Sulfonated coal-based solid acid catalyst synthesis and esterification intensification under ultrasound irradiation

Yu, Hewei; Niu, Shengli; Lu, Chunmei; Jing, Li; Yang, Yanzhao

doi:10.1016/j.fuel.2017.06.122

Cited by 47 publications

(25 citation statements)

References 43 publications

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“…The band at cm -1 is assigned to stretching vibration in -SO 3 H and the one between 1034-1028 cm -1 to S=O stretching vibration. Both were more clearly observed in acid-char S9/9, and would contribute to the acidic nature of the acid-chars [38].…”

Section: Characteristics Of the Acid-charsmentioning

confidence: 87%

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Chemically activated high grade nanoporous carbons from low density renewable biomass (Agave sisalana) for the removal of pharmaceuticals

Mestre

Hesse

Freire

et al. 2019

Journal of Colloid and Interface Science

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Enlarging the range of viable nanoporous carbon precursors, namely by the acid treatment of low density biomass residues, can overcome issues related with the availability and quality of raw materials that have potential impact on cost and quality grade of the final product. Experiments Nanoporous carbons were prepared following a two-step process: H 2 SO 4 digestion/polycondensation of biomass waste (Agave sisalana, sisal) to obtain acidchars that were further activated with KOH or K 2 CO 3. Selected synthesized nanoporous carbons were tested for the removal of pharmaceutical compounds-ibuprofen and iopamidol-in aqueous solutions. Findings The structure and density of the acid-chars are highly dependent on the concentration of H 2 SO 4 used in the digestion and polycondensation steps. An adequate choice of the acid-char synthesis conditions, activating agent and contact method allowed to feature nanoporous carbons with specific surface areas ranging from 600 to 2300 m 2 g-1 and apparent densities reaching 600 kg m-3. The adsorption capacity of a sample obtained by KOH-activation for the removal of micropollutants from water was twice higher than the value attained by golden activated carbon (Cabot-Norit) commercialized for this specific purpose.

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Section: Characteristics Of the Acid-charsmentioning

confidence: 87%

“…The acid-chars present a broad band at 3500-3200 cm -1 , assigned to O-H stretching vibrations in surface hydroxylic groups [36,37]. The peaks ~2920 cm -1 and ~2850 cm -1 are assigned, respectively, to symmetric and asymmetric C-H stretching vibrations of aliphatic moieties of the acid-chars [36,38].…”

Section: Characteristics Of the Acid-charsmentioning

confidence: 99%

Chemically activated high grade nanoporous carbons from low density renewable biomass (Agave sisalana) for the removal of pharmaceuticals

Mestre

Hesse

Freire

et al. 2019

Journal of Colloid and Interface Science

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show abstract

“…43 At temperatures higher than 400 °C, a significant decrease on the bands intensity was observed, confirming the release of oxygenated compounds during carbonization. 44 Besides that, decrease on the intensity bands relative to sulfonic groups was also verified. 44 The TG curves in air of the sample (B8Fe) 400 showed an initial weight loss of 6% related to water, followed by 55% loss between 230-400 °C related to carbon oxidation/ organics decomposition ( Figure S7, SI section) leaving ca.…”

Section: Resultsmentioning

confidence: 74%

“…44 Besides that, decrease on the intensity bands relative to sulfonic groups was also verified. 44 The TG curves in air of the sample (B8Fe) 400 showed an initial weight loss of 6% related to water, followed by 55% loss between 230-400 °C related to carbon oxidation/ organics decomposition ( Figure S7, SI section) leaving ca. 38% of iron oxide.…”

Section: Resultsmentioning

confidence: 74%

“…After 2 reuses a decrease on the conversion to 30% was observed ( Figure 11). Previous works 44,45 suggested that deactivation processes are likely related to −SO 3 H groups leaching and due to organic molecules, that poison the material active sites. Unlike other magnetic catalysts, which could be reused for 6 times, 17,56 in this study the material did not present high stability, that could also be related to the synthesis method used.…”

Section: Resultsmentioning

confidence: 99%

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New Magnetic Fe Oxide-Carbon Based Acid Catalyst Prepared from Bio-Oil for Esterification Reactions

Ballotin¹,

Almeida²,

Ardisson³

et al. 2020

J. Braz. Chem. Soc.

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In this work, bio-oil (an organic matrix rich in oxygen functionalities) was used to efficiently dissolve and disperse Fe 3+ which upon thermal treatment produced a carbon containing dispersed and encapsulated Fe oxide magnetic nanoparticles. These materials were prepared by dissolution of 8, 16 and 24 wt.% Fe 3+ salt in bio-oil followed by treatment at 400, 450, 500 or 600 °C in N 2 atmosphere. X-ray diffraction (XRD), scanning (SEM) and transmission electron microscopies (TEM), elemental analysis, thermogravimetric-mass spectrometry (TG-MS), potentiometric titration, Raman and Mössbauer spectroscopies showed that Fe 3+ species in bio-oil is reduced to produce magnetic nanoparticles phases: magnetite Fe 3 O 4 and maghemite γ-Fe 2 O 3. At low temperatures, the iron phases were less protected, and the carbon matrix was more reactive, while in temperatures above 500 °C, the iron phases were more stable, however, the carbon matrix was less reactive. Reaction of these magnetic carbon materials with concentrated H 2 SO 4 produced surface sulfonic acidic sites (ca. 1 mmol g −1), especially for the materials obtained at 400 and 450 °C. The materials were used as catalysts on esterification reaction of oleic acid with methanol at 100 °C and conversions of 90% were reached, however, after 2 consecutive uses, the conversion decreased to 30%, being required more studies to improve the material stability.

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Sulfonated and cross‐linked polystyrene ultrafine fibers for the esterification of palmitic acid for biodiesel production

Shao

2020

J of Applied Polymer Sci

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For the need of green and sustainable development, a fibrous solid acid catalyst was developed for the transformation of low cost oils to biodiesel in an efficient and green manner. Polystyrene was electrospun into ultrafine fibers with mean diameter of~1.34 μm, and then simultaneously cross-linked and sulfonated in sulfuric acid/acetic acid mixed solvent with paraformaldehyde as the external cross-linker. The cross-linking and sulfonation degrees were controllable by changing the ratio of sulfuric acid/acetic acid. After sulfonation and cross-linking, the solvent resistance, chemical structure, and composition of these fibers were separately characterized by scanning electron microscopy, infrared spectroscopy, and elemental analysis. At last, this novel fibrous solid acid catalyst was used to catalyze the esterification reaction of palmitic acid and methanol for biodiesel production. After optimizing the reaction conditions, this fibrous solid acid catalyst can catalyze the esterification of palmitic acid and methanol with the conversion up to 92% under mild reaction conditions. Moreover, due to the fibrous structure, this fibrous solid acid catalyst could be readily separated and reused.

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Sulfonated coal-based solid acid catalyst synthesis and esterification intensification under ultrasound irradiation

Cited by 47 publications

References 43 publications

Chemically activated high grade nanoporous carbons from low density renewable biomass (Agave sisalana) for the removal of pharmaceuticals

Chemically activated high grade nanoporous carbons from low density renewable biomass (Agave sisalana) for the removal of pharmaceuticals

New Magnetic Fe Oxide-Carbon Based Acid Catalyst Prepared from Bio-Oil for Esterification Reactions

Sulfonated and cross‐linked polystyrene ultrafine fibers for the esterification of palmitic acid for biodiesel production

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