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Tan H, Xu YP, Rong S, Zhao R, Cui H, Chen ZN, Xu ZN, Zhang NN, Guo GC. Enhanced metal-support interaction between Pd and hierarchical Nb 2O 5via oxygen defect induction to promote CO oxidative coupling to dimethyl oxalate. NANOSCALE 2021; 13:18773-18779. [PMID: 34747962 DOI: 10.1039/d1nr03370k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Production of ethylene glycol from coal is a particularly interesting route as it is an economic alternative to the petrochemical-based route. In this process, effectively generating dimethyl oxalate (DMO) is a crucial step by CO oxidative coupling reaction under Pd-based catalysts. However, the aggregation of Pd species over the support is still an issue that relates to the deterioration of catalytic activity and stability. To this end, enhancing the metal-support interaction is urgently required. In this work, hierarchical Nb2O5 (H-Nb2O5) microspheres with abundant oxygen defects were synthesized to anchor the Pd species thus promoting the electron transfer between Pd species and Nb species associated with the generation of interfacial Pd-NbOx sites. Besides, the thinned electron density of Pd species resulting from the electron-withdrawing effect of Nb species is beneficial for activating the adsorbed CO molecules, leading to superior catalytic activity. The Pd/H-Nb2O5 catalyst exhibited 63.1% of CO conversion (theoretical maximum conversion: 64.3%) and 92.9% of DMO selectivity, with a DMO weight time yield of 1297.9 g kgcat.-1 h-1, and remained robust even after 50 h of time on stream evaluation. Current work provides a deep insight into the CO activation mechanism and helps improve the catalytic stability by boosting interfacial electron interaction via oxygen defects induction, and also sheds light on the design and synthesis of high-performance catalysts in other heterogeneous catalysis fields.
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Affiliation(s)
- Hongzi Tan
- School of Chemistry & Chemical Engineering, Shandong University of Technology, Zibo, Shandong 255049, P. R. China.
| | - Yu-Ping Xu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
- University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Siteng Rong
- School of Chemistry & Chemical Engineering, Shandong University of Technology, Zibo, Shandong 255049, P. R. China.
| | - Rongrong Zhao
- School of Chemistry & Chemical Engineering, Shandong University of Technology, Zibo, Shandong 255049, P. R. China.
| | - Hongyou Cui
- School of Chemistry & Chemical Engineering, Shandong University of Technology, Zibo, Shandong 255049, P. R. China.
| | - Zhe-Ning Chen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
| | - Zhong-Ning Xu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
| | - Ning-Ning Zhang
- School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252000, P. R. China
| | - Guo-Cong Guo
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
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