The role of activated carbons functionalized with thiol and sulfonic acid groups in catalytic wet peroxide oxidation

Gomes, Helder; Miranda, Sandra M.; Sampaio, Maria J.; Figueiredo, José L.; Silva, Adrián M.T.; Faria, Joaquim L.

doi:10.1016/j.apcatb.2011.05.044

Cited by 78 publications

(49 citation statements)

References 29 publications

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“…These correspond mainly to phenols/quinones and carboxylic acids, which are decomposed as CO above 873 K and as CO 2 between 403 and 723 K, respectively [40,41]. The analysis of the SO 2 spectra reveals that all materials treated with sulfuric acid contain sulfur functional groups, the higher fraction desorbing between 623-663 K is associated with sulfonic acids groups [42,43], which is in agreement with XPS spectra of S2p (Fig. 1).…”

Section: Quantification Of Functional Groups On the Nanomaterials Sursupporting

confidence: 72%

Bioethanol Transformations Over Active Surface Sites Generated on Carbon Nanotubes or Carbon Nanofibers Materials

Almohalla¹,

Morales²,

Asedegbega–Nieto³

et al. 2014

TOCATJ

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Catalytic bioethanol transformations over carbon nanomaterials (nanofibers and nanotubes) have been evaluated at atmospheric pressure and in the temperature range of 473-773 K. The pristine carbon materials were compared with these samples after surface modification by introducing sulfonic groups. The specific activity for ethanol dehydrogenation, yielding acetaldehyde, increases with the surface graphitization degree for these materials. This suggests that some basic sites can be related with specific surface graphitic structures or with the conjugated basic sites produced after removing acidic oxygen surface groups. Concerning the dehydration reaction over sulfonated samples, it is observed that catalytic activities are related with the amount of incorporated sulfur species, as detected by the evolution of SO 2 in the Temperature programmed Desorption (TPD) as well as by the analysis of sulfur by X-Ray Photoelectron Spectroscopy (XPS).

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Section: Quantification Of Functional Groups On the Nanomaterials Sursupporting

confidence: 72%

Bioethanol Transformations Over Active Surface Sites Generated on Carbon Nanotubes or Carbon Nanofibers Materials

Almohalla¹,

Morales²,

Asedegbega–Nieto³

et al. 2014

TOCATJ

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“…The spectra reveal that desorption of Scontaining groups occurs from the surface in a specific temperature range (200-400 °C), probably due to the decomposition of sulphonic groups into SO 2 species [31]. In fact, the formation of these groups was already reported after a similar liquid-phase treatment performed over activated carbons [32,33]. In agreement with the H 2 SO 4 concentration used in each treatment, the CNT-S sample showed a richer surface than CNT-NS, with respect to S- and CNT-S.…”

Section: Oxidation With Nitric Acid (Cnt-n) Results In An Increase Ofmentioning

confidence: 85%

The role of O- and S-containing surface groups on carbon nanotubes for the elimination of organic pollutants by catalytic wet air oxidation

Rocha

Silva

Romero

et al. 2014

Applied Catalysis B: Environmental

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“…Oxidation with sulfuric acid or a mixture of sulfuric acid/nitric acid by hydrothermal methods is routinely used for such a purpose [12,13,53,55,57], incorporating mainly thiol (-SH) and sulfonic acid (-SO 3 H) groups. Porous carbons functionalized with -SO 3 H have been presented as environmental-friendly solid acid catalysts, and they are particularly important in reactions where typically liquid acids are used; however, they can be also beneficial for improved pollutant removal [12,13,38,[55][56][57]. In addition to the use of H 2 SO 4 as S-source, others sulfonating agents as benzenesulfonic acid (C 6 H 5 SO 3 H), p-toluenesulfonic acid (PTSA, CH 3 C 6 H 4 SO 3 H), and "piranha" solution (H 2 O 2 -H 2 SO 4 ) were proposed [29,57,58].…”

Section: Sulfonic Acid Surface Groupsmentioning

confidence: 99%

“…Considering that CNTs present a non-microporous Figure 1. Oxygen, nitrogen and sulfur surface groups incorporated on carbon nanotubes (CNTs) by post-synthesis treatments, and techniques for their identification/quantification [9][10][11][12][13][14][15][16][17].…”

Section: Tuning Carbon Nanotube Propertiesmentioning

confidence: 99%

Tuning CNT Properties for Metal-Free Environmental Catalytic Applications

Rocha

Soares

Figueiredo

et al. 2016

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Abstract:The application of carbon nanotubes (CNTs) as metal-free catalysts is a novel approach for heterogeneous liquid phase catalytic systems. Textural and chemical modifications by liquid/gas phase or mechanical treatments, as well as solid state reactions, were successfully applied to obtain carbon nanotubes with different surface functionalities. Oxygen, nitrogen, and sulfur are the most common heteroatoms introduced on the carbon surface. This short-review highlights different routes used to develop metal-free carbon nanotube catalysts with enhanced properties for Advanced Oxidation Processes.

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The role of activated carbons functionalized with thiol and sulfonic acid groups in catalytic wet peroxide oxidation

Cited by 78 publications

References 29 publications

Bioethanol Transformations Over Active Surface Sites Generated on Carbon Nanotubes or Carbon Nanofibers Materials

Bioethanol Transformations Over Active Surface Sites Generated on Carbon Nanotubes or Carbon Nanofibers Materials

The role of O- and S-containing surface groups on carbon nanotubes for the elimination of organic pollutants by catalytic wet air oxidation

Tuning CNT Properties for Metal-Free Environmental Catalytic Applications

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