Regulating the competitive reaction pathway in glycerol conversion to lactic acid/glycolic acid selectively

Xu, Shuguang; Qing, Tian; Yuan, Xiao; Zhang, Wenyu; Liao, Shengqi; Li, Jianmei; Hu, Changwei

doi:10.1016/j.jcat.2022.07.003

Cited by 33 publications

(9 citation statements)

References 53 publications

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“…59 To confirm the advantage of the Au/CeMnO 3 catalyst in glycerol−GLYHD− GLYA conversion, the contrast experiment with GLYHD as the substrate was employed over Au/CeMnO 3 and Au/CeO 2 catalysts (Figure S9) under the conditions of GLYHD solution (50 mM), GLYHD/Au = 80, 1 atm O 2 , NaOH/GLYHD = 2, and temperature of 90 °C. Remarkably, the strong base NaOH has a significant promoting effect on the conversion of GLYHD into LA, 60 and the major product is LA over the Au/CeO 2 catalyst. Instead, as high as 30 mM GLYA is obtained from GLYHD at the first 2 min of the reaction over Au/CeMnO 3 , indicating that the GLYHD molecules are more strongly adsorbed on Au/CeMnO 3 , which benefits the conversion of GLYHD to GLYA.…”

Section: Glycerol Oxidation Performancementioning

confidence: 99%

Stable and Active Au Catalyst Supported on CeMnO₃ Perovskite for Selective Oxidation of Glycerol

Jiang

Zhang

et al. 2023

Inorg. Chem.

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The selective oxidation of glycerol holds promise to transform glycerol into value-added chemicals. However, it remains a big challenge to achieve satisfactory selectivity toward the specific product at high conversion due to the multiple reaction pathways. Here, we prepare a hybrid catalyst via supporting Au nanoparticles on CeMnO3 perovskite with a modest surface area, achieving promoted conversion of glycerol (90.1%) and selectivity of glyceric acid (78.5%), which are much higher than those of CeMnO x solid-solution-supported Au catalysts with larger surface area and other Ce-based or Mn-based Au catalysts. The strong interaction between Au and CeMnO3 perovskite facilitates the electron transfer from the B-site metal (Mn) in the CeMnO3 perovskite to Au and stabilizes Au nanoparticles, which results in the enhanced catalytic activity and stability for glycerol oxidation. Valence band photoemission spectral analysis reveals that the uplifted d-band center of Au/CeMnO3 promotes the adsorption of the glyceraldehyde intermediate on the catalyst surface, which benefits further oxidation of glyceraldehyde into glyceric acid. The flexibility of the perovskite support provides a promising strategy for the rational design of high-performance glycerol oxidation catalysts.

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Section: Glycerol Oxidation Performancementioning

confidence: 99%

Stable and Active Au Catalyst Supported on CeMnO₃ Perovskite for Selective Oxidation of Glycerol

Jiang

Zhang

et al. 2023

Inorg. Chem.

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“…This demonstrated the promoting role of base in glycerol conversion. Based on the results in our previous work, [56] it was assumed that NaOH was possibly responsible for the activation of glycerol via abstracting the H of ‐OH at the terminal carbon by OH − , resulting in the formation of glyceraldehyde intermediate with the assistance of O 2 . CuO species cooperating with NaOH then contributed to promote C2−C3 cleavage in glyceraldehyde via retro‐aldol reaction, yielding glycolaldehyde as the precursor of GcA.…”

Section: Resultsmentioning

confidence: 99%

Glycerol Valorization Towards Glycolic Acid Production Over Cu‐Based Biochar Catalyst

et al. 2022

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Glycerol valorization towards high‐value chemicals is of particular importance to increase the value chain of biodiesel production. In this study, the catalytic activity of a series of cheap Cu‐based catalysts for glycerol conversion is investigated. Cu supported on activated carbon (AC, obtained through carbonization of coconut shell) exhibits outstanding catalytic activity for the selective conversion of glycerol into glycolic acid (GcA) in O2 atmosphere, affording up to 68.3 % GcA yield. The combination of experimental results with theoretical calculations reveals that glyceraldehyde is the key reaction intermediate. The high specific surface area and surface oxygenated groups of AC enable the formation of CuO nanoparticles with small size and uniform dispersion. In addition, the surface oxygen vacancy on Cu/AC might help to activate reaction intermediates, and the electron transfer from Cu to AC facilitates the oxidation of glycerol to GcA. Cu loaded onto AC also significantly inhibits C−C breakage to generate formic acid as a byproduct. This work might aid the development of approaches for glycerol application and afford profitable possibilities for sustainable biodiesel.

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“…Moreover, trace amount of AA was observed due to quick cracking of glyceraldehyde or DHA. Therefore, the conversion of cellulose to GA involved the depolymerization or hydrolysis of cellulose into glucose in the presence of Brønsted acidity, retro-aldol reactions of glucose to produce glycolaldehyde and erythrose, and then glycolaldehyde further oxidized into GA [ 41 , 51 , 52 ]. In previous reports, the heteropolyacid catalyst gave a GA yield of about 49.3% together with an HMF yield of 15% for the reaction.…”

Section: Resultsmentioning

confidence: 99%

Bismuth-Decorated Beta Zeolites Catalysts for Highly Selective Catalytic Oxidation of Cellulose to Biomass-Derived Glycolic Acid

Wang

et al. 2022

IJERPH

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Catalytic conversion of cellulose to liquid fuel and highly valuable platform chemicals remains a critical and challenging process. Here, bismuth-decorated β zeolite catalysts (Bi/β) were exploited for highly efficient hydrolysis and selective oxidation of cellulose to biomass-derived glycolic acid in an O2 atmosphere, which exhibited an exceptionally catalytic activity and high selectivity as well as excellent reusability. It was interestingly found that as high as 75.6% yield of glycolic acid over 2.3 wt% Bi/β was achieved from cellulose at 180 °C for 16 h, which was superior to previously reported catalysts. Experimental results combined with characterization revealed that the synergetic effect between oxidation active sites from Bi species and surface acidity on H-β together with appropriate total surface acidity significantly facilitated the chemoselectivity towards the production of glycolic acid in the direct, one-pot conversion of cellulose. This study will shed light on rationally designing Bi-based heterogeneous catalysts for sustainably generating glycolic acid from renewable biomass resources in the future.

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Regulating the competitive reaction pathway in glycerol conversion to lactic acid/glycolic acid selectively

Cited by 33 publications

References 53 publications

Stable and Active Au Catalyst Supported on CeMnO₃ Perovskite for Selective Oxidation of Glycerol

Stable and Active Au Catalyst Supported on CeMnO₃ Perovskite for Selective Oxidation of Glycerol

Glycerol Valorization Towards Glycolic Acid Production Over Cu‐Based Biochar Catalyst

Bismuth-Decorated Beta Zeolites Catalysts for Highly Selective Catalytic Oxidation of Cellulose to Biomass-Derived Glycolic Acid

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Regulating the competitive reaction pathway in glycerol conversion to lactic acid/glycolic acid selectively

Cited by 33 publications

References 53 publications

Stable and Active Au Catalyst Supported on CeMnO3 Perovskite for Selective Oxidation of Glycerol

Stable and Active Au Catalyst Supported on CeMnO3 Perovskite for Selective Oxidation of Glycerol

Glycerol Valorization Towards Glycolic Acid Production Over Cu‐Based Biochar Catalyst

Bismuth-Decorated Beta Zeolites Catalysts for Highly Selective Catalytic Oxidation of Cellulose to Biomass-Derived Glycolic Acid

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Stable and Active Au Catalyst Supported on CeMnO₃ Perovskite for Selective Oxidation of Glycerol

Stable and Active Au Catalyst Supported on CeMnO₃ Perovskite for Selective Oxidation of Glycerol