Instituto Mexicano Del Petroleo

Maria Teresa Gómez Pérez

Alicia Del Rayo Jaramillo Jacob

Roberto Garcia De León

Blanca Lucía Medellín Rivera

Maria Teresa Cortez De La Paz

Gonzalo Hernández Tapia

Leonardo Díaz García

Gonzolo Hernández Tapia

Leonardo Díaz Garcia

Blanca Lucia Medellín Rivera

Maria Del Rosario Socorro Luna Ramírez

María Del Rosario Socorro Luna Ramírez

According to this invention, a Ni&#x2014;Mo&#x2014;W trimetallic catalyst supported on porous alumina is obtained that shows very high activity for hydrotreating (HDT) of gasoils, particularly deep hydrodesulfurization (HDS) and hydrodesnitrogenation (HDN) of straight run gasoil in conditions of moderate pressure. When the catalyst is applied to HDT of diesel, the NiMoW catalyst exhibits high catalytic activity. The content of sulfur and nitrogen in the resulting diesel can be reduced from 13,200 to 10 ppm and nitrogen from 360 ppm to less than 1 ppm, under moderate pressure, temperature and space-velocity (LHSV) similar to those of an industrial unit. The catalytic composition, of trimetallic type, is prepared from an alumina support of high surface area to which a solution containing a metal precursor of an element of group VIB is added, followed by other solution that contains one of the precursors of the active metallic phase, a solution containing another of the precursors of the active metallic phase from group VIB, a metal promoter of group VIII and an additive promoter of acidity from group VB, and finally another solution containing a metal of group VIB, a metal of Group VIII and an organic compound, the used route promotes the preferential formation of well dispersed structures of the used metals on the support of porous alumina, less refractory to sulfidation, with high stacking and short lengths of metal sulfides formed in the resulting hydrodesulfurization catalyst. In the formulation, at least a percentage, but not all the Mo is replaced by W, in a Mo/W molar ratio of 0.6 to 2.0.

Procedure to prepare a supported trimetallic catalyst for production of ultra low sulfur diesel and its application

The present invention is an in-situ cleaning procedure for the recovery of catalytic activity of a based alumina HDS catalyst, molybdenum, nickel coated coke and contaminants and it has an HDS activity seriously diminished. The catalyst under study had between 13 and 18 wt % total carbon. Reformate, half the total volume, industrial toluene=35 volume % and Iso-propylic alcohol, 15 volume %, in order to reactivate a deactivated catalyst, a solvent mixture with the following volumetric ratio is prepared. Or it can also be used only reformate (100% volume). The solvent mixture is passed using a LHSV of 2 hr&#x2212;1 for 72 hours at 50&#xb0; C. or also using a recirculating three 24-hour cycles at 50&#xb0; C. Option lasts 24 hours pure reformate LHSV=2h&#x2212;1 to 50&#xb0; C. The washed catalyst is fed back to the load reaction conditions maintained for 36 hours at 340&#xb0; C., to initiate HDS activity balances. During this treatment oxides of molybdenum and nickel in the active phase are re-sulfided by increasing the HDS activity. The In-Situ Cleaning procedure to reactivate deactivated hydrotreating catalysts used to partially remove the carbon and increase the active phase of molybdenum di-sulphide, and also retrieve specific area, and hydrogenation sites that promote higher hydrodesulfurization activity of gasoil after this treatment.

In-situ washing procedure to recover the catalytic activity of a deactivated hydrodesulfurization catalyst

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Mexico City, Mexico

Maria Teresa Gómez Pérez