Catalytic properties of carbon materials for wet oxidation of aniline

Gomes, Helder; Machado, Bruno F.; Ribeiro, Andréia; Moreira, Ivo; Rosario, M M Domingues; Silva, Adrián M.T.; Figueiredo, José L.; Faria, Joaquim L.

doi:10.1016/j.jhazmat.2008.02.070

Cited by 131 publications

(57 citation statements)

References 32 publications

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“…Those properties have been thoroughly studied by our group in order to produce suitable catalytic materials for a wide range of specific applications, in particular activated carbons, carbon xerogels and carbon nanotubes for catalytic wet air oxidation [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Activated carbons treated with sulphuric acid: Catalysts for catalytic wet peroxide oxidation

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Activated carbons treated with sulphuric acid: Catalysts for catalytic wet peroxide oxidation

et al. 2010

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“…Both specific and nonspecific interactions are important (Arenillas et al 2005;Guo et al 2006;Maroto-Valer et al 2005). As a truth of nonspecific adsorption, molecules of sizes less than 1 nm, especially from a gas phase, can be effectively adsorbed on microporous activated carbon (AC) (Arenillas et al 2005;Drage et al 2007;El-Sayed and Bandosz 2001;Gomes et al 2008;Guo and Lua 2002;Kodama et al 2002;Maroto-Valer et al 2005;Plaza et al 2007;Tamai et al 2006). On the other hand, nitrogen functional groups in the structure of AC affect CO 2 adsorption positively (Arenillas et al 2005;Drage et al 2007;Maroto-Valer et al 2005;Pevida et al 2008;Shafeeyan et al 2010).…”

mentioning

confidence: 99%

Carbon Dioxide Capture with Amine-Grafted Activated Carbon

Houshmand

Daud

Lee

et al. 2011

Water Air Soil Pollut

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There are several possible methods by which amine groups can be grafted on the surface of activated carbon (AC) to improve their capacity for CO 2 adsorption. Ethylenediamine and diethylenetriamine were selected as amino compounds for anchoring on the surface of an oxidized AC. Oxidation of AC was carried out by concentrated nitric acid. For each amino compound, two "in-solvent" and "solventfree" methods with a number of grafting times were studied. Nitrogen adsorption-desorption at 77 K and proximate and ultimate analysis were used to determine physical and chemical characteristics of the samples. Temperature-programmed (TP) CO 2 adsorption test from 30°C to 120°C were performed to investigate the effect of modification on CO 2 capture. The modification clearly had a negative effect on the textural characteristics of the samples, so the samples showed a less CO 2 uptake at lower temperatures. However, the decrease of capture capacity with increasing temperature is to somewhat softer for amine-grafted samples, so that they have a capacity comparable to the parent sample or even more than that at elevated temperatures. This property may give the new adsorbents this opportunity to be used at flue gas temperature with a higher efficiency. CO 2 capture capacity per unit surface area of all the amine-modified samples, however, was significantly improved, compared to the parent sample presenting a great influence of amino groups on the CO 2 capture capacity. Moreover, the used amine compounds and grafting methods were compared in terms of adsorbent characteristics and CO 2 uptake curves. Cyclic adsorption-desorption tests showed a satisfactory regeneration for the modified samples.

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“…TPD of aniline (Fig. 4) further shows that aniline desorbs from CuO/AC at temperatures higher than 220 o C. Clearly, these data indicate that desorption of aniline is inhibited by O 2 , and the adsorbed aniline can be mainly oxidized into CO 2 , N 2 and H 2 O at a temperatures window of 231-349 o C. Compared to wet air oxidation of aniline (at 5 MPa, 200 o C) [14], the catalytic oxidation over CuO/AC can be effectively operated at an ambient pressure.…”

Section: Methodsmentioning

confidence: 85%

Catalytic dry oxidation of aniline, benzene, and pyridine adsorbed on a CuO doped activated carbon

Liu

Lei

et al. 2009

Korean J. Chem. Eng.

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Adsorption of aniline, benzene and pyridine from water on a copper oxide doped activated carbon (CuO/ AC) at 30 o C and oxidation behavior of the adsorbed pollutants over CuO/AC in a temperature range up to 500 o C are investigated in TG and tubular-reactor/MS systems. Results show that the AC has little activity towards oxidation of the pollutants and CuO is the active oxidation site. Oxidation of aniline occurs at 231-349 o C and yields mainly CO 2 , H 2 O and N 2 . Oxidation of pyridine occurs at a narrower temperature range, 255-309 o C, after a significant amount of desorption starting at 150 o C. Benzene desorbs at temperatures as low as 105 o C and shows no sign of oxidation. The result suggests that adsorption-catalytic dry oxidation is suitable only for the strongly adsorbed pollutants. Oxidation temperatures of CuO/AC for organic pollutants are higher than 200 o C and pollutants desorbing easily at temperatures below 200 o C cannot be treated by the method.

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Catalytic properties of carbon materials for wet oxidation of aniline

Cited by 131 publications

References 32 publications

Activated carbons treated with sulphuric acid: Catalysts for catalytic wet peroxide oxidation

Activated carbons treated with sulphuric acid: Catalysts for catalytic wet peroxide oxidation

Carbon Dioxide Capture with Amine-Grafted Activated Carbon

Catalytic dry oxidation of aniline, benzene, and pyridine adsorbed on a CuO doped activated carbon

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