Catalyst treatment to improve corrosion resistance
There are provided systems and processes that provide a robust α-alumina supported catalyst for the wet air oxidation or hydrolysis treatment of wastewaters having a pH of 9 or greater.
1. A wastewater treatment process comprising:
heating an alumina-supported catalyst comprising alumina in a form other than α-alumina and a catalyst deposited thereon at a temperature effective to transform at least a portion of the alumina to its α-alumina form and produce a stabilized α-alumina supported catalyst; and
subjecting a wastewater stream comprising an amount of contaminants and having a pH of 9 or greater to a wet air oxidation or hydrolysis process in the presence of the stabilized α-alumina supported catalyst to reduce an amount of the contaminants in the wastewater stream.
2. The process of claim 1 , wherein the wastewater is subjected to a hydrolysis process.
3. The process of claim 1 , wherein the wastewater is subjected to a wet air oxidation process.
4. A wastewater treatment process comprising:
heating an alumina-supported catalyst comprising alumina in a form other than α-alumina and a catalyst deposited thereon at a temperature effective to transform at least a portion of the alumina to its α-alumina form and produce a stabilized α-alumina supported catalyst; and
subjecting a wastewater stream comprising an amount of contaminants and having a pH of 9 or greater to a wet air oxidation or hydrolysis process in the presence of the stabilized α-alumina supported catalyst to reduce an amount of the contaminants in the wastewater stream, wherein the wastewater stream comprises a wastewater stream from the production of propylene oxide and styrene monomer (POSM).
5. The process of claim 4 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature greater than 1200° C.
6. The process of claim 5 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature between 1250° C. and 1350° C.
7. The process of claim 5 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature between 1200° C. and 1350° C. for at least one hour.
8. The process of claim 1 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature greater than 1200° C.
9. The process of claim 8 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature between 1250° C. and 1350° C.
10. The process of claim 8 , wherein the heating step further comprises heating the alumina-supported catalyst to a temperature between 1200° C. and 1350° C. for at least one hour.
11. The process of claim 4 , wherein the contaminants comprise an amount of chemical oxygen demand (COD).