

[6]  A. Corma,et al.  Predicting Structural Feasibility of Silica and Germania Zeolites , 2010 .

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

[8]  T. Sano,et al.  Reversibility of dealumination–realumination process of BEA zeolite , 2001 .

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

[10]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[11]  M. Camblor,et al.  A pure silica chiral polymorph with helical pores. , 2012, Angewandte Chemie.

[12]  X. Zou,et al.  Synthesis and structure of (Me3N)6[Ge32O64]·(H2O)4.5, a thermally stable novel zeotype with 3D interconnected 12-ring channels , 2000 .

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

[14]  J. Čejka,et al.  The Role of Template Structure and Synergism between Inorganic and Organic Structure Directing Agents in the Synthesis of UTL Zeolite , 2010 .

[15]  V. Valtchev,et al.  Framework stabilization of Ge-rich zeolites via postsynthesis alumination. , 2009, Journal of the American Chemical Society.

[16]  O. Yaghi,et al.  Transformation of Germanium Dioxide to Microporous Germanate 4-Connected Nets , 1998 .

[17]  Manuel Moliner,et al.  The ITQ-37 mesoporous chiral zeolite , 2009, Nature.

[18]  Miguel A. Camblor,et al.  ITQ‐7: ein neues, reines Silicatpolymorph mit dreidimensionalem, großporigem Kanalsystem , 1999 .

[19]  N. Bats,et al.  A zeolitic material with a three-dimensional pore system formed by straight 12- and 10-ring channels synthesized with an imidazolium derivative as structure-directing agent. , 2010, Journal of the American Chemical Society.

[20]  K. Houthoofd,et al.  Catalytic activity and extra-large pores of germanosilicate UTL zeolite demonstrated with decane test reaction , 2011 .

[21]  A. Corma,et al.  Crystal Structure of ITQ-26, a 3D Framework with Extra-Large Pores , 2008 .

[22]  De Man,et al.  The relation between zeolite framework structure and vibrational spectra , 1992 .

[23]  A. Corma,et al.  A zeolitic structure (ITQ-34) with connected 9- and 10-ring channels obtained with phosphonium cations as structure directing agents. , 2008, Journal of the American Chemical Society.

[24]  Avelino Corma,et al.  The synthesis of an extra-large-pore zeolite with double three-ring building units and a low framework density. , 2010, Angewandte Chemie.

[25]  Michel Waroquier,et al.  Design of zeolite by inverse sigma transformation. , 2012, Nature materials.

[26]  Jean-Louis Paillaud,et al.  Extra-Large-Pore Zeolites with Two-Dimensional Channels Formed by 14 and 12 Rings , 2004, Science.

[27]  J. Čejka,et al.  Synthesis of isomorphously substituted extra-large pore UTL zeolites , 2012 .

[28]  A. Corma,et al.  Synthesis and Structure Determination of the Hierarchical Meso-Microporous Zeolite ITQ-43 , 2011, Science.

[29]  P. A. Barrett,et al.  ITQ-7: A New Pure Silica Polymorph with a Three-Dimensional System of Large Pore Channels. , 1999, Angewandte Chemie.

[30]  C. Blackwell.  Investigation of zeolite frameworks by vibrational properties. 2. The double-six-ring in group 4 zeolites , 1979 .

[31]  Jiří Čejka,et al.  Postsynthesis transformation of three-dimensional framework into a lamellar zeolite with modifiable architecture. , 2011, Journal of the American Chemical Society.

[32]  Petr Nachtigall,et al.  A family of zeolites with controlled pore size prepared using a top-down method. , 2013, Nature chemistry.