High temperature membrane separation techniques have been applied to gas mixtures involved in coal utilization. For coal gasification, H{sub 2}S has been removed from the syn-gas stream, split into hydrogen which enriches the syn-gas, and sulfur which can be condensed from an inert gas sweep stream. For coal combustion, SO{sub 2} has been separated from the flue gas, with concentrated SO{sub 3} produced as a by-product. Both processes appear economically viable but each requires fundamental improvements: both the H{sub 2}S and SO{sub 2} cells require more efficient membranes and the H{sub 2}S cell needs a more efficient anode. Membranes will be fabricated by either hotpressing, impregnation of sintered bodies, or tape casting. Research conducted during the present quarter is highlighted, with an emphasis on progress toward these goals. Membranes tested for SO{sub x} removal and H{sub 2}S were Si{sub 3}N{sub 4} and zirconia, respectively.