Zeolite membrane with a selectivity enhancing coating
AssigneeExxon Research & Engineering Co.
InventorsHarry William Deckman, Edward William Corcoran, Jr., James Alexander McHenry, Wenyih Frank Lai, Lothar Ruediger Czarnetzki, William Edward Wales
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Abstract
Membranes useful in separating moleculres or catalytic conversions comprise a substrate, a zeolite or zeolite-like layer, a selectivity enhancing coating in contact with the zeolite layer and optionally a permeable intermediate layer in contact with the substrate the zeolite layer being in contact either with the substrate or the optional intermediate layer.
Claims15
A zeolite membrane composition which exhibits a columnar cross-sectional morphology and which allows selective molecules to pass therethrough comprising a substrate having coated thereon a growth enhancing layer and a layer of columnar zeolite crystals on said growth enhancing layer and a selectivity enhancing coating on said columnar zeolite layer and wherein said growth enhancing layer comprises zeolite;
- zeolite and metal oxide;
- zeolite and colloidal metal;
- or zeolite, colloidal metal, and metal oxide, and wherein said growth enhancing layer is a mesoporous or microporous layer and wherein when said growth enhancing layer is a mesoporous growth enhancing layer it has interstices of about 20 to about 2000.ANG., and wherein said columnar zeolite layer comprises zeolite crystals having at least one point between adjacent crystals that is .ltoreq.20.ANG..
Dependencies are inferred from the claim text.