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Shi Y, Su W, Wei X, Bai Y, Song X, Lv P, Wang J, Yu G. Carbon coated In 2O 3 hollow tubes embedded with ultra-low content ZnO quantum dots as catalysts for CO 2 hydrogenation to methanol. J Colloid Interface Sci 2023; 636:141-152. [PMID: 36623367 DOI: 10.1016/j.jcis.2023.01.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/30/2022] [Accepted: 01/02/2023] [Indexed: 01/06/2023]
Abstract
CO2 hydrogenation coupled with renewable energy to produce methanol is of great interest. Carbon coated In2O3 hollow tube catalysts embedded with ultra-low content ZnO quantum dots (QDs) were synthesized for CO2 hydrogenation to methanol. ZnO-In2O3-II catalyst had the highest CO2 and H2 adsorption capacity, which demonstrated the highest methanol formation rate. When CO2 conversion was 8.9%, methanol selectivity still exceeded 86% at 3.0 MPa and 320 °C, and STY of methanol reached 0.98 gMeOHh-1gcat-1 at 350 °C. The ZnO/In2O3 QDs heterojunctions were formed at the interface between ZnO and In2O3(222). The ZnO/In2O3 heterojunctions, as a key structure to promote the CO2 hydrogenation to methanol, not only enhanced the interaction between ZnO and In2O3 as well as CO2 adsorption capacity, but also accelerated the electron transfer from In3+ to Zn2+. ZnO QDs boosted the dissociation and activation of H2. The carbon layer coated on In2O3 surface played a role of hydrogen spillover medium, and the dissociated H atoms were transferred to the CO2 adsorption sites on the In2O3 surface through the carbon layer, promoting the reaction of H atoms with CO2 more effectively. In addition, the conductivity of carbon enhanced the electron transfer from In3+ to Zn2+. The combination of the ZnO/In2O3 QDs heterojunctions and carbon layer greatly improved the methanol generation activity.
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Affiliation(s)
- Yuchen Shi
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China; College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Weiguang Su
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China; College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China.
| | - Xinyu Wei
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China; College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Yonghui Bai
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China; College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Xudong Song
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China; College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Peng Lv
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China; College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Jiaofei Wang
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China; College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
| | - Guangsuo Yu
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China; Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China.
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