期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 9, 期 18, 页码 4909-4919出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cy01154d
关键词
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资金
- Fundamental Research Funds for the Central Universities [18CX02130A, 18CX02014A, 18CX06067A, 27R1804029A]
- National Science Foundation of China [21706290, 21606254]
- Key Research and Development Plan of Shandong Province [2017GSF17126]
- Postgraduate Innovation Engineering [YCX2019030]
- Natural Science Foundation of Shandong Province [ZR2017MB004]
- Independent Innovation Foundation of Qingdao [17-1-1-18-jch]
Optimizing the electronic coupling in heterogeneous catalysts by tuning metal-metal interactions remains a significant challenge. Herein, we report unique bimetallic PtCo/MCM-41 catalysts prepared by in situ doping Co species into MCM-41 for selective oxidation of glycerol to glyceric acid in base-free medium. Surface characterization using H-2-TPR, HAADF-STEM, HRTEM, XPS and DFT calculation confirmed that the synergy between Pt and Co significantly improves the catalytic performance. Specifically, decreasing the Si/Co molar ratio up to a point decreases the particle size and improves electron transfer from Co to Pt within the bimetallic nanoparticles, leading to a volcanic-shaped relationship between the Si/Co ratio and the catalytic performance. The PtCo/MCM-41 catalyst with a Si/Co ratio of 200 was found to exhibit superior selectivity for glyceric acid (85.2%), excellent catalytic activity (TOF: 658.6 h(-1)) and stability in base-free medium. The identification of unique active sites at Pt-Co interfaces in this study should assist in the rational design of novel catalytic materials for efficient conversion of bio-derived substrates to value-added products under mild conditions.
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