Highly active MIL-68(In)-derived In2O3 hollow tubes catalysts to boost CO2 hydrogenation to methanol. (15th February 2023)

• Record Type: Journal Article
• Authors: Shi, Yuchen; Su, Weiguang; Wei, Xinyu; Song, Xudong; Bai, Yonghui; Wang, Jiaofei; Lv, Peng; Yu, Guangsuo
• Is Part Of: Fuel. Volume 334(2023)Part 2
• Publication Date: 2023-02-15
• Subjects: CO2 hydrogenation to methanol -- MIL-68(In) -- In2O3 -- Hollow tube -- NaOAc; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.126811
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: MIL-68(In)-derived In2 O3 with different morphologies and sizes was applied to CO2 hydrogenation to methanol. Self-assembled MIL-68(In)-derived perfect In2 O3 hollow tubes were successfully synthesized by appropriate 0.5 M NaOAc. The perfect In2 O3 hollow tube composed of ordered arranged nanoparticles was most beneficial to generate of oxygen vacancies. The more perfect and regular the structure of In2 O3 hollow tubes, the higher the methanol formation activity. Abstract: MIL-68(In)-derived In2 O3 hollow tubes with different morphology and size using MIL-68(In) as a template were prepared at different NaOAc concentrations and applied to CO2 hydrogenation to methanol. The size of a series of MIL-68(In) gradually decreased with increasing NaOAc concentration. Too large or small diameter of MIL-68(In) (NaOAc at 0.2 M or 1 M) led to the collapse of corresponding derivative In2 O3 tubular structure and only haphazardly accumulated In2 O3 nanoparticles were retained. However, the In2 O3 hollow tubular-like structure could be obtained when NaOAc concentrations were in the range of 0.4 M to 0.65 M. Interestingly, the self-assembly MIL-68(In)-0.5 M-derived In2 O3 with the most regular and perfect hollow tube structure was composed of ordered arrangement of In2 O3 nanoparticles at 0.5 M NaOAc, which exhibited much higher methanol synthesis performance than that of other In2 O3 catalysts. The lowest surface reduction temperature led to oxygen vacancies easily exposed on In2 O3 -0.5 M hollow tube surface. The space confinement effect further enhanced the reaction efficiency of oxygen vacancies, and adsorption capacity of CO2 was enhanced to improve the methanol yield. It achieved a CO2 conversion of 14.0%, while methanol selectivity remained at 65%. The space-time yield was up to 1.07 gMeOH h -1 gcat -1, showing excellent methanol activity.