Tuning of texture and surface chemistry of carbon xerogels

Mahata, Nagendranath; Pereira, M.F.R.; Suárez-Garcı́a, Fabián; Martı́nez-Alonso, A.; Tascón, J.M.D.; Figueiredo, José L.

doi:10.1016/j.jcis.2008.05.006

Cited by 85 publications

(72 citation statements)

References 7 publications

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“…Concerning the CDC-H, the amount of adsorbed N 2 is quite close to the original CDC, suggesting that the loss of surface area on CDC-H is negligible. On the other hand, air oxidization results in more adsorbed N 2 , which is attributed to the partial activation of carbon during the air oxidation process at high temperature [18,19]. This activation takes place by partial gasification of carbon to produce CO and CO 2 .…”

Section: Characterizations Of the Adsorbentsmentioning

confidence: 99%

Adsorption of acetaldehyde onto carbide-derived carbon modified by oxidation

Wang

Sun

Zhu

et al. 2015

Chemical Engineering Journal

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h i g h l i g h t sThe influence of oxidation modification on the properties of CDC was studied. The relationship between the properties and adsorption performance was studied. The acidic oxygen-containing groups in CDC increase the adsorption capacities. DFT predicts the role of acidic oxygen-containing groups for adsorption. a r t i c l e i n f o t r a c tThe adsorption of acetaldehyde over carbide-derived carbon (CDC) modified with nitric acid, hydrogen peroxide, or air was investigated. The physicochemical properties of the original and modified CDCs were characterized by N 2 adsorption, Fourier transform infrared spectrometer, temperature programmed desorption and X-ray photoelectron spectroscopy. It was observed that the oxidation modification, especially the nitric acid treatment, could significantly enhance the adsorption performance of CDC for acetaldehyde. The increase of acidic oxygen-containing groups like carboxylic acids and anhydrides in the modified CDCs results in the increase of adsorption performance. The density functional theory calculations and in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy show that these acidic oxygen-containing groups display strong hydrogen bonding interactions with acetaldehyde molecule, leading to the enhanced adsorption performance.Ó 2015 Published by Elsevier B.V.

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Section: Characterizations Of the Adsorbentsmentioning

confidence: 99%

Adsorption of acetaldehyde onto carbide-derived carbon modified by oxidation

Wang

Sun

Zhu

et al. 2015

Chemical Engineering Journal

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“…Using molecular oxygen, arabinoic acid could be synthesised from arabinose, D-arabino-1,4-lactone being found as an intermediary (Scheme 4). Preliminary results showed that MWCNTs (Nanocyl-NC3100) and carbon xerogel (CX, prepared by the resorcinol/formaldehyde approach [15]), loaded with 1 wt.% Au (by the sol method [13]) were used as catalysts. Au/CNT was less active than Au/CX.…”

Section: Organic Chemistrymentioning

confidence: 99%

Gold highlights on the 22nd Meeting of the Portuguese Society of Chemistry in Braga, Portugal, July 3–6, 2011

Carabineiro

2011

Gold Bull

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“…Such a carbon metal-free catalyst displays a high stability as a function of the test duration under severe reaction conditions, i.e., high space velocity, low O 2 -to-H 2 S ratio. In the literature, the incorporation of these oxygenated functional groups has generally been carried out through oxidation treatments of the pristine carbon materials with different oxidants such as liquid HNO 3 [17,18], H 2 SO 4 [19], KMnO 4 [20], and H 2 O 2 [21] or through gaseous reactants like oxygen plasma [22], ozone [23], or CO 2 [24]. The main drawbacks of the liquid-phase treatments are the generation of a large amount of acid waste and the need for a subsequent washing step to remove the residual acid adsorbed on the sample surface.…”

Section: Introductionmentioning

confidence: 99%

Gaseous Nitric Acid Activated Graphite Felts as Hierarchical Metal-Free Catalyst for Selective Oxidation of H2S

Duong‐Viet

et al. 2018

Catalysts

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Abstract:In this study, we reported on the influence of gaseous HNO 3 treatment on the formation of defects decorated with oxygenated functional groups on commercial graphite felts (GFs). The gaseous acid treatment also leads to a remarkable increase of the specific as well as effective surface area through the formation of a highly porous graphite structure from dense graphite filamentous. The as-synthesized catalyst was further used as a metal-free catalyst in the selective oxidation of H 2 S in industrial waste effluents. According to the results, the defects decorated with oxygenated groups were highly active for performing selective oxidation of H 2 S into elemental sulfur. The desulfurization activity was relatively high and extremely stable as a function of time on stream which indicated the high efficiency of these oxidized un-doped GFs as metal-free catalysts for the selective oxidation process. The high catalytic performance was attributed to both the presence of structural defects on the filamentous carbon wall, which acting as a dissociative adsorption center for the oxygen, and the oxygenated functional groups, which could play the role of active sites for the selective oxidation process.

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Tuning of texture and surface chemistry of carbon xerogels

Cited by 85 publications

References 7 publications

Adsorption of acetaldehyde onto carbide-derived carbon modified by oxidation

Adsorption of acetaldehyde onto carbide-derived carbon modified by oxidation

Gold highlights on the 22nd Meeting of the Portuguese Society of Chemistry in Braga, Portugal, July 3–6, 2011

Gaseous Nitric Acid Activated Graphite Felts as Hierarchical Metal-Free Catalyst for Selective Oxidation of H2S

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