Abstract: The invention relates to a X-zeolite based adsorbent granulate with faujasite structure and a molar SiO2/Al2O3 ratio of ?2.1-2.5, wherein the granulate has an average transport pore diameter of >300 nm and a negligible fraction of meso-pores and wherein the mechanical properties of the granulate are at least the same as or better than the properties of an X-zeolite based granulate formed using an inert binder and the equilibrium adsorption capacities for water, CO2 and nitrogen are identical to those of pure X-zeolite powder with a similar composition.

Abstract: The present invention relates to compact zeolite preforms, which are characterized in that they have as high a zeolite content as possible determined by means of suitable adsorption methods. A further aspect of the present invention relates to a method for producing compact zeolite preforms, said method being characterized in that: a) a mouldable mixture, comprising zeolite, one or more zeolite precursor components, water (if necessary) and one or more organic additives (if necessary) is processed into preforms; b) the preforms obtained in this way are subjected to thermal treatment; and c) the thermally treated preforms are watered, aged and brought into contact with a further component from which, in combination with the zeolite precursor components, zeolite can be produced and exposed to conditions under which zeolite forms from the further component and the zeolite precursor components.

Abstract: The invention relates to a X-zeolite based adsorbent granulate with faujasite structure and a molar SiO2/Al2O3 ratio of ?2.1-2.5, wherein the granulate has an average transport pore diameter of >300 nm and a negligible fraction of meso-pores and wherein the mechanical properties of the granulate are at least the same as or better than the properties of an X-zeolite based granulate formed using an inert binder and the equilibrium adsorption capacities for water, CO2 and nitrogen are identical to those of pure X-zeolite powder with a similar composition.

Abstract: The invention relates to a X-zeolite based adsorbent granulate with faujasite structure and a molar SiO2/Al2O3 ratio of ?2.1-2.5, wherein the granulate has an average transport pore diameter of >300 nm and a negligible fraction of meso-pores and wherein the mechanical properties of the granulate are at least the same as or better than the properties of an X-zeolite based granulate formed using an inert binder and the equilibrium adsorption capacities for water, CO2 and nitrogen are identical to those of pure X-zeolite powder with a similar composition.

Abstract: Nitrogen oxides and low molecular weight hydrocarbons are removed from air by subjecting the air to a temperature swing adsorption process using as the adsorbent a composite zeolite product containing both zeolite type A and zeolite type X. The composite zeolite product is prepared by crystallizing a sodium ion- or sodium ion- and potassium ion-containing alumina-silica hydrogel under conditions which result in the production of a zeolitic composite which contains both zeolite type A and zeolite type X crystal domains. In a preferred embodiment, calcium ions constitute a substantial number of the composite's exchangeable cations and the type X portion of the composite zeolite product has a silicon-to-aluminum atomic ratio in the range of 0.9 to less than 1.15. The nitrogen oxide- and hydrocarbon-selective adsorbent can be incorporated into an atmospheric air prepurification plant downstream of a water vapor-selective adsorbent and a carbon dioxide-selective adsorbent.

Abstract: Zeolites exchanged with lithium cations and polyvalent cations are prepared by first partially ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with polyvalent cations, then heat-treating the partially polyvalent cation-exchanged zeolite, then ion exchanging the heat-treated zeolite with ammonium cations, and then reacting the ammonium cation-exchanged zeolite with a water-soluble lithium compound under conditions which result in the removal of ammonia from the reaction zone.