Effect of acid catalysts on carbonization temperatures for ordered mesoporous carbon materials

Shon, Jeong Kuk; Jin, Xing; Choi, Yun Seok; Won, Jong Gu; Hwang, Yoon Kyung; You, Dae Jong; Li, Chengbin; Kim, Ji Man

doi:10.5714/cl.2016.20.066

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…In this case, the glycerol can be easily evaporated during torrefaction. To suppress evaporation of the glycerol, we used an aqueous sulfuric acid solution as a torrefaction catalyst because sulfuric acid in general has a relatively higher boiling point than other acid catalysts; therefore, it can help maintain continuous torrefaction at low carbonization temperatures. − We investigated characterization of resultant hybrid coal in terms of heating values, pore properties, combustion behavior, and hydrophobicity variation.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of the Glycerol-Embedded Hybrid Coal

Park

Lee

et al. 2019

ACS Sustainable Chem. Eng.

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The molasses embedded hybrid coal (Hybrid Coal by Korea Institute of Energy Research; HCK) was previously proposed as an attractive alternative to low-rank coals that tend to show low calorific values and high CO2 emissions. HCK was synthesized by mixing molasses with a low-rank coal to enhance its heating value. Nevertheless, food ethics regarding molasses additives still have impeded its commercial acceptance. In this study, we propose a glycerol (nonfood)-based coal upgrading process to improve the combustion kinetics and heating value of hybrid coal in comparison to the previous HCK. The process involves drying at 105 °C followed by torrefaction process at 250 °C. During torrefaction, the glycerol additive starts to evaporate at about 180 °C and then is almost vaporized out to the coal surface. To avoid glycerol loss, we employ sulfuric acid as a torrefaction catalyst to suppress glycerol evaporation. In comparison to the molasses yield of 65% after torrefaction in the previous HCK synthesis process, glycerol-embedded torrefaction with sulfuric acid showed a 55% yield in mass. The glycerol-embedded hybrid coal shows a homogeneous combustion peak regardless of the mixing ratios, leading to a 35% reduction of unburned carbon emissions, which is one of the particular matter sources of combustion flue gas. Furthermore, the proposed synthesis process increases the net caloric value to 80% and lowers the water uptake to 84%, even without a higher SO2 emission, in comparison with raw coal.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of the Glycerol-Embedded Hybrid Coal

Park

Lee

et al. 2019

ACS Sustainable Chem. Eng.

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“…Lately, given their widespread applications in numerous fields such as catalysis, fuel cell, gas storage, and separation, porous carbon materials have received growing attention . Porous carbons based on polymer are an attractive generation of porous materials created from light elements (H, B, C, N, and O) that are known to form strong covalent bonds .…”

Section: Introductionmentioning

confidence: 99%

Pd@tetrahedral hollow magnetic nanoparticles coated with N‐doped porous carbon as an efficient catalyst for hydrogenation of nitroarenes

Sadjadi

Heravi

2019

Applied Organom Chemis

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Hollow magnetic nanoparticles (MNPs) with tetrahedral morphology were synthesized and then covered by a shell prepared by coating with melamineformaldehyde followed by the introduction of glucose-derived carbon. Subsequently, Pd nanoparticles were immobilized and the core-shell nanocomposite was carbonized. The obtained magnetic catalyst was successfully applied for the hydrogenation of nitroarenes in aqueous media. To investigate the effects of the morphology of MNPs, the nature of carbon shell, and the order of incorporation of Pd nanoparticles, several control catalysts, including the MNPs with different morphologies (disc-like and cylinder); MNPs coated with different shells (sole glucose-derived carbon or melamine-formaldehyde carbon shell); and a nanocomposite, in which Pd was immobilized after carbonization, were prepared and examined as catalyst for the model reaction. To justify the observed different catalytic activities of the catalysts, their Pd loadings, leaching, and specific surface areas were compared. The results confirmed that tetrahedral MNPs coated with porous N-rich carbon shell exhibited the best catalytic activity. The high catalytic activity of this catalyst was attributed to its high surface area and the interaction of N-rich shell with Pd nanoparticles that led to the higher Pd loading and suppressed Pd leaching.

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“…It is preferred that adsorbents have a well‐defined mesoporous structure (2–50 nm) for the efficient removal of organic pollutants. Ordered mesoporous carbons (OMCs), a new member of the carbonaceous family, have been able to attract substantial attention because of its distinct attributes, such as high BET surface area, narrow pore size distribution, well defined ordered structure, large pore volume, and thermal stability , which promoted research development for the modification of OMCs with tunable pore sizes and improved surface chemistry , making them more suitable candidate for applications such as adsorption , catalyst support , CO 2 capture , and hydrogen storage . Traditionally nanocasting technique is employed for the synthesis of OMCs .…”

Section: Introductionmentioning

confidence: 99%

Adsorptive removal of resorcinol onto surface modified ordered mesoporous carbon: Kinetics and equilibrium study

Ahmad

Lian

Zappi

et al. 2018

Env Prog and Sustain Energy

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Ordered mesoporous carbon (OMC), a new member of carbonaceous family, has been able to attract substantial attention due to its unique attributes which are high Brunauer–Emmett–Teller (BET) surface area, narrow pore size distribution, large pore volume and thermal stability. A novel ordered mesoporous carbon was synthesized using COK‐19 silica template for the first time and doped with cerium (III) chloride for the removal of resorcinol from aqueous solution. Traditional multistage technique was employed for the synthesis of OMC. Nitrogen Adsorption–desorption isotherms, scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier transformed infrared spectroscopy (FTIR), energy dispersive x‐ray spectroscopy (EDS) were employed to characterize the modified OMCs. Adsorption behavior of resorcinol was studied using batch adsorption method. Results from adsorption kinetics and isotherms suggest that pseudo‐second‐order model and Langmuir isotherm well described the experimental data. The adsorption capacities of ordered mesoporous adsorbents decrease in the following order: OMC‐5Ce (61 mg g−1) > OMC‐3Ce (54 mg g−1) > OMC‐1Ce (46 mg g−1) > OMC‐0.5Ce (39.4 mg g−1) > OMC (34.5 mg g−1). Adsorption capacity increased by 76.8% with increasing the cerium content from 0% to 5%. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S386–S397, 2019

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Effect of acid catalysts on carbonization temperatures for ordered mesoporous carbon materials

Cited by 10 publications

References 28 publications

Preparation and Characterization of the Glycerol-Embedded Hybrid Coal

Preparation and Characterization of the Glycerol-Embedded Hybrid Coal

Pd@tetrahedral hollow magnetic nanoparticles coated with N‐doped porous carbon as an efficient catalyst for hydrogenation of nitroarenes

Adsorptive removal of resorcinol onto surface modified ordered mesoporous carbon: Kinetics and equilibrium study

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