Impacts of acidity and textural properties of oxidized carbon materials on their catalytic activity for hydrolysis of cellobiose

Delidovich, Irina; Palkovits, Regina

doi:10.1016/j.micromeso.2015.07.011

Cited by 33 publications

(34 citation statements)

References 37 publications

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“…Thus, the reaction time needed to completely convert cellulose decreases in the following order CNT 2_900 >CNT 0 >CNT 2 (Figure ), indicating that the conversion of cellulose correlates well with the amount of acidic sites of the catalysts. This result is in agreement with that reported by Delidovich and Palkovits when studying the hydrolysis of cellobiose, as it was suggested that the activity of CNTs mainly depends on the concentration of acidic groups . Besides glucose, a small amount of sorbitol was also formed after 1 h and its selectivity decreased from 7.4 to 4.7 % with the introduction of surface groups to the original support (Table ), owing to the higher accumulation of glucose.…”

Section: Resultssupporting

confidence: 92%

Influence of the Surface Chemistry of Multiwalled Carbon Nanotubes on the Selective Conversion of Cellulose into Sorbitol

et al. 2017

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Section: Resultssupporting

confidence: 92%

Influence of the Surface Chemistry of Multiwalled Carbon Nanotubes on the Selective Conversion of Cellulose into Sorbitol

et al. 2017

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“…Indeed, the x-ray diffractions for the keggin structure show peaks in each of the four ranges of 2θ, namely 7°-10°, 16-23°, 25°-30°and 31°-38°. The reflections observed at 26.1°, 43.1°, 53.5°and 78.7°2θ for AC-CoPW (figure 2(b)) correspond to (002), (100), (004) and (110) diffractions respectively of hexagonal graphite (Zhang et al 2002, Sun et al 2005, Delidovich and Palkovits 2016. These reflections indicated that the graphitic structure of AC was preserved after oxidation treatment.…”

Section: Resultsmentioning

confidence: 91%

Selective oxidation of cumene into 2-phenyl-2-propanol and acetophenone over activated carbon supported Co_1.5PW₁₂O₄₀ material

Abduh

AlGarni

Kahtani

et al. 2020

Mater. Res. Express

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This article reports the oxidation of cumene by H 2 O 2 in the presence of CO 2 . It describes the role played by carbon dioxide on the course of the reaction. The reaction was catalyzed by unsupported Co 1.5 PW 12 O 40 and supported on activated carbon. The prepared materials were characterized by ICP, IR, XRD and UV. Analysis of the reaction products by gas chromatography coupled with mass spectrometry and gas chromatography showed that 2-phenyl-2-propanol and acetophenone were the main products of the reaction. Activated carbon significantly increases conversion by increasing Co 1.5 PW 12 O 40 accessibility to cumene molecules. The improvement in the conversion and selectivities of 2-phenyl-2-propanol and acetophenone by the use of the oxidizing system H 2 O 2 /CO 2 compared to the use of H 2 O 2 alone or CO 2 alone is due to the role of the percarbonate entity -HCO 4 formed by reaction between H 2 O 2 and CO 2 . Oxidation by large amounts of H 2 O 2 decreases the conversion by decreasing the solubility of cumene in the resulting aqueous medium. An increase in the reaction time resulting in a decrease in the concentration of H 2 O 2 and leaving the effect of the predominant CO 2 accentuates the cracking reactions.

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“…From Figure S4, a band at ~1631 cm −1 is observed occurring in the spectrum of HNO3 activated CA, assigned to -COO − group [30]. According to the references [9,31,32], surface oxidized carbons are promising water-tolerant materials that also demonstrated high catalytic performance for hydrolysis of cellulose or cellobiose. This might be attributed to its favorable adsorption to oxygen atoms of the …”

Section: Electrochemical Oxidation Of Cellulosementioning

confidence: 98%

Electrocatalytic Oxidation of Cellulose to Gluconate on Carbon Aerogel Supported Gold Nanoparticles Anode in Alkaline Medium

Xiao

Zhao

2015

Catalysts

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Abstract:The development of high efficient and low energy consumption approaches for the transformation of cellulose is of high significance for a sustainable production of high value-added feedstocks. Herein, electrocatalytic oxidation technique was employed for the selective conversion of cellulose to gluconate in alkaline medium by using concentrated HNO 3 pretreated carbon aerogel (CA) supported Au nanoparticles as anode. Results show that a high gluconate yield of 67.8% and sum salts yield of 88.9% can be obtained after 18 h of electrolysis. The high conversion of cellulose and high selectivity to gluconate could be attributed to the good dissolution of cellulose in NaOH solution which promotes its hydrolysis, the surface oxidized CA support and Au nanoparticles catalyst which possesses high amount of active sites. Moreover, the bubbled air also plays important role in the enhancement of cellulose electrocatalytic conversion efficiency. Lastly, a probable mechanism for electrocatalytic oxidation of cellulose to gluconate in alkaline medium was also proposed.

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Impacts of acidity and textural properties of oxidized carbon materials on their catalytic activity for hydrolysis of cellobiose

Cited by 33 publications

References 37 publications

Influence of the Surface Chemistry of Multiwalled Carbon Nanotubes on the Selective Conversion of Cellulose into Sorbitol

Influence of the Surface Chemistry of Multiwalled Carbon Nanotubes on the Selective Conversion of Cellulose into Sorbitol

Selective oxidation of cumene into 2-phenyl-2-propanol and acetophenone over activated carbon supported Co_1.5PW₁₂O₄₀ material

Electrocatalytic Oxidation of Cellulose to Gluconate on Carbon Aerogel Supported Gold Nanoparticles Anode in Alkaline Medium

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Impacts of acidity and textural properties of oxidized carbon materials on their catalytic activity for hydrolysis of cellobiose

Cited by 33 publications

References 37 publications

Influence of the Surface Chemistry of Multiwalled Carbon Nanotubes on the Selective Conversion of Cellulose into Sorbitol

Influence of the Surface Chemistry of Multiwalled Carbon Nanotubes on the Selective Conversion of Cellulose into Sorbitol

Selective oxidation of cumene into 2-phenyl-2-propanol and acetophenone over activated carbon supported Co1.5PW12O40 material

Electrocatalytic Oxidation of Cellulose to Gluconate on Carbon Aerogel Supported Gold Nanoparticles Anode in Alkaline Medium

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Selective oxidation of cumene into 2-phenyl-2-propanol and acetophenone over activated carbon supported Co_1.5PW₁₂O₄₀ material