초록 ▼

A fixed catalyst bed comprises: (a) a support layer of substantially spherical alumina-containing particles containing about 0-2 weight-% of a promoter element, said particles having been prepared by heating an alumina-containing starting material at a temperature of about 500°-900°C. for a period o

A fixed catalyst bed comprises: (a) a support layer of substantially spherical alumina-containing particles containing about 0-2 weight-% of a promoter element, said particles having been prepared by heating an alumina-containing starting material at a temperature of about 500°-900°C. for a period of time of at least 10 minutes, and (b) at least one layer of hydrotreating catalyst particles.

대표청구항 ▼

A fixed catalyst bed comprising (a) at least one layer of substantially spherical alumina-containing particles resistant to the detrimental effect of water during hydrotreating, and (b) at least one layer of hydrotreating catalyst particles comprising a refractory inorganic carrier material and at l

A fixed catalyst bed comprising (a) at least one layer of substantially spherical alumina-containing particles resistant to the detrimental effect of water during hydrotreating, and (b) at least one layer of hydrotreating catalyst particles comprising a refractory inorganic carrier material and at least one hydrogenation promoter selected from the group consisting of transition metals belonging to the Groups IIIB, IVB, VB, VIB, VIIB, VIII, IB, and IIB of the Periodic Table and compounds of said transition metals; wherein said substantially spherical alumina-containing particles in layer (a) resistant to the detrimental effect of water during hydrotreating have been prepared by a process comprising the step of heating a starting material of substantially spherical alumina-containing particles having an initial average particle size in the range of from about 0.05 to about 1.5 inches, an initial surface area, determined by the BET method employing nitrogen, of at least about 20 m2/g, an initial pore volume, determined by mercury intrusion porosimetry at a pressure ranging from 0 to 50,000 psig, of at least about 0.1 cc/g, an initial normalized crush strength of at least 150 lb. per inch diameter per particle, an initial content of Na of less than about 2.0 weight-%, and an initial content of Al2O3 of at least about 80 weight-%, wherein said heating of said starting material has been carried out at a temperature in the range of from about 500°to about 900°C. for a period of time of at least 10 minutes, under such heating conditions as to increase the portion of the pore volume in pores having a diameter in the range of from about 40 to about 200 Angstroms and to increase the retention of crush strength, measured after exposure for about 100 hours to a liquid hydrocarbon-containing stream which contains at least about 0.5 weight-% sulfur, under hydrotreating conditions at about 2250 psig total pressure, about 110 psig partial pressure of steam and about 700°F.; wherein a layer (a) of said substantially spherical alumina-containing particles is placed as support layer below at least one layer (b) of said hydrotreating catalyst particles; wherein said substantially spherical alumina-containing particles in said support layer (a) are promoted with at least one compound of at least one element selected from the group consisting of Y, La, Ce, Ti, Zr, Hf, Cr, Mo, W, Mn, Re, Ni, Co, Cu, Zn and P at a level of from about 0.1 to about 2.0 weight percent of said at least one element; and wherein said hydrotreating catalyst particles contain said at least one hydrogenation promoter at a level which is effective for lowering the concentration of sulfur and metals present in a hydrocarbon-containing feed stream under effective hydrotreating conditions.