Determination of retro-aldol reaction type for glyceraldehyde under hydrothermal conditions

Mainil, Rahmat Iman; Paksung, Nattacha; Matsumura, Yukihiko

doi:10.1016/j.supflu.2018.09.013

Cited by 7 publications

(4 citation statements)

References 30 publications

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“…The black arrows are reaction pathways adapted from previous research. 5,19,20,25,27,28 As discussed in sub-section 3.1.2, the acetic acid formation from GA was observed during pulse-pyrolysis of GA. GA is known to dehydrate to ketene. 29 It is probable that, ketene rehydrate to form acetic acid, 30,31 as depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Hydrous pyrolysis of glucose using a rapid pulsed reaction technique

et al. 2023

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Section: Resultsmentioning

confidence: 99%

Hydrous pyrolysis of glucose using a rapid pulsed reaction technique

et al. 2023

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“…In supercritical water, radical decomposition of glyceraldehyde is the domninant reaction pathway, resulting in the formation of glycolaldehyde, formaldehyde, formic acid, and acetaldehyde. Long reaction times favor gasification to CO 2 in subcritical conditions and to CO and H 2 in supercritical conditions . Various other compounds also form at 500 °C due to pyrolysis .…”

Section: Homogeneous Catalysismentioning

confidence: 99%

“…Long reaction times favor gasification to CO 2 in subcritical conditions and to CO and H 2 in supercritical conditions. 24 Various other compounds also form at 500 °C due to pyrolysis. 25 Thus, to form LA, it is best to maintain subcritical conditions as it avoids radical-driven reactions leading to undesired products.…”

Section: Homogeneous Catalysismentioning

confidence: 99%

Homogeneous and Heterogeneous Catalysis of Glucose to Lactic Acid and Lactates: A Review

Saulnier-Bellemare,

Patience

2024

ACS Omega

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The current societal demand to replace polymers derived from petroleum with sustainable bioplastics such as polylactic acid (PLA) has motivated industry to commercialize ever-larger facilities for biobased monomers like lactic acid. Even though most of the lactic acid is produced by fermentation, long reaction times and high capital costs compromise the economics and thus limit the appeal of biotechnological processes. Catalytic conversion of hexose from biomass is a burgeoning alternative to fermentation. Here we identify catalysts to convert glucose to lactic acid, along with their proposed mechanisms. High Lewis acidity makes erbium salts among the most active homogeneous catalysts, while solvent coordination with the metal species polarize the substrate, increasing the catalytic activity. For heterogeneous catalysts, Sn-containing bimetallic systems combine the high Lewis acidity of Sn while moderating it with another metal, thus decreasing byproducts. Hierarchical bimetallic Sn-Beta zeolites combine a high number of open sites catalyzing glucose isomerization in the mesoporous regions and the confinement effect assisting fructose retro-aldol in microporous regions, yielding up to 67% lactic acid from glucose. Loss of activity is still an issue for heterogeneous catalysts, mostly due to solvent adsorption on the active sites, coke formation, and metal leaching, which impedes its large scale adoption.

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“…Water at a temperature above 374 °C and under a pressure of 22.1 MPa is a convenient medium for dissolving many organic compounds. Furthermore, under these conditions, water is very reactive, and gasification takes place easily. − This leads to the alleviation of a drying requirement, which is highly energy-intensive for the gasification of high-moisture-content biomass similar to POME. This excellent potential does not always come with the possibility for the recovery of prized nutrients, such as nitrogen and phosphorus, in parallel with gas production.…”

Section: Introductionmentioning

confidence: 99%

New Application of Supercritical Water Gasification to Palm Oil Mill Effluent: Gasification and Phosphorus Recovery

Mainil

Matsumura

2019

Energy Fuels

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The simultaneous production of fuel gas and inorganic phosphorus from palm oil mill effluent (POME) in supercritical water was experimentally studied herein. A laboratory-scale continuous reactor was employed, and POME was treated in supercritical water at 500–600 °C under a pressure of 25 MPa, with a residence time of 5–50 s. The effects of temperature and residence time on the carbon yields, gas composition, and behavior of phosphorus during supercritical water gasification were examined. A reaction model was developed, and reaction rate constants for first-order kinetics were determined. The calculation was based on the model agreed well with the experimental results.

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Determination of retro-aldol reaction type for glyceraldehyde under hydrothermal conditions

Cited by 7 publications

References 30 publications

Hydrous pyrolysis of glucose using a rapid pulsed reaction technique

Hydrous pyrolysis of glucose using a rapid pulsed reaction technique

Homogeneous and Heterogeneous Catalysis of Glucose to Lactic Acid and Lactates: A Review

New Application of Supercritical Water Gasification to Palm Oil Mill Effluent: Gasification and Phosphorus Recovery

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