Patent ID: 7585356
Filing Date: 2009-09-08
Classification: B01D,C01B,Y02C

Abstract:
1. A composite membrane useful for the preferential permeation of gases, comprising: an amorphous mixed-element surface layer comprising silica and at least one oxide of an element selected from the group consisting of B, F, Al, P, Ga, Ge, As, In, Sn, Sb, Sc, Ti, V, Y, Zr, Nb, La, Hf, and Ta; optionally, a porous substrate on which said surface layer is deposited; and a porous support on which said substrate or mixed-element surface layer is deposited; wherein the permeance of the membrane is greater than 1×10 wherein the membrane incurs a drop in permeance of less than 80% upon exposure to a stream containing 60 mol % water vapor at 673 K for 120 h.