(US5217702-A)      Prepn. of lithium aluminate (contg. at least 95 wt.% gamma phase, with BET surface area more than 10 m2/g) comprises mixing lithium aluminate (BET surface area less than 8 m2/g) with aq. H2O2 soln. (5-70 wt.%) at temps. above 0 deg.C for at least 30 min.; then sepn. of the solid, which is washed, dried at above 200 deg.C and ground to a fine powder. The starting material is produced by calcining a mixt. of LiOH (or its thermally unstable salt) and Al oxide, hydroxide, alkoxide or nitrate at 750-800 deg.C for at least 6 hr.    USE -   The prod. is converted to inert supporting tiles for contg. molten carbonate in fuel cells.    (JP7500563-W)      Prepn. of lithium aluminate of at least 95% gamma phase with BET surface area above 10 m2/g comprises mixing a gamma lithium aluminate with surface area below 8 m2/g with a 5-70% aq. H2O2 soln. for at least 0.5 hr. above 0 deg. C, sepg. the gamma lithium aluminate from the H2O2, drying it by heating above 200 deg. C and grinding.    Also claimed is the prepn. to obtain a gamma lithium aluminate in which fresh H2O2 soln. is mixed for at least 0.5 hr. to give a gamma lithium aluminate with BET surface area above 20 m2/g.    Pref. the lithium aluminate having surface area below 8 m2/g is prepd. by calcining (pref. at 750-800 deg. C for at least 6 hrs.) a mixt. of lithium hydroxide, carbonate, nitrate, peroxide, oxalate, acetate, benzoate or formate and an aluminium source, pref. alumina, boehmite, or aluminium hydroxide, nitrite or alkoxide.    USE/ADVANTAGE -   The predominantly gamma phase lithium aluminate is a support for carbonate electrolyte in molten carbonate fuel cells. The process is simple and rapid    (JP96022737-B2)      Prepn. of lithium aluminate of at least 95% gamma phase with BET surface area above 10 m2/g comprises mixing a gamma lithium aluminate with surface area below 8 m2/g with a 5-70% aq. H2O2 soln. for at least 0.5 hr. above 0 deg. C, sepg. the gamma lithium aluminate from the H2O2, drying it by heating above 200 deg. C and grinding.    Also claimed is the prepn. to obtain a gamma lithium aluminate in which fresh H2O2 soln. is mixed for at least 0.5 hr. to give a gamma lithium aluminate with BET surface area above 20 m2/g.    Pref. the lithium aluminate having surface area below 8 m2/g is prepd. by calcining (pref. at 750-800 deg. C for at least 6 hrs.) a mixt. of lithium hydroxide, carbonate, nitrate, peroxide, oxalate, acetate, benzoate or formate and an aluminium source, pref. alumina, boehmite, or aluminium hydroxide, nitrite or alkoxide.    USE/ADVANTAGE -   The predominantly gamma phase lithium aluminate is a support for carbonate electrolyte in molten carbonate fuel cells. The process is simple and rapid