Selective Catalytic Dehydrogenative Oxidation of Bio-Polyols to Lactic Acid |
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Authors: | Jiajie Wu Lingyun Shen Sai Duan Dr. Zhe-Ning Chen Dr. Qingshu Zheng Yaoqi Liu Dr. Zheming Sun Prof. Dr. James H. Clark Prof. Dr. Xin Xu Prof. Dr. Tao Tu |
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Affiliation: | 1. Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai, 200438 China;2. Collaborative Innovation Center of Chemistry for Energy Materials, MOE Laboratory for Computational Physical Science, Fudan University, 2005 Songhu Road, Shanghai, 200438 China;3. Green Chemistry Centre of Excellence, University of York, York, YO105DD UK |
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Abstract: | The global demand for lactic acid (LA) is increasing due to its successful application as monomer for the manufacture of bioplastics. Although N-heterocyclic carbene (NHC) iridium complexes are promising molecular catalysts for LA synthesis, their instabilities have hindered their utilization especially in commercial applications. Here, we report that a porous self-supported NHC-iridium coordination polymer can efficiently prevent the clusterization of corresponding NHC-Ir molecules and can function as a solid molecular recyclable catalyst for dehydrogenation of bio-polyols to form LA with excellent activity (97 %) and selectivity (>99 %). A turnover number of up to 5700 could be achieved in a single batch, due to the synergistic participation of the Ba2+ and hydroxide ions, as well as the blockage of unwanted pathways by adding methanol. Our findings demonstrate a potential route for the industrial production of LA from cheap and abundant bio-polyols, including sorbitol. |
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Keywords: | bio-polyols lactic acid N-heterocyclic carbene iridium complex oxidative dehydrogenation self-supporting |
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