(235g) Effect of CO2 Source and Concentration on the Catalyst Performance and Economics of Ethane Oxidative Dehydrogenation to Ethylene

Samad, J. E., Southern Research
Goyal, A., Southern Research
Southern Research, in partnership with DOE/NETL is developing a novel, low-cost mixed oxide catalyst for low temperature ethylene production process using CO2, notably from coal-fired flue gas and readily available, low cost ethane as raw materials. The proprietary catalyst has been screened from a series of rationally synthesized catalysts and exploits CO2 as a ‘soft’ oxidant to dehydrogenate ethane to ethylene at high selectivity (oxidative dehydrogenation). The catalyst has been tested using two different CO2 concentration levels in the feed: (a) diluted flue gas (12-14% CO2) and (b) captured CO2 (95%). Multiple cycle laboratory scale catalytic runs have been conducted using pure ethane and CO2 at these two concentration levels. Each cycle constituted 7 hr of continuous run and 1 hr of regeneration. The catalyst has also been tested using several flue gas impurities, such as, SOx, NOx, O2, H2O at levels present in environmentally regulated coal fired flue gas. A techno-economic and life cycle assessment has been conducted using the laboratory scale results and considering two CO2 concentration levels mentioned above. The economics looks competitive even with partial co-product (CO) credit. CO2 cost was found to be one of the major drivers in the captured CO2 case. The LCA study showed up to 57% reduction in GHG emission compared to the state-of-the-art alternative case. The presentation will highlight the impacts of CO2 source/concentration on catalyst performance, economics and life cycle assessment.