Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
  • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
  • C01B39/46—Other types characterised by their X-ray diffraction pattern and their defined composition
  • C01B39/48—Other types characterised by their X-ray diffraction pattern and their defined composition using at least one organic template directing agent
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
  • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
  • C01B39/06—Preparation of isomorphous zeolites characterised by measures to replace the aluminium or silicon atoms in the lattice framework by atoms of other elements, i.e. by direct or secondary synthesis
  • C01B39/12—Preparation of isomorphous zeolites characterised by measures to replace the aluminium or silicon atoms in the lattice framework by atoms of other elements, i.e. by direct or secondary synthesis the replacing atoms being at least boron atoms

Definitions

• the present invention relates to a method of preparing a synthetic crystalline material. Specifically, the present invention relates to a method of preparing a synthetic crystalline material having the structure type of SSZ-74.
• Zones et al. reported the preparation of multidimensional 10-ring channel system SSZ-74, and its use in various hydrocarbon conversion and separation processes (see WO 2007/079038; US 7,422,732; US 7,357,904; US 7,348,295; US 2007/0144939; US 2007/0148067; US 2007/0148086; US 2007/0149778; US 2007/0149789; US 2007/0149824; US 2007/0149837; and, Baerlocher et al. "Ordered silicon vacancies in the framework structure of the zeolite catalyst SSZ-74", Nature Materials, 2008 Aug.; 7(8):631-5).
• SSZ-74 is a 3-dimensional medium pore zeolite with a silicon vacancy.
• the method of preparing SSZ-74 has comprised contacting under crystallization conditions (1) a source of silicon oxide, (2) a source of aluminum oxide, indium oxide and mixtures thereof, (3) fluoride ions and (4) a structure directing agent comprising a l,r-(hexane-l,6-diyl)bis(l-methylpyrrolidinium) dication having the following structure
• the present invention provides such a method. Specifically, the present invention provides a method of preparing a synthetic crystalline material having an SSZ-74 crystal structure in the absence of a source of fluoride ions.
• the present invention is directed to a method of preparing a synthetic crystalline material; specifically, a method of preparing a synthetic crystalline material having the structure type of SSZ-74.
• the method comprises contacting under crystallization conditions a reaction mixture comprising at least one source of a trivalent element X, a source of silica and a l,l '-(hexane-l ,6-diyl)bis(l- methylpyrrolidinium) dication as structure directing agent (SDA), wherein the reaction mixture contains no source of fluoride ions.
• the reaction mixture comprises an alkali metal cation.
• SSZ-74 is prepared by contacting a reaction mixture comprising at least one source of silica and at least one source of a trivalent element X, where X is aluminum, gallium, iron, titanium, indium, boron or mixtures thereof, with a l,r-(hexane-l,6-diyl)bis(l-methylpyrrolidinium) dication SDA in the absence of fluoride ion.
• the reaction mixture further comprises an alkali metal cation.
• reaction mixture has the following composition, expressed in terms of molar ratios:
• X aluminum, gallium, iron, titanium, indium, boron and mixtures thereof
• Y is an alkali metal cation
• SDA is a l,l '-(hexane-l,6-diyl)bis(l- methylpyrrolidinium) dication.
• the source of silica may be any silica source suitable for use in zeolite synthesis, non-limiting examples of which include silicates such as alkali metal silicate, a tetraalkyl orthosilicate, or, a high surface area silica, for example one sold by Degussa under the trade names Aerosil or Ultrasil, or preferably, an aqueous colloidal suspension of silica, for example one sold by E.I. du Pont de Nemours under the trade name Ludox.
• the silica source is inorganic and conveniently is an aqueous colloidal suspension of silica.
• the trivalent element X may be any source of element X suitable for use in zeolite synthesis.
• trivalent element X is aluminum, boron or mixtures thereof, most preferably aluminum.
• the source of aluminium is conveniently aluminium nitrate or hydrated alumina.
• Other aluminium sources include, for example, other water-soluble aluminium salts, sodium aluminate, or an alkoxide, e.g., aluminium isopropoxide, or aluminium metal, e.g., in the form of chips.
• a non-limiting example of a convenient source of boron is boric acid, preferably used as an aqueous solution.
• the source of alkali metal is advantageously potassium or sodium, sources of which include sodium bromide, potassium bromide, sodium chloride, potassium chloride, sodium nitrate, potassium nitrate, sodium iodide, potassium iodide, sodium hydroxide or sodium aluminate, or any other water soluble sodium and potassium salts that are not detrimental to the formation of SSZ-74.
• the as synthesized material may be calcined, cation-exchanged, and otherwise treated as is known in the art.
• Alkali metal cations in the as-prepared or calcined form may be removed, for example by treatment with concentrated acids, e.g., HCl, or with a fugitive base, e.g., an ammonium compound, to provide the material in its hydrogen form.
• the product After calcination, the product has a characteristic XRD pattern, the essential reflections of which are substantially as set forth in Table 2.
• the products of the invention if required after cation exchange and/or calcining, have utility as catalyst precursors, catalysts, and separation and absorption media. They are especially useful in numerous organic, e.g., hydrocarbon, compound conversions, separations and absorptions. They may be used alone, or in admixture with other molecular sieves, in particulate form, supported or unsupported, or in the form of a supported layer.
• the synthetic crystalline material having an SSZ-74 crystal structure is prepared by combining in a liquid medium, preferably water, at least one source of silica, at least one source of a trivalent element X, where X is aluminum, gallium, iron, boron, titanium, indium and mixtures thereof, and a l,r-(hexane-l,6-diyl)bis(l-methylpy ⁇ Olidinium) dication having an anionic counterion which is not detrimental to the formation of SSZ-74.
• the reaction mixture comprises an alkali metal cation.
• the reaction mixture contains no source of fluoride ions.
• the aqueous solution is maintained under conditions sufficient to form crystals of SSZ-74.
• the reaction mixture is maintained at an elevated temperature until the crystals of the SSZ-74 are formed.
• the water in the reaction mixture may, but does not need to be evaporated off.
• Crystallization is carried out in an autoclave under autogenous pressure, at a temperature below 160 0 C, preferably between 120 0 C and 160 0 C, more preferably between 130 0 C and 15O 0 C.
• the crystallization period is typically greater than 1 day and preferably from about 3 days to about 28 days.
• the Si/X ratio in the reaction mixture is preferably 40 to 160, more preferably from 40 to 100, most preferably about 40.
• SSZ-74 seeds may optionally be used. Seeds can sometimes reduce crystallization time and may even modify crystal size and morphology.
• Crystallization may take place with or without agitation.
• the product is separated from the reaction mixture by standard separation techniques, e.g., centrifugation or decantation.
• the separated material is then washed with water and optionally dried.
• the separated material may be vacuum dried, air dried or dried by other suitable means. Depending on the drying technique used, drying may typically take from about several minutes, e.g., 2 - 10 minutes, to several hours, e.g., 24 - 48 hours, from ambient temperature to 300 0 C.
• a gel was prepared by combining 21.5 mg deionized water, 141.2 mg Ludox LS-30 (30% SiO 2 ), 177.9 mg 25.8% l,l '-(hexane-l,6-diyl)bis(l- methylpyrrolidinium), 109.3 mg 20% NaBr solution, and 50.2 mg 15% A1(NO 3 ) 3 solution in a 1.5 ml stainless steel vessel.
• the starting gel had the following composition, expressed in molar ratios:
• a gel was prepared by combining 51.7 mg deionized water, 143.4 mg Ludox LS-30 (30% SiO 2 ), 151.1 mg 25.8% l,l '-(hexane-l,6-diyl)bis(l- methylpyrrolidinium), 138.3 mg 20% KBr solution, and 25.5 mg 15% A1(NO 3 ) 3 solution in a 1.5 ml stainless steel vessel.
• the starting gel had the following composition, expressed in molar ratios:
• a gel was prepared by combining deionized water, 154.7 mg Ludox LS-30 (30% SiO 2 ), 130.1 mg 25.8% l,l '-(hexane-l,6-diyl)bis(l- methylpyrrolidinium), and 24 mg 3% boric acid solution in a 1.5 ml stainless steel vessel. No alkali metal was present in the reaction mixture.
• the starting gel had the following composition, expressed molar ratios:

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• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Materials Engineering (AREA)
• Inorganic Chemistry (AREA)
• Silicates, Zeolites, And Molecular Sieves (AREA)

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• 2008
  • 2008-09-12 US US12/283,592 patent/US7651677B1/en not_active Expired - Fee Related
• 2009
  • 2009-09-11 WO PCT/US2009/005116 patent/WO2010030386A1/en not_active Ceased
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