Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1979-08-15
1981-02-03
Carter, Herbert T.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
252463, 423625, 423628, 423630, 423631, C01F 702, C01F 734
Patent
active
042488524
ABSTRACT:
Improved .gamma.-alumina suitable for use as a catalyst carrier having high mechanical strength, a large specific surface area, and a substantially uniform pore size distribution in a relatively small portion of the pore size range below 500 A. Said alumina is produced by first establishing a seed aluminum hydroxide hydrogel having a pH of between 6 and 10 and then repetitively and sequentially adding an aluminum compound to adjust the pH to less than 5 or more than 11 to dissolve crystallites of aluminum hydroxide followed by addition of a neutralizing agent to return the hydrogel to the pH range from about 6 to 10 to cause pseudo-boehmite crystallites to grow. After a sufficient number of repetitions of said sequential addition, sparse aggregates of crystallites of the desired structure are formed. These are dried and calcined to produce the said alumina.
REFERENCES:
patent: 3468625 (1969-09-01), Nightingale
patent: 3898322 (1975-08-01), Leach
patent: 4098874 (1978-07-01), Mitachi et al.
patent: 4172809 (1979-10-01), Triki
patent: 4175118 (1979-11-01), Wasserman et al.
Nakamura Munekazu
Ono Takeo
Togari Osamu
Wakabayashi Motoyoshi
Carter Herbert T.
Chiyoda Chemical Engineering & Construction Co. Ltd.
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