Hydrotreating catalyst and process of manufacture
AssigneeToa Nenryo Kogyo Kabushiki Kaisha
InventorsIkuo Akizuki, Hiroshi Kaya, Shohei Okano, Nobuo Otake, Keiji Kumagai, Yoshihito Kaneko
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Abstract
Hydrotreating catalyst comprising silica/alumina or silica/alumina-containing carrier comprising 2 to 35 wt. % silica and Group VIII and/or Group VIB metals as hydrogenation active components is prepared by first step impregnation with at least one Group VIII metal and a second step impregnation with at least one Group VIB metal. Preferably the impregnation is via ion exchange using a complex salt, preferably an ammine or amine salt, of the metal. The carrier is characterized by a maximum of pores in 30 to 100 .ANG. range and a minimum of pores in 0 to 30 .ANG. and in 300 .ANG.+.
Claims7
A process for producing a hydrotreating catalyst which comprises the following steps:
- (a) obtaining a carrier formed of silica/alumina or a silica/alumina-containing substance, said carrier comprising silica in an amount of 2 to 35 wt.%;
- (b) immersing said carrier initially in a solution of an amine complex salt of at least one Group VIII metal so as to obtain an impregnated carrier containing between about 0.5 to 20 wt. %, based on the oxide, of said Group VIII metal;
- (c) air drying and calcining said impregnated carrier of step (b);
- (d) immersing said air-dried and calcined carrier in a solution of a salt of at least one Group VIB metal so as to obtain an impregnated carrier comprising between about 5 to 30 wt. %, based on the oxide, of said Group VIB metal.
A process for producing hydrotreating catalyst which comprises:
- (a) impregnating a carrier comprised of silica/alumina or a silica/alumina-containing composition, which carrier comprises from 2 to 35 wt. % silica, with at least one Group VIII metal, said Group VIII metal amine complex salt being contained on said carrier in an amount from about 0.5 to 20 wt. % in terms of its oxide;
- (b) further impregnating the Group VIII metal-containing carrier of step (a) above with at least one Group VIB metal, said Group VIB metal being contained on said carrier in an amount from about 5 to 30 wt. % in terms of its oxide, wherein the carrier of both (a) and (b) above is characterized by the following pore distribution:
- (i) the volume of pores having a diameter in the range of 30 to 100 A is at least 70% of the volume of pores having a diameter in the range of 0 to 150 A;
- (ii) the volume of pores having a diameter in the range of 100 to 300 A is less than about 30% of the volume of pores having a diameter in the range of 0 to 300 A (the pore volume in (i) and (ii) being determined by the nitrogen adsorption method);
- (iii) the volume of pores having a diameter in the range of 150 to 150,000 A as measured by the mercury porosimetry method is about 0.005 to 0.25 ml/g;
- (iv) the volume of pores having a diameter in the range of 300 to 15,000 A as measured by the mercury porosimetry method is less than 0.05 ml/g;
- (v) the volume of pores having a diameter in the range of 150 to 2000 A as measured by the mercury porosimetry method is less than about 0.01 ml/g;
- and
- (vi) the volume of pores having a diameter in the range of 0 to 600 A as measured by the nitrogen adsorption method is in the range of about 0.30 to 0.70 ml/g.
Dependencies are inferred from the claim text.