Boosting CO2 hydrogenation performance for light olefin synthesis over GaZrOx combined with SAPO-34

Highly Active Catalytic CO2 Hydrogenation to Lower Olefins via Spinel ZnGaOx Combined with SAPO‐34

“…When ZnÀ Ga (1 : 2) and SAPO-34 were combined at 370 °C, 3.0 MPa, 4800 mL/g cat /h, and a mass ratio of 1/2, the resulting CO 2 conversion was 28.52%, the C 2 This unique spinel structure not only has a high concentration of strongly alkaline adsorption sites with oxygen defects for adsorption of activated CO 2 , but also has a moderate H 2 dissociation capacity favoring CO 2 hydrogenation to HCOO* and continuous hydrogenation to CH 3 O* intermediates at high temperatures. [35][36][37] Furthermore, the structure significantly inhibits the RWGS reaction and the C 2 = À C 4 = excess hydrogenation reaction, increasing the C 2 = À C 4 = yields. Based on previous studies, [24] this work systematically investigated the structural and electronic properties of ZnGaO x , and through experiments and characterization, showed the relationship between CO 2 activation and the surface properties of ZnGaO x , achieving higher CO 2 conversion and lower olefins yield.…”

Rational Design of SAPO-34 Zeolite in Bifunctional Catalysts for Syngas Conversion into Light Olefins

“…GaZrO x oxide with a Ga/Zr atomic ratio of 1:5 was prepared by the co-precipitation method as reported in our very recent paper . Briefly, Zr­(NO 3 ) 4 ·5H 2 O and Ga­(NO 3 ) 2 ·9H 2 O were selected as metal oxide precursors, and NH 3 ·H 2 O (1.0 mol·L –1 ) was used as a precipitant.…”

“…GaZrO x oxide with a Ga/Zr atomic ratio of 1:5 was prepared by the co-precipitation method as reported in our very recent paper. 35 Briefly, Zr(NO 3 ) 4 •5H 2 O and Ga(NO 3 ) 2 •9H 2 O were selected as metal oxide precursors, and NH 3 •H 2 O (1.0 mol• L −1 ) was used as a precipitant. The pH value in the process of precipitation was kept at 7.0 ± 0.1, and the precipitate was further aged at 60 °C for 1 h. The obtained solid was dried in an oven at 110 °C and then calcined at 450 °C in air for 4 h, labeled as GaZrO x .…”

“…The effects of the template and SiO 2 /Al 2 O 3 molar ratio on the zeolite structure and surface properties were investigated. The GaZrO x oxide, which exhibits a high catalytic activity for CO 2 hydrogenation to olefins in our recent report, 35 was selected to combine with SAPO-34 to prepare the bifunctional catalyst and apply for the STO reaction. Moreover, the reaction conditions, including temperature, pressure, gashourly space velocity (GHSV), a weight ratio of SAPO-34 to GaZrO x , and the proximity of SAPO-34 and GaZrO x , were all optimized, and the structure−activity relationship was discussed.…”

Multifunctional long-lived catalysts for direct hydrogenative conversion of CO2 to liquid hydrocarbons with upscaling C5+ productivity

“…31 Several recent reports on CO 2 hydrogenation have focused on the design of multifunctional catalysts with high productivity for the selective production of high molecular weight hydrocarbons under energy-efficient catalytic conditions. [32][33][34][35][36][37] Herein, we report the development of a K-promoted Fesupported CuAl 2 O 4 mesoporous spinel oxide as an active, selective, productive, and stable multifunctional catalyst for the direct conversion of CO 2 to liquid-phase C 5+ hydrocarbons based on a rational design strategy. By changing the catalyst composition (amount of Fe and K in CuAl 2 O 4 ), a high C 5+ hydrocarbon productivity (429.4 mL g cat À1 h À1 ) was achieved with correspondingly low selectivities to CO (10.2% of the total products) and CH 4 (12.5% among the hydrocarbons excluding CO) when conducting the reaction at 320 C, 3 MPa, a H 2 /CO 2 ratio of 3, and a high gas hourly space velocity (GHSV) of 10 000 mL g cat À1 h À1 .…”