The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of UZSi-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.

The present invention relates to novel microporous zirconium silicate compositions that are formulated to remove toxins, e.g. potassium ions, from the gastrointestinal tract at an elevated rate without causing undesirable side effects. The preferred formulations are designed avoid increase in pH of urine in patients and/or avoid potential entry of particles into the bloodstream of the patient. Also disclosed is a method for preparing high purity crystals of UZSi-9 exhibiting an enhanced level of potassium exchange capacity. These compositions are particularly useful in the therapeutic treatment of hyperkalemia.

The present invention relates to a crystallised solid, called IZM-5, comprising a chemical composition expressed on an anhydrous base, in terms of mole, and defined by the following general formula: Sn.sub.aZn.sub.bS.sub.8: cR, wherein R represents at least one nitrogenous organic species; S sulphur, “a” is the molar amount of tin, denoted Sn, between 0.1 and 5; “b” is the molar amount of zinc, denoted Zn, between 0.2 and 8; “c” is the molar amount of the nitrogenous organic species R between 0 and 4.

The present invention relates to a crystallised solid, called IZM-5, comprising a chemical composition expressed on an anhydrous base, in terms of mole, and defined by the following general formula: Sn.sub.aZn.sub.bS.sub.8: cR, wherein R represents at least one nitrogenous organic species; S sulphur, “a” is the molar amount of tin, denoted Sn, between 0.1 and 5; “b” is the molar amount of zinc, denoted Zn, between 0.2 and 8; “c” is the molar amount of the nitrogenous organic species R between 0 and 4.

The present disclosure relates to an RHO-type zeolite comprising caesium and M.sup.1 .sub.wherein M.sup.1 is selected from Na and/or Li remarkable in that it has a Si/Al molar ratio comprised between 1.2 and 3.0 as determined by .sup.29Si magic angle spinning nuclear magnetic resonance, in that the RHO-type zeolite has a specific surface area comprised between 40 m.sup.2g.sup.−1 and 250 m.sup.2g.sup.−1 as determined by N.sub.2 adsorption measurements, in that the RHO-type zeolite being in the form of one or more nanoparticles with an average crystal size comprised between 10 nm and 400 nm as determined by scanning electron microscopy wherein said nanoparticles form monodispersed nanocrystals or form aggregates of nanocrystals having an average size ranging from 100 nm to 500 nm, as determined by scanning electron microscopy. Amorphous precursors, devoid of an organic structure-directing agent, as well as a method for preparation of these amorphous precursors in the absence of such organic structure-directing agent and method for preparation of the RHO-type zeolites, are alos described. Finally, the use of the RHO-type zeolite as a sorbent for carbon dioxide is also demonstrated.

The present disclosure relates to an RHO-type zeolite comprising caesium and M.sup.1 .sub.wherein M.sup.1 is selected from Na and/or Li remarkable in that it has a Si/Al molar ratio comprised between 1.2 and 3.0 as determined by .sup.29Si magic angle spinning nuclear magnetic resonance, in that the RHO-type zeolite has a specific surface area comprised between 40 m.sup.2g.sup.−1 and 250 m.sup.2g.sup.−1 as determined by N.sub.2 adsorption measurements, in that the RHO-type zeolite being in the form of one or more nanoparticles with an average crystal size comprised between 10 nm and 400 nm as determined by scanning electron microscopy wherein said nanoparticles form monodispersed nanocrystals or form aggregates of nanocrystals having an average size ranging from 100 nm to 500 nm, as determined by scanning electron microscopy. Amorphous precursors, devoid of an organic structure-directing agent, as well as a method for preparation of these amorphous precursors in the absence of such organic structure-directing agent and method for preparation of the RHO-type zeolites, are alos described. Finally, the use of the RHO-type zeolite as a sorbent for carbon dioxide is also demonstrated.

The present disclosure relates to a chabazite-type zeolite, comprising at least two cages composed of 4- and 8-membered rings connected by one 6-membered double ring, remarkable in that it has a Si/Al molar ratio comprised between 1 and 15, in that it comprises caesium and potassium with a Cs/K molar ratio of at most 5.0 and in that it forms nanoparticles with an average crystal size comprised between 5 nm and 250 nm and with a specific surface area comprised between 50 m.sup.2g.sup.−1 and 200 m.sup.2g.sup.−1. Amorphous precursors, devoid of an organic structure-directing agent, as well as a method for preparation of these amorphous precursors in the absence of such organic structure-directing agent and method for preparation of the chabazite-type zeolite, are also described. Finally, the use of the chabazite-type zeolite as a sorbent for carbon dioxide is also demonstrated.

The present disclosure relates to a chabazite-type zeolite, comprising at least two cages composed of 4- and 8-membered rings connected by one 6-membered double ring, remarkable in that it has a Si/Al molar ratio comprised between 1 and 15, in that it comprises caesium and potassium with a Cs/K molar ratio of at most 5.0 and in that it forms nanoparticles with an average crystal size comprised between 5 nm and 250 nm and with a specific surface area comprised between 50 m.sup.2g.sup.−1 and 200 m.sup.2g.sup.−1. Amorphous precursors, devoid of an organic structure-directing agent, as well as a method for preparation of these amorphous precursors in the absence of such organic structure-directing agent and method for preparation of the chabazite-type zeolite, are also described. Finally, the use of the chabazite-type zeolite as a sorbent for carbon dioxide is also demonstrated.

A zeolite membrane composite including a porous support and a zeolite membrane formed on a surface of the porous support. The zeolite membrane has an LTA-type crystal structure. The first atomic ratio: Si/Al of silicon element (Si) to aluminum element (Al) in the zeolite membrane is 1.29 or greater and 1.60 or less.

A zeolite membrane composite including a porous support and a zeolite membrane formed on a surface of the porous support. The zeolite membrane has an LTA-type crystal structure. The first atomic ratio: Si/Al of silicon element (Si) to aluminum element (Al) in the zeolite membrane is 1.29 or greater and 1.60 or less.