Selective Oxidation of 1,2-Propanediol to Lactic Acid Over Synergistic AuCu/TiO2 Catalysts
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This paper reported synergistic bimetallic AuCu/TiO2 catalysts for selective oxidation of 1,2-propanediol to lactic acid under very mild conditions (T < 90 °C, 1 MPa O2). The addition of Cu to monometallic Au/TiO2 catalyst leads to a twofold activity enhancement for Au catalysts (TOF: 11894 h−1) with good selectivity towards lactic acid (S > 92%). Surface characterization reveals that while AuCu forms alloy structure with larger particle size based on TEM images, strong interaction between Au and Cu species is critical for performance enhancement. According to experimental studies on the influence of 1,2-propanediol and NaOH concentration on reaction rates, it is highly possible that 1,2-propanediol is reacted following single-site Langmuir–Hinshelwood mechanism while NaOH acts as a promoter and may block surface sites under relatively higher concentration.
KeywordsBimetallic catalyst Oxidation 1,2-Propanediol Lactic acid
This work is supported by National Natural Science Foundation of China (Grant No. 21706290), Natural Science Foundation of Shandong Province (Grant No. ZR2017MB004), Innovative Research Funding from Qingdao City, Shandong Province (Grant No. 17-1-1-80-jch), “Fundamental Research Funds for the Central Universities” (Grant No. 17CX02017A) and New Faculty Start-Up Funding from China University of Petroleum (Grant No. YJ201601059).
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Conflict of interest
All authors declare that: (i) no support, financial or otherwise, has been received from any organization that may have an interest in the submitted work; and (ii) there are no other relationships or activities that could appear to have influenced the submitted work.
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