ULTRA-THIN CO2 SELECTIVE ZEOLITE MEMBRANE FOR CO2 SEPARATION FROM POST-COMBUSTION FLUE GAS
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United States of America Patent
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Issued Date -
Apr 28, 2011
app pub date -
Oct 28, 2009
filing date -
Oct 28, 2009
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Abstract
A method for producing a crystalline silicoaluminophosphate (SAPO) membrane in which a porous support is contacted with SAPO seed crystals to form a SAPO seeded porous support. The SAPO seeded porous support is filled with an aqueous SAPO synthesis gel including a mixture of sources of aluminum, phosphorus, silicon, oxygen, water, and a templating agent, forming a gel-filled porous structure which is then heated to form a SAPO layer of SAPO crystals on a surface of and/or within pores of the porous support. The SAPO layer is calcined, thereby removing the templating agent and forming a supported porous SAPO membrane layer, which is then subjected to a pore size reduction post-synthesis treatment process, producing a reduced pore size supported porous SAPO membrane layer having an average pore size of less than about 0.38 nm.
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