High metals content hydrolysis catalyst for use in the catalytic reduction of sulfur contained in a gas stream, and a method of making and using such composition
Disclosed is a composition useful in the hydrolysis of sulfur compounds that are contained in a gas stream. The composition comprises a calcined co-mulled mixture of psuedoboehmite, a cobalt compound, and a molybdenum compound such that the composition comprises gamma-alumina, at least 7.5 wt. % molybdenum, and at least 2.75 wt. % cobalt. The composition is made by forming into an agglomerate a co-mulled mixture pseudoboehmite, a cobalt component, and a molybdenum component followed by drying and calcining the agglomerate to provide a catalyst composition comprising gamma-alumina, at least 7.5 wt. % molybdenum, and at least 2.75 wt. % cobalt.
1. A hydrolysis process, comprising: introducing a gas stream comprising a sulfur compound selected from the group of compounds consisting of carbonyl sulfide (COS), carbon disulfide (CS 2 ), sulfur dioxide (SO 2 ), and elemental sulfur (S x ), carbon monoxide, or a combination of the sulfur compound and carbon monoxide, into a reactor that defines a reaction zone containing a catalyst composition; and contacting the gas stream with the catalyst composition in the presence of water and hydrogen, wherein the catalyst composition comprises a formed agglomerate of a comulled mixture comprising pseudoboehmite, a cobalt compound and a molybdenum compound, wherein the comulled mixture has been calcined to provide the catalyst composition comprising gamma-alumina, at least 7.5 wt. % molybdenum, and at least 2.75 wt. % cobalt, and wherein each wt. % is based on the total weight of the catalyst composition and the metal as an oxide regardless of its actual form, wherein the catalyst composition has a bimodal pore structure such that less than 6 percent of the total pore volume of the catalyst composition is contained within pores having a pore diameter greater than 10,000 Å, wherein the bimodal pore structure of the catalyst composition is further characterized such that greater than 15% and less than 60% of the total pore volume of the catalyst composition is contained within pores having a pore diameter in the range of from 50 Å to 150 Å, wherein the bimodal pore structure of the catalyst composition is further characterized such that greater than 10% and less than 50% of the total pore volume of the catalyst composition is contained within pores having a pore diameter in the range of from 1000 Å to 10,000 Å, and wherein the reaction zone is operated at reaction conditions comprising a reactor inlet temperature of less than 250 C.
2. A process as recited in claim 1 , wherein the sulfur compound is present in the gas stream at a sulfur compound concentration in the range of from 0.01 volume % to 2 volume %.
3. A process as recited in claim 2 , comprising operating the reaction zone at reaction conditions comprising a reactor inlet temperature that is in the range of from 140° C. to 250° C.
4. A process as recited in claim 3 , wherein the reduced concentration of sulfur compound in the treated gas is less than 75 ppm.