Heteropoly acid catalyzed hydrolysis of glycogen to glucose

Klein, Miri; Pulidindi, Indra Neel; Perkas, Nina; Gedanken, Aharon

doi:10.1016/j.biombioe.2015.02.036

Cited by 18 publications

(6 citation statements)

References 28 publications

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“…The results show the presence of some functional groups such as -COOH, -SO 3 H and -OH after sulfonation of carbon char which led to obtain solid acids catalysts. Similar absorption bands were found in carbon acids prepared from other agricultural waste[7,17].…”

supporting

confidence: 74%

“…They have been used as good and efficient adsorbent in removal of organic and inorganic pollutants from gaseous and liquid media [1][2][3][4][5][6][7]. Their chemical activation with mineral acids resulted in solid acid catalysts used as replacement of homogenous acids used in chemical reactions such as hydrolysis of cellulosic material, esterification of fatty acids and transesterification of esters [8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and IR Characterization of Activated Carbon Acid Catalysts from Cassava Peels and their Use in Esterification of Free Fatty Acid in Palm Kernel oil

Bonganga

Kindala

Nkodi

et al. 2020

IRJPAC

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The present study reports the preparation of four solid acids (CS, CPS, CAS and CPAS) from cassava peels and investigates their catalytic activities in the esterification of free fatty acid (FFA) in palm Kernel oil (PKO). The activated carbon obtained from carbonization was directly sulfonated with sulfuric acid (CS) or treated first with phosphoric acid before sulfonation (CPS). Another part of activated carbon was pyrolyzed at 800°C and treated as in the two previous cases (CAS and CPAS). The FTIR spectra of CS, CPS, CAS and CPAS showed characteristic absorption peaks of functional groups such as O=S=O (1031 cm-1), OH (3849 and 3405 cm-1), C=C (1555-1574 cm-1), S=O (1042,1031 cm-1) and P=O (754 cm-1), which confirm the presence of sulfonic, carboxylic and phosphoric groups on the surface of the activated carbon acids prepared. The total acid densities of the catalysts range from 2.26 to 3.49 mmol/g whereas the -SO3H densities were from 0.92 to 2.20 mmol/g. Amongthe four catalysts prepared, their effectiveness in the esterification of free fatty acid in palm kernel oil with a conversion rate from 70 to 90%, depended mostly on the sulfonic acid density on the catalyst, CPS showed the highest total and –SO3H acid densities with 3.49 and 2.2 mmol/g respectively and a highest free acid fatty conversion rate of 90%. Thus, CPS was more efficient than CS, CPAS and CAS. All the catalysts prepared could be reused in the esterification reaction with a mild decrease in the conversion rate.

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supporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Synthesis and IR Characterization of Activated Carbon Acid Catalysts from Cassava Peels and their Use in Esterification of Free Fatty Acid in Palm Kernel oil

Bonganga

Kindala

Nkodi

et al. 2020

IRJPAC

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“…In addition, the HPA is also an important catalyst for the formation of glucose from other saccharides. In 2015, Klein et al found that HPA can catalyze the hydrolysis of glycogen to glucose (Klein et al, 2015 ). Through a series of experiments, it can be concluded that glycogen could be completely converted to glucose by using H 3 PW 12 O 40 · n H 2 O and H 4 SiW 12 O 40 · n H 2 O as the catalyst, respectively, and the optimized hydrothermal conditions are a mass fraction of catalyst 2.4%, 100°C temperature, and 2 h reaction time.…”

Section: Hydrolytic Depolymerization Of Biomass With Hpas-based Catalmentioning

confidence: 99%

Heteropoly Acid-Based Catalysts for Hydrolytic Depolymerization of Cellulosic Biomass

Luo

et al. 2020

Front. Chem.

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Cellulose is the most abundant source of biomass, which can be converted into monosaccharide or other chemical platform molecules for the sustainable production of chemicals and fuels. Acid catalysts can promote hydrolytic degradation of cellulose into valuable platform molecules, which is of great significance in the development of chemicals and biofuels. However, there are still some shortcomings and limitations of the catalysts for the hydrolytic degradation of cellulosic biomass. Heteropoly acid (HPA), as a green catalyst, seems to be more conducive to the degradation of cellulosic biomass due to its extreme acidity. HPAs can be designed in homogeneous and heterogeneous systems. Moreover, they can be easily separated from the products in both systems by a simple extraction process. According to the unique properties of HPAs (e.g., good solubility, high thermal stability, and strong acidity), using heteropoly acid-based catalysts to depolymerize and convert cellulose into value-added chemicals and biofuels has become one of the most remarkable processes in chemistry for sustainability. In this review, the characteristics, advantages, and applications of HPAs in different categories for cellulose degradation, especially hydrolysis hydrolytic degradation, are summarized. Moreover, the mechanisms of HPAs catalysts in the effective degradation of cellulosic biomass are discussed. This review provides more avenues for the development of renewed and robust HPAs for cellulose degradation in the future.

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“…Glycogen, a biopolymer of cellulose, was used by Klein and collaborators as starting material for glucose production 29 . In their work, PW and SiW were employed as catalysts and, after 2 h at 373 K, complete conversion into glucose was achieved.…”

Section: Hydrolysis Of Cellulose and Hemicellulose: Glucose And Xylosmentioning

confidence: 99%

Heteropolycompounds as catalysts for biomass product transformations

et al. 2016

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Heteropoly acid catalyzed hydrolysis of glycogen to glucose

Cited by 18 publications

References 28 publications

Synthesis and IR Characterization of Activated Carbon Acid Catalysts from Cassava Peels and their Use in Esterification of Free Fatty Acid in Palm Kernel oil

Synthesis and IR Characterization of Activated Carbon Acid Catalysts from Cassava Peels and their Use in Esterification of Free Fatty Acid in Palm Kernel oil

Heteropoly Acid-Based Catalysts for Hydrolytic Depolymerization of Cellulosic Biomass

Heteropolycompounds as catalysts for biomass product transformations

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