FIELD: hydrocarbon processing.
SUBSTANCE: method for treating a gaseous stream in a waste gas treatment process, the method comprising contacting the gaseous stream with a catalyst that has previously been used in a hydrotreating process, and which has been reactivated in a reactivation process before contacting the gaseous stream in a waste gas treatment process, wherein the gaseous stream comprises one or more sulphur-containing substances selected from the group consisting of elemental sulphur (Sx), sulphur dioxide (SO2), carbonyl sulphide (COS) and carbon disulphide (CS2), and wherein the gaseous stream is contacted with a reactivated catalyst in the presence of hydrogen (H2) one or more sulphur-containing substances are converted to hydrogen sulphide (H2S), wherein the catalyst comprises either cobalt and molybdenum supported on alumina or nickel and molybdenum supported on alumina, and wherein the reactivation process involves regeneration or reduction, and wherein the regeneration comprises heating the catalyst in an oxygen-containing atmosphere at a temperature from 300°C to 500°C for 30 minutes or more, and wherein the reduction involves impregnation of the catalyst with a solution containing a chelating agent and drying the catalyst at a temperature from 50° to 300°C. The invention also relates to a method for forming a reactivated catalyst for a waste gas treatment process.
EFFECT: improved efficiency of the reduced catalyst in removing sulphur from hydrocarbon streams.
20 cl, 10 dwg, 4 ex
