초록 ▼

The removal of metals, especially vanadium, from spent hydrofining catalyst is accomplished by a two-step process. Treatment with a gaseous sulfur-containing reagent brings the metals to the surface of the catalyst and converts them to sulfides, which are then efficiently removed by contact with a h

The removal of metals, especially vanadium, from spent hydrofining catalyst is accomplished by a two-step process. Treatment with a gaseous sulfur-containing reagent brings the metals to the surface of the catalyst and converts them to sulfides, which are then efficiently removed by contact with a heteropoly acid such as molybdophosphoric acid. Treatment of deactivated hydrodesulfurization catalysts such as Co-Mo supported on alumina by this process results in substantially complete regeneration of catalytic activity.

대표청구항 ▼

An improved process for regenerating spent hydrofining catalysts which comprises contacting spent catalyst with a gaseous sulfur-containing reagent having a partial pressure of sulfur of at least about 0.01 atmospheres at a temperature of up to about 650°C., followed by contacting the catalyst with

An improved process for regenerating spent hydrofining catalysts which comprises contacting spent catalyst with a gaseous sulfur-containing reagent having a partial pressure of sulfur of at least about 0.01 atmospheres at a temperature of up to about 650°C., followed by contacting the catalyst with an aqueous solution of a heteropolyacid, impregnating with a water soluble cobalt or nickel salt and calcining at a maximum temperature of about 450°C. The process of claim 1 in which the heteropoly acid contains about 1 to 50 wt. % hydrogen peroxide. The process of claim 1 in which the heteropoly acid is represented by the general formula Hx(YM12O40), where Y is at least one element selected from the group consisting of phosphorus, silicon, titanium, germanium, arsenic, zirconium, thorium and cerium, M is at least one element selected from the group consisting of molybdenum, tungsten, niobium and tantalum and x is 3 when Y is pentavalent and 4 and when Y is tetravalent.