Small-pored crystalline titanium molecular sieve zeolites and their use in gas separation processes
AssigneeEngelhard Corporation
InventorsSteven M. Kuznicki, Valerie A. Bell, Ivan Petrovic, Bipin T. Desai
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Abstract
Novel gas separation agents with precisely and predictably controlled pore sizes within the range of 3-4 Angstrom units and their preparation from ETS-4 by exchange with cations, particularly multivalent cations such as strontium followed by drying and calcination to effect controlled pore shrinkage is disclosed. These novel materials have utility in gas separation processes particularly the separation of nitrogen from a mixture of the same with methane.
Claims44
A crystalline titanium molecular sieve zeolite having a pore size of approximately 3-4 Angstrom units and a composition in terms of mole ratios of oxide as follows:
- 1.0.+-.0.25 M.sub.2/n O:TiO.sub.2 :ySiO.sub.2 :zH.sub.2 O
- wherein M is at least one cation having a valence n, y is from 1.0 to 10 and z is from 0 to 10, said zeolite being characterized by an X-ray diffraction pattern having the lines and relative intensities set forth in Table 1 of the specification.
A process for preparing a novel crystalline titanium molecular sieve zeolite having a pore size of approximately 3-4 Angstrom units and a composition in terms of mole ratios of oxide as follows:
- 1.0.+-.0.25 M.sub.2/n O:TiO.sub.2 :ySiO.sub.2 :zH.sub.2 O
- wherein M is at least one cation having a valence n, y is from 1.0 to 10 and z is from 0 to 10, said zeolite being characterized by an X-ray diffraction pattern having the lines and relative intensities set forth in Table 1 of the specification, which comprises heating ETS-4 at elevated temperatures for a period of time sufficient to convert said ETS-4 to said novel crystalline titanium molecular sieve zeolite.
Dependencies are inferred from the claim text.