Organic and carbon aerogels from the NaOH‐catalyzed polycondensation of resorcinol–furfural and supercritical drying in ethanol

Wu, Dehai; Fu, Ruowen; Yu, Zhiquan

doi:10.1002/app.21582

Cited by 50 publications

(34 citation statements)

References 15 publications

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“…Figure 6 is IR spectra of three kinds of carbonized products and glucose. As shown in the figure, three substances contain the same functional groups, which is similar to glucose [17]. In this chart, the bands at 3441cm assigned to C-O-C stretching vibration absorptions [18].…”

Section: Chemical Characteristics Of Hydrothermal Carbonization Productsmentioning

confidence: 82%

Evolution of Waster Cotton Fiber Hydro-Char Physicochemical Structure during Hydrothermal Carbonation

Shi¹,

Zhang²,

Zhang³

et al. 2017

Preprint

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Abstract：In order to study the hydrothermal behavior of cotton fiber, the carbonization process and structural evolution of discarded cotton fiber (WCF) under hydrothermal conditions were discussed use microcrystalline cellulose (MCC) and glucose as model compounds. The results showed that high temperature was beneficial to the hydrolysis of discarded cotton fiber, and the yield of the sugar was 4.5% which was lower than that of MCC 6.51%.WFC and MCC are carbonized in 240~260 ℃ and 220~240 ℃ respectively, while the carbonation temperature of glucose is lower than 220 ℃. The quality ratio of C/O in WCF and glucose hydrothermal products is 5.79 and 5.85 respectively; three kinds of hydrothermal carbonization products have similar crystal structure and oxygen-containing functional groups, and the WCF carbonization products contain a lot of irregular particles while the main products of glucose carbonization are 0.5 μm carbon microspheres (CMCC). The results show that glucose is an important intermediate product of WCF hydrolysis carbonation, and there are two main paths of cotton fiber hydrothermal carbonization: some cotton fibers are completely hydrolyzed into glucose and the nucleation is formed, and then the carbon microspheres are grown; for the other part, the glucose ring of the polysaccharide oligosaccharide formed by the incomplete hydrolysis of cotton fiber in the hydrothermal environment of high temperature and pressure breaks, then forms the particulate matters.

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Section: Chemical Characteristics Of Hydrothermal Carbonization Productsmentioning

confidence: 82%

Evolution of Waster Cotton Fiber Hydro-Char Physicochemical Structure during Hydrothermal Carbonation

Shi¹,

Zhang²,

Zhang³

et al. 2017

Preprint

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“…Additionally, good cross-linking seems to be especially important in the case of film-type replication. Acid catalysts do not offer as good cross-linking strength as basic ones [67]. Note that the KOH activation does not affect the monolithic morphology of the sample.…”

Section: Resultsmentioning

confidence: 98%

Development of Microporosity in Mesoporous Carbons

et al. 2009

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Monolithic carbons with uniform and spherical mesopores can be easily obtained by filling the pores of colloidal silica monoliths with carbon precursors followed by carbonization and silica dissolution. In this study three different phenolic resin blends: resorcinol and crotonaldehyde (MC-RC), phenol and paraformaldehyde (MC-PP), and resorcinol and furfural (MC-RF) were used as carbon precursors. Subsequent heating and carbonization of the resulting silica-phenolic resin nanocomposites followed by silica dissolution afforded monolithic carbons with spherical mesopores matching the size of the silica colloids used. Development of microporosity in these carbons was achieved by post-synthesis KOH activation. This study shows that the combination of colloidal templating with post-synthesis activation affords monolithic micro-mesoporous carbons with large specific surface area and welldeveloped accessible porosity for adsorption, catalysis, environmental and energy-related applications.

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“…Similar XRD profiles have been obtained for carbon aerogel materials synthesised by other Table 1 Gas phase characteristics of the C(Mo 2 C) and CAG electrode materials BET Brunauer-Emmett-Teller, S BET BET multipoint surface area, S micro t-method micropore area, V micro t-method micropore volume, V tot total pore volume Fig. 1 a Differential pore size distribution vs. pore width plots obtained by applying NLDFT method on the nitrogen sorption (at −196°C) data and b characteristic XRD patterns for CAG and C (Mo 2 C) electrode materials research groups [20,21]. The XRD pattern for C(Mo 2 C) material has been published before [17] and is reproduced for comparison in Fig.…”

Section: Methodsmentioning

confidence: 99%

Comparison of carbon aerogel and carbide-derived carbon as electrode materials for non-aqueous supercapacitors with high performance

Laheäär

Peikolainen

Koel

et al. 2012

J Solid State Electrochem

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Two porous carbon materials, one synthesised by pyrolysis of an organic aerogel prepared using solgel method and the other synthesised from molybdenum carbide by high temperature chlorination method, were tested as supercapacitor electrode materials in a nonaqueous tetraalkylammonium salt-based electrolyte. The gravimetric capacitance values calculated for the carbon aerogel (CAG)-based system were almost two times smaller (~55 Fg −1 ) compared to carbide-derived carbon (C(Mo 2 C))-based system (~125 Fg −1 ). However, due to the very wide region of ideal polarizability, 3.6 V for C(Mo 2 C) and 3.8 V for CAG-based test cells, very high energy densities up to 63 Wh kg −1 (34 Wh dm −3 ) and power densities up to 757 kW kg −1 (314 kW dm −3 ) were estimated for these systems, respectively. CAGbased system shows very short characteristic charge/ discharge time constant values (0.05 s).

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Organic and carbon aerogels from the NaOH‐catalyzed polycondensation of resorcinol–furfural and supercritical drying in ethanol

Cited by 50 publications

References 15 publications

Evolution of Waster Cotton Fiber Hydro-Char Physicochemical Structure during Hydrothermal Carbonation

Evolution of Waster Cotton Fiber Hydro-Char Physicochemical Structure during Hydrothermal Carbonation

Development of Microporosity in Mesoporous Carbons

Comparison of carbon aerogel and carbide-derived carbon as electrode materials for non-aqueous supercapacitors with high performance

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