| The freshly precipitated tantalic acid was soluble in a hot oxalic acid aqueous solution, and it was quite stable against hydrolysis. |
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| The catalyst has a support of niobic acid, tantalic acid or a mixture of niobic acid and tantalic acid or a support containing such acids. |
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| The experimental results have shown proposed constructive solutions to accomplish electron-ion powder heating with following particles deformation at a tantalic target. |
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| Process for the preparation of aromatic amines, alkylated on the N-atom, from aromatic amines and lower alcohols, characterized in that the reaction is carried out in the presence of niobic acid or tantalic acid. |
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