Fabrication of hierarchical Lewis acid Sn-BEA with tunable hydrophobicity for cellulosic sugar isomerization

Cho, Hong Je; Gould, Nicholas S.; Vattipalli, Vivek; Sabnis, S. S.; Chaikittisilp, Watcharop; Okubo, Tatsuya; Xu, Bingjun; Fan, Wei

doi:10.1016/j.micromeso.2018.12.046

Cited by 34 publications

(37 citation statements)

References 81 publications

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“…52 % ML yield, while information about other products was missing (Table 1, entry 1). Lower lactate yields were reported as expected with ethanol and n ‐butanol (Table 1, entries 3, 4, 7–11) [4,21,32] due to slower reaction rates with a longer chain alcohol.…”

Section: Catalytic Methods To Produce Lactic Acid and Alkyl Lactates supporting

confidence: 51%

“…Biomass transformation to value‐added products has been under intensive research efforts in the recent years [1–36] . The target in biorefinery has been to transfer highly abundant biomass to chemicals and fuels [37,38] .…”

Section: Introductionmentioning

confidence: 99%

“…Feasibility of heterogeneously catalysed LA and alkyl lactate industrial production is still under debate. Despite several attempts for direct transformations of sugars to LA and alkyl lactates, [1–35] relatively low yields of LA (58 %) [33] and alkyl lactates (68 %), [7,18,33] are obtained due to several side reactions, [9,11,18,30,34] originating from too high Brønsted acidity, which is required for the main reaction. Furthermore, the carbon balance in sugar transformation in water is only 80 % [34] .…”

Section: Introductionmentioning

confidence: 99%

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Heterogeneous Catalytic Synthesis of Methyl Lactate and Lactic Acid from Sugars and Their Derivatives

2020

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Recent developments in sugar transformations to methyl lactate and lactic acid are critically summarized. The highest yield of methyl lactate from glucose obtained over Sn(salen)/octylmethyl imidazolium bromide catalyst was 68 % at 160 °C whereas the highest yield of lactic acid of 58 % was achieved over hierarchical Lewis acidic Sn‐Beta catalysts at 200 °C under inert atmosphere. In addition to the desired products also humins are formed in water whereas in methanol alkyl glucosides‐ and ‐fructosides as well as acetals were generated, especially in the presence of Brønsted‐acidic sites. The main challenges limiting the industrial feasibility of these reactions are incomplete liquid phase mass balance closure, complicated product analysis and a lack of kinetic data. In addition to reporting optimized reaction conditions and catalyst properties also catalyst reuse and regeneration as well as kinetic modelling and continuous operation are summarized.

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Section: Catalytic Methods To Produce Lactic Acid and Alkyl Lactates supporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heterogeneous Catalytic Synthesis of Methyl Lactate and Lactic Acid from Sugars and Their Derivatives

2020

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“…Both materials showed an improved hydrophobicity and mass transport, which were beneficial in reactions that involve bulky molecules such as lactose. [359] Bottom-Up Methods-Soft Templating: In the following paragraph, several bottom-up approaches are discussed that make use of a mesoporogen in their hydrothermal synthesis procedure. There exist various strategies that are simply based on a change of soft template as well as on a variation of the synthesis parameters.…”

Section: Betamentioning

confidence: 99%

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

et al. 2020

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Zeolites are highly crystalline aluminosilicates with welldefined pores that are constructed of SiO 2 and AlO 4 tetrahedra. These tetrahedra can be linked together in different unique ways to form various materials with a specific topology. [1] According to the International Zeolite Association (IZA), more than 250 different topologies, which are all assigned with a three-letter code, have been identified. [2] The micropores in zeolites are typically constructed from 8, 10, or 12 tetrahedral atoms

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“…The alternative use of robust, cheap and selective synthetic catalysts for this transformation continues a challenge , . Microporous zeolite Sn‐Beta is one of the most effective chemo catalysts for saccharides isomerization, and different versions have been studied . Catalysts with eco‐friendly compositions are desired, and interesting catalytic results were reported for materials without tin, albeit catalyst stability continued to be a challenge.…”

Section: Introductionmentioning

confidence: 99%

Modified Versions of AM‐4 for the Aqueous Phase Isomerization of Aldo‐Saccharides

et al. 2020

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The isomerization of aldo‐saccharides to keto‐saccharides is an important transformation in biomass conversion processes. The use of eco‐friendly heterogeneous catalysts for these reactions is most attractive, albeit good catalytic stability continues a challenge. The as‐synthesized Aveiro‐Manchester material number 4 (AM‐4, Na3(Na,H)Ti2O2[Si2O6]2,2H2O) possessed isomerization activity, but limited stability. This versatile precursor material was modified to meet superior performances in the base‐catalyzed isomerization of the monosaccharides d‐glucose and d‐xylose, and the disaccharide d‐cellobiose, at 100 °C. Different alkali and alkaline‐earth metals were introduced into AM‐4, which influenced the catalytic properties. The Mg‐containing material was the most stable, leading to 27 % fructose yield from d‐glucose, 41 % cellobiulose from d‐cellobiose and 39 % xylulose from d‐xylose isomerization, at 2 h reaction.

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Fabrication of hierarchical Lewis acid Sn-BEA with tunable hydrophobicity for cellulosic sugar isomerization

Cited by 34 publications

References 81 publications

Heterogeneous Catalytic Synthesis of Methyl Lactate and Lactic Acid from Sugars and Their Derivatives

Heterogeneous Catalytic Synthesis of Methyl Lactate and Lactic Acid from Sugars and Their Derivatives

State of the Art and Perspectives of Hierarchical Zeolites: Practical Overview of Synthesis Methods and Use in Catalysis

Modified Versions of AM‐4 for the Aqueous Phase Isomerization of Aldo‐Saccharides

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