(650a) Direct CO2 Hydrogenation to Light Olefins over a Tandem Catalyst Composed of YSZ-Supported in2O3 and SAPO-34
AIChE Annual Meeting
2021 Annual Meeting
Catalysis and Reaction Engineering Division
CO2 Upgrading: Electrochemical Conversion, Hydrogenation, and Thermal Upgrading (Virtual)
Monday, November 15, 2021 - 8:00am to 8:18am
In this work, we have prepared a tandem catalyst composed of YSZ (yttria-stabilized zirconia)-supported In2O3 and SAPO-34 for direct CO2 hydrogenation to light olefins. Our results show that the light olefins selectivity for the In2O3/ZrO2//SAPO-34 decreases from 9.7% to 4.2%, while CO selectivity increases up to 91.8% during 45 h of reaction. However, the developed In2O3/YSZ//SAPO-34 tandem catalyst presents steady light olefins selectivity of 11.9% producing a C2=âC4= yield of 0.997 mmol hâ1 gâ1 throughout the reaction. The stable performance of the YSZ-supported catalyst can be explained by higher oxygen vacancy concentration and stronger metalâsupport interaction compared to the regular ZrO2-supported In2O3. YSZ-supported In2O3 can prevent In species from hydroxylation and overreduction, stabilizing the active sites. However, In2O3 supported on ZrO2 presents a decline in light olefins production with time, because water produced in RWGS can facilitate indium hydroxide formation at the reaction temperature of 693 K.