Technical and Economic Aspects and Prospects for Gas Separation with Inorganic Membranes

Permeation and separation studies on microporous sol-gel modified ceramic membranes

“…Microporous (rpore<l nm [1]) ceramic membranes are very attractive systems for gas separation processes [2][3][4][5] due to high molecular sieve-like selectivities, and high stability at enhanced temperatures and in chemically aggressive atmospheres (compared with polymeric membranes). Also, the application of ceramic membranes in so-called membrane reactors, using catalytically active or passive membranes, has proven to be very promising and an increasing research effort in this field is observed in the past few years [6][7][8][9][10][11].…”

Characteristics of Alumina Membranes Prepared From Different Metal-Organic Compounds

“…The industrial applications that use inorganic membranes include particulate filtrations, reactions and separations. Inorganic membranes have been used to separate uranium isotopes, [1] separate non-combustible components from the fuel gas to increase the Btu contents, [2] separate carbon monoxide from hydrogen produced from steam reforming of natural gas, [2] separate hydrogen from other major constituents, separate carbon dioxide and water vapor from other coal gasifier products, [3] separate air into nitrogen and oxygen, [4] remove acid gases such as sulfur dioxide, hydrogen sulfide, and carbon dioxide from flue gases, [3] remove CO 2 or H 2 from methane and other hydrocarbons, [5,6,7] remove hydrogen sulfide from fuel gases, [3] adjust H 2 /CO ratio in synthesis gases, [4] and recover helium and methane from biogases. [4] Alumina (Al 2 O 3 ) has been selected to prepare inorganic membrane since it is chemically inert and stable to its melting point of 2050 K. It has good mechanical strength and endurance; in its pure form, alumina has a high Young's modulus of approximately 400 GN m −2 .…”

Molecular dynamics of gases and vapors in nanoporous solids. Final LDRD project report

“…The diffusion follows a slightly modified Arrhenius law. Fain (1991) presented selectivities as a function of pore size based on several concepts, including Knudsen diffusion, hard sphere/wall appro&nations, momentum accommodation, and pore plugging for mixtures. The model was for acylindrical pore which makes comparison with imogolite ideal.…”