PATENT

3619. ----- [STEINKOHLEN-BERGWERK “RHEINPREUSSEN”].  [Use and Production of Carbon  Monoxide.]  German Patent Appl. St. 60,623, PA 250-501, filed Apr. 1, 1941 (Cl. IV d-12 o).  FIAT Reel B-196, frames 852-861; PB 83,253.

Use is specified of Fe oxides as catalysts prepared from ferric salts in states of crystallization that lie between the state of amorphicity to X-ray diffraction and the state where the half width of the Debye-Sherer lines is at least 10% greater than the diameter of the specimen and where the ratio of the integrated intensities of the 113 and 226 lines is at least 2.  In preparing the active Fe oxides, they are precipitated from the salt solutions and are dried in the temperature range 0°-300° in such a manner that that for each respective drying temperature a corresponding maximum drying time is not exceeded.  For example, the drying time at 20° should not exceed 1,000 hr., at 50° not more than 80 hr., at 100° not more than 35 hr., at 200° not more than 8hr., and 300° not more then 2 hr.  Furthermore, they may be formed by the thermal decomposition of ferric salts or hydroxides at temperatures at most 400° and in time less than 30 min., preferably at 250°-300° and in 20-100 sec.

-----. See abs. 1897, 1899, 1901, 1902, 1903, 1904, 1905, 1906, 1907, 1908, 1909, 1910, 1911, 1912.