COMBINED CAPTURE AND CONVERSION OF CO2 TO METHANOL IN A POST COMBUSTION CAPTURE SOLVENT
(iEdison No. 0685901-22-0069)

Patent ID: 10611 | Status: Filed

Abstract

Herein, we have identified an efficient and selective catalyst for the condensed phase hydrogenation of captured CO2 in the presence of an advanced water-lean post combustion capture solvent, EEMPA. The catalysts commonly used for the gas phase CO2 hydrogenation caused deactivation of the capture solvent via N-methylation. We have developed and screened several heterogenous catalysts for suppressing N-methylation of the capture solvent and identified that metals, particularly noble metals, on reducible metal oxide supports such as CeO2 and TiO2 to be particularly selective for C-N cleavage to produce methanol. The most promising catalyst formulation (Pt/TiO2) was evaluated under continuous flow operation, which produced a single pass CO2 conversion of 29% with 70% selectivity to methanol at 170 degrees C. Further increase in the reaction temperature (to 190 degrees C) resulted in decrease in the methanol selectivity, however with an unprecedented single pass CO2 conversion of 86%. The high single pass conversion achieved here is important as the solvent looping strategy to get higher conversion is not economical. This is the first demonstration of integrated low temperature thermocatalytic capture and conversion of CO2 to methanol in an economically viable post-combustion CO2 capture solvent. The Technoeconomic analysis (TEA) performed on the current state of this integrated technology showed that the methanol production cost is ~$1000/mt using CO2 captured from flue gas from a 550 MW natural gas combined cycle (NGCC) plant. This cost is lower than the current renewable methanol cost of ~1600/mt.

Application Number

18/354,571

Inventors

Jiang,Yuan
Saavedra Lopez,Johnny
Kothandaraman,Jothi
Heldebrant,David J
Dagle,Robert A

Market Sector

Materials
Chemistry and Catalysts