Zeolite H-USY for the production of lactic acid and methyl lactate from C3-sugars

West, Ryan; Holm, Martin Spangsberg; Saravanamurugan, Shunmugavel; Xiong, Jianmin; Beversdorf, Zachary; Taarning, Esben; Christensen, Claus H.

doi:10.1016/j.jcat.2009.10.023

Cited by 205 publications

(265 citation statements)

References 32 publications

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“…Similar mechanisms have been proposed by numerous authors [5,30,33,[39][40], although none of these studies have modelled the mechanism at the DFT level of theory. The DFT predicted kinetic and thermodynamic parameters are summarised in Table 3.…”

Section: Advanced Chemical Kineticssupporting

confidence: 59%

Oxidation of Glycerol to Lactic Acid by Gold on Acidified Alumina: A Kinetic and DFT Case Study

Ntho¹,

Gqogqa²,

Aluha³

2018

Advanced Chemical Kinetics

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The aim of this chapter is to present proposed kinetic and density functional theory (DFT) models for the selective oxidation of glycerol to various hydroxy-acids over an acidified Au/γ-Al 2 O 3 catalyst. Glycerol oxidation over gold-based catalysts to valueadded chemicals continues to attract attention worldwide. Both the kinetics and theoretical mechanisms of this reaction have been reported in the past. However, some of the reported kinetic data was possibly collected under mass transfer limitations. In this case study we demonstrate that if mass transfer is eliminated, a pseudo zero-order model can be fitted to the experimental data with a high degree of correlation. Furthermore, we propose a plausible mechanism of pyruvaldehyde (PA) isomerisation to lactic acid (LAC) over supported molybdenum Lewis acid sites as investigated with density functional theory (DFT) approach. A proposed DFT model suggested that the rate-limiting step in the isomerisation of PA to LAC, catalysed by a Mo Lewis acid-site, could be the dissociation of a proton from an adsorbed water molecule -the protonation step.

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Section: Advanced Chemical Kineticssupporting

confidence: 59%

Oxidation of Glycerol to Lactic Acid by Gold on Acidified Alumina: A Kinetic and DFT Case Study

Ntho¹,

Gqogqa²,

Aluha³

2018

Advanced Chemical Kinetics

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“…A strong peak at ñ = 3630 cm À1 and a weak broad peak around ñ = 3550 cm À1 are observed; they are assigned to high-frequency (HF) acidic À OH groups located in the supercage and acidic À OH groups in the sodalite cage respectively. [42][43][44][45] It is obvious that the peak at ñ = 3630 cm À1 is strong for the HY sample but weak for NaY, indicating that the À OH groups inside the supercage are abundant in HY but are nearly zero in NaY. In the case of Au/HY, the intensity of the band at ñ = 3630 cm À1 decreased, suggesting that the ÀOH groups are consumed when Au clusters were introduced into the supercage.…”

Section: Resultsmentioning

confidence: 99%

Gold Nanoclusters Confined in a Supercage of Y Zeolite for Aerobic Oxidation of HMF under Mild Conditions

Cai

Zhang

et al. 2013

Chemistry A European J

192

104

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Au nanoclusters with an average size of approximately 1 nm size supported on HY zeolite exhibit a superior catalytic performance for the selective oxidation of 5‐hydroxymethyl‐2‐furfural (HMF) into 2,5‐furandicarboxylic acid (FDCA). It achieved >99 % yield of 2,5‐furandicarboxylic acid in water under mild conditions (60 °C, 0.3 MPa oxygen), which is much higher than that of Au supported on metal oxides/hydroxide (TiO2, CeO2, and Mg(OH)2) and channel‐type zeolites (ZSM‐5 and H‐MOR). Detailed characterizations, such as X‐ray diffraction, transmission electron microscopy, N2‐physisorption, and H2‐temperature‐programmed reduction (TPR), revealed that the Au nanoclusters are well encapsulated in the HY zeolite supercage, which is considered to restrict and avoid further growing of the Au nanoclusters into large particles. The acidic hydroxyl groups of the supercage were proven to be responsible for the formation and stabilization of the gold nanoclusters. Moreover, the interaction between the hydroxyl groups in the supercage and the Au nanoclusters leads to electronic modification of the Au nanoparticles, which is supposed to contribute to the high efficiency in the catalytic oxidation of HMF to FDCA.

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“…Alternative chemocatalytic approaches toward lactic acid and alkyl lactates from carbohydrates are therefore of great interest. [17][18][19][20][21][22][23][24] One of the key reaction steps in this regard is the rearrangement of the pyruvic aldehyde intermediate to lactate via a hydride shift mechanism. [23,25] Zeolites and mesoporous silica materials containing Lewis acidic functional groups have attracted attention as promising catalysts for carbohydrate isomerization reactions.…”

mentioning

confidence: 99%

Highly Active and Recyclable Sn‐MWW Zeolite Catalyst for Sugar Conversion to Methyl Lactate and Lactic Acid

et al. 2013

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Not just sugar! Lewis‐acidic Sn‐MWW zeolites are obtained through postsynthesis functionalization of deboronated B‐MWW with Sn. These materials are highly active, selective, and recyclable catalysts for the conversion of triose sugars to methyl lactate (in methanol) and lactic acid (in water). They also demonstrate good performance in the conversion of hexose sugars and sucrose to methyl lactate.

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Zeolite H-USY for the production of lactic acid and methyl lactate from C3-sugars

Cited by 205 publications

References 32 publications

Oxidation of Glycerol to Lactic Acid by Gold on Acidified Alumina: A Kinetic and DFT Case Study

Oxidation of Glycerol to Lactic Acid by Gold on Acidified Alumina: A Kinetic and DFT Case Study

Gold Nanoclusters Confined in a Supercage of Y Zeolite for Aerobic Oxidation of HMF under Mild Conditions

Highly Active and Recyclable Sn‐MWW Zeolite Catalyst for Sugar Conversion to Methyl Lactate and Lactic Acid

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