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Alternative Membrane Material for ITM Syngas Disclosure Number: IPCOM000032925D
Publication Date: 2004-Nov-18
Document File: 1 page(s) / 29K

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Alternative Membrane Material for ITM Syngas


Synthesis gas, a mixture of hydrogen and carbon monoxide, can be produced by oxidatively-reforming a hydrocarbon-containing stream which passes on one side of a non-porous, mixed conducting ceramic membrane, with oxygen from a hot, oxygen-containing gas, preferably air, which passes on the other side of the ceramic membrane.  These membranes, known in the art generically as ion transport membranes (ITMs), utilize an oxygen chemical potential gradient across the membrane to cause oxygen ions to migrate through the membrane.

Membranes can be fabricated as tubes or flat plates that are arranged in modules for efficient contact with the hot air and hydrocarbon-containing streams. Synthesis gas and nitrogen-enriched non-permeate products are withdrawn from the modules.  A comprehensive review of ion transport membranes is given by M. Stoukides in Catalysis Reviews - Science and Engineering, 42(1&2), 2000.

Compositions currently known in the art that are used for ITM Syngas membrane material can be generalized as perovskites (patented by BP/ The Standard Oil Company); brownmillerites (described by Eltron Research, Incorporated); and dual phase systems (patented by BP/ The Standard Oil Company). Also included is a layered, mixed metal oxide composition represented by (Sr1-xMx)α(Fe1-yCoy) α+ßOδ, where M is a metal selected from elements 56-71, and
Y~1< α< ~4, and 0.1< ß< ~20, and 0< X <1,0< Y <1, and 1.1< (α+ ß)/ α< ß (as pat...