Selective Oxidation of Glycerol to Glyceraldehyde with H 2 O 2 Catalyzed by CuNiAl Hydrotalcites Supported BiOCl in Neut
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Selective Oxidation of Glycerol to Glyceraldehyde with H2O2 Catalyzed by CuNiAl Hydrotalcites Supported BiOCl in Neutral Media Xiaoli Wang1 · Gongde Wu1 · Xuelan Zhang2 · Dengfeng Wang2 · Jianyang Lan1 · Jieyao Li1 Received: 5 December 2018 / Accepted: 21 January 2019 © Springer Science+Business Media, LLC, part of Springer Nature 2019
Abstract CuNiAl hydrotalcites supported BiOCl were prepared by one-step synthesis for the selective oxidation of glycerol to glyceraldehyde with H2O2 as oxidant. The prepared catalysts were found to be efficient due to the synergetic catalysis of surface oxygen vacancies, active Cu2+ ions in the HT-lattice and abundant surface –OH groups of catalysts. The optimal glycerol conversion could reach 75.4% with 82.4% of the selectivity to glyceraldehyde. Moreover, the catalyst could be reused at least 6 times, and a possible reaction mechanism was also proposed. Graphical Abstract Inexpensive and environmentally friendly BiOCl/CuNiAl-HTs were synthesized by one-step for the highly selective oxidation of glycerol to glyceraldehyde. The glycerol conversion could reach 75.4% with 82.4% selectivity to GLAD. Such a highly efficient catalytic performance could be attributed to the synergistic effect of oxygen vacancies and the coordination of glycerol on Bi3+ in the supported BiOCl catalyst.
Keywords Glycerol · Selective oxidation · Glyceraldehyde · Hydrotalcite · Bismuth oxychloride
* Gongde Wu [email protected] * Dengfeng Wang [email protected] 1
School of Environment and Technology, Nanjing Institute of Technology, Nanjing 211167, People’s Republic of China
College of Chemistry, Chemical Engineering and Materials Science, Zaozhuang University, Zaozhuang 277160, People’s Republic of China
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1 Introduction Glycerol (GLY) is a low-cost and abundant feedstock as the by-product of biodiesel industry [1–4]. Its production has dramatically increased to 1.2 Mt in 2012, and is expected to rise to 2.5 Mt in 2020 [5]. However, it is still a key challenge to develop efficient processes for converting GLY into commercially valued products [6]. The selective oxidation of GLY could produce numerous value-added chemicals
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such as 1,3-dihydroxyacetone (DHA), glyceraldehyde (GLAD), glyceric acid (GLYAC), glycolic acid (GLYC), hydroxypyruvic acid (HPA), tartronic acid (TAR) and oxalic acid (OXAL) [6]. Among them, GLAD is an important protective agent in medicine for blood glucose and also a key dye intermediate in printing and dyeing industry. The conventional methods for producing GLAD often used strong oxidants with poor selectivity [7]. The strong oxidants were often need to start the oxidation reaction of GLY, while the poor selectivity of GLAD could be attributed to the presence of side-reaction such as the isomerization of GLAD to DHA and the over oxidation of GLAD to GLYAC. Therefore, it is highly significant to exploit high efficient catalysts for the selective oxidation of GLY to GLAD using the clean oxidants of O2 or H2O2. It was known that the GLY oxida
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