Method of making molecular sieves

Patent · Tue Jul 06 04:00:00 EDT 1993

OSTI ID:7369007

Zones, S I; Nakagawa, Yumi

A method is described for preparing molecular sieves comprising: (a) preparing an aqueous mixture comprising: a source zeolite, wherein said source zeolite contains sodalite substructures and has a tetrahedra atom density of less than about 15 TO[sub 2] per 1,000 [angstrom][sup 3], and wherein said source zeolite has a silica/alumina mole ratio greater than 200; an alkali metal oxide; and an organic template, and wherein said aqueous mixture has a composition in terms of mole ratios of oxides falling within the following ranges: M[sub +]/SiO[sub 2] = 0.01-1.00; OH[sub [minus]]/SiO[sub 2] = 0.15-0.80; H[sub 2]O/SiO[sub 2] = 20-120; Q/SiO[sub 2] = 0.10-1.00; SIO[sub 2]/Y[sub 2]O[sub 3] > 200; wherein M[sub +] is an alkali metal not supplied by the source zeolite, Q is an organic template, Y is aluminum from the source zeolite, and Si is silica from the source zeolite; and (b) maintaining the aqueous mixture under conditions sufficient to form crystals of the molecular sieve.

• Assignee: Chevron Research and Technology Co., San Francisco, CA (United States)
• Patent Number(s): US 5225179; A
• Application Number: PPN: US 7-936955
• OSTI ID: 7369007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
ADSORBENTS
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTALLIZATION
FABRICATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MICROSTRUCTURE
MINERALS
MOLECULAR SIEVES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SILICATE MINERALS
SILICON COMPOUNDS
SILICON OXIDES
ZEOLITES