Abstract: A film production method for producing a layer containing a metal oxide, the film production method including: a heating step of heating a metal foil containing a first metal by bringing a part of the metal foil into contact with at least one heat generator; a first contact step of letting first gas containing a second metal to be in contact with both surfaces of the metal foil in a state where the part of the metal foil is supported; and a second contact step of letting second gas containing an oxidant to be in contact with the both surfaces of the metal foil in a state where the part of the metal foil is supported.

Abstract: Pseudo-boehmite having a bulk density of about 0.05 to 0.2 g/cc, an oil absorption of about 2.5 to 6.0 cc/g, a pore volume of about 2.0 to 7.0 cc/g over a pore diameter range of 176.mu. to 0.0035.mu. and a specific surface area of about 200 to 500 m.sup.2 /g, and a process for producing the same; useful as a filler, an absorbent, a catalyst, a filtering agent and a base material for composites; prepared by mixing alkali aluminate and halohydrin together at a low temperature, heating for reaction the resulting mixture, cooling the reacting solution, separating the resulting precipitate by filtration and, if desired subjecting the precipitate to washing with an organic solvent followed by drying.