Catalysts & Chemicals Industries Co., Ltd.

Takemitu Yano

Hidehiro Higashi

Shin-ichi Yoshida

A catalytic composite of Group VIB metal, Group VIII metal and a porous alumina carrier material is manufactured by controlling a water of hydration of pseudo-boehmite contained in an amorphous alumina hydrate slurry in the range of 1.20-1.50 mols per mol of Al.sub.2 O.sub.3 ; forming an alumina hydrate obtained from this slurry into alumina particles and drying; and then calcining the alumina particles in a steam-containing atmosphere to thereby obtain a porous alumina carrier material, the resulting porous alumina carrier material being subsequently incorporated with catalytically effective amounts of a Group VIB metal compound and a Group VIII metal compound.

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Kitakyushu, Japan

Takemitu Yano