Hydrothermally-stable silica-based composite membranes for...

Details Hydrothermally-stable silica-based composite membranes for... Hydrothermally-stable silica-based composite membranes for...

2011-01-04

2011-01-04

Greene, Jason M (Department: 1797)

Gas separation: apparatus

Apparatus for selective diffusion of gases

Plural layers

C096S004000, C096S007000, C096S010000, C095S055000, C095S056000

Reexamination Certificate

active

07862648

ABSTRACT:
Thin layers of a mixed composition are deposited on a porous substrate by chemical vapor deposition in an inert atmosphere at high temperature. The resulting membrane has excellent stability to water vapor at high temperatures. An exemplary membrane comprises an amorphous mixed-element surface layer comprising silica and at least one oxide of additional element, an optional 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 higher than 1×10−7mol m−2s−1Pa−1and the selectivity of H2over CO, CO2, and CH4is larger than 100, and wherein the H2permeance of the membrane after exposure to a stream containing 60 mol % water vapor at 673 K for 120 h is at least 50% of its initial H2permeance.

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