Abstract: The invention provides a gold-supporting catalyst comprising gold nanoparticles and a carrier consisting of porous ceramic obtained by firing a mixture comprising an aluminum compound, a lime component, and a plastic clay containing 1% by mass or less of feldspars and quartz, wherein the gold nanoparticles are supported in an amount of 0.01 to 10 parts by mass on the carrier based on 100 parts by mass of the carrier.

Abstract: A process for preparing molded articles of a polyimide is provided the steps of melting and extruding, at 50.degree. to 100.degree. C., a polyimide precursor composition for extrusion molding of a polyimide which includes 30 to 60% by weight of a polyimide precursor (c) obtained by reacting an aromatic tetracarboxylic dianhydride or its derivative (a) with an aromatic diamine or its derivative (b) in a good solvent of the polyimide precursor and then depositing the resultant polyimide precursor solution in a poor solvent of the polyimide precursor, 0.1 to 5% by weight of the poor solvent, and 35 to 69.9% by weight of the good solvent, and then heating the molded composition at 250.degree. to 500.degree. C. to imidate the same or its derivative (b) in a good solvent of the polyimide precursor and then depositing the resultant polyimide precursor (c) solution in a poor solvent of the polyimide precursor, 0.1 to 5% by weight of the poor solvent, and 35 to 69.