Chiyoda Chemical Engineering Construction Co., Ltd.

Chiyoda Chemical Engineering & Construction

Motoyoshi Wakabayashi

Munekazu Nakamura

Tatsuo Morimoto

Masayoshi Inooka

Masatoshi Matsuda

Masaaki Kasuya

Takeo Ono

Osamu Togari

Yoshihiro Ohguchi

Yoshihoro Ohguchi

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.

Process for the production of alumina suitable for use as a catalyst

This invention relates to a catalyst for hydrotreatment of hydrocarbons comprising one or more of metals selected from the group consisting of transition metals and metals of group IIb of the periodic table supported on sepiolite. More particularly it relates to a catalyst effective in the selective demetallization treatment of hydrocarbons.

Catalysts for demetallization treatment of _hydrocarbons supported on

Demetallation of hydrocarbons with catalysts supported on sepiolite

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Kawasaki, Japan

Motoyoshi Wakabayashi