Bifunctional catalyst GaO-mZrO/SAPO-34 for CO hydrogenation: GaO-mZrO improving light olefins

• Published in: Catalysis science & technology Vol. 14; no. 13; pp. 3652 - 3659
• Main Authors: Lv, Xia, Cheng, Denghui, Shou, Xiaoke, Liu, Jichang, Xu, Haitao
• Format: Journal Article
• Published: 01.07.2024
• ISSN: 2044-4753; 2044-4761
• DOI: 10.1039/d4cy00445k

CO 2 hydrogenation to light olefins is key for reducing environmental emissions and creating sustainable energy. Bifunctional oxide-zeolite (OX-ZEO) catalysts are widely used in this area. Metal oxides, crucial for CO 2 adsorption and H 2 dissociation, need careful selection and optimization. This paper presents a bifunctional catalyst where Ga 2 O 3 is loaded onto mZrO 2 (monoclinic zirconia) (Ga 2 O 3 -mZrO 2 ) using citric acid complex method and combined with SAPO-34. Our study demonstrates that the loading method can significantly improve the adsorption capacity of the catalyst for CO 2 and had demonstrated impressive catalytic performance compared to common preparation methods. Further, Ga 2 O 3 -mZrO 2 , in comparison to Ga 2 O 3 loaded onto tZrO 2 (tetragonal zirconia) (Ga 2 O 3 -tZrO 2 ), has a stronger ability to produce light olefins. The catalyst achieves 84.1% selectivity for C 2 = -C 4 = , 20.2% CO 2 conversion, and 45.3% CO selectivity, remaining stable over 100 hours. This offers a novel method for designing highly active Zr-based oxides for effective CO 2 conversion. This study synthesized Ga 2 O 3 -mZrO 2 /SAPO-34 for CO 2 hydrogenation to light olefins, demonstrating the efficacy of citric acid complexation and mZrO 2 support. Achieving 84.1% C 2 = -C 4 = selectivity, it offers a novel strategy for active oxide preparation.