Preparation of Pt catalysts supported on activated carbon felts (ACF)

Miguel, Sergio R. de; Vilella, Julieta I.; Jablonski, E.L.; Scelza, Osvaldo A.; Lecea, C. Salinas-Martı́nez de; Linares-Solano, Á.

doi:10.1016/s0926-860x(02)00112-6

Cited by 89 publications

(35 citation statements)

References 23 publications

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“…875 K. No peaks are present at low reduction temperature, and this is because the palladium can be reduced by carbon at low temperature, even at room temperature as was observed by other authors [37]. In Figure 5, it can be seen that the peak above 700 K is more intense for PdN/C and NiCl/C catalysts.…”

Section: Catalysts and Support Characterizationsupporting

confidence: 56%

High-Active Metallic-Activated Carbon Catalysts for Selective Hydrogenation

Carrara

Betti

Coloma

et al. 2018

International Journal of Chemical Engineering

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A series of low-loaded metallic-activated carbon catalysts were evaluated during the selective hydrogenation of a medium-chain alkyne under mild conditions. e catalysts and support were characterized by ICP, hydrogen chemisorption, Raman spectroscopy, temperature-programmed desorption (TPD), temperature-programmed reduction (TPR), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR micro-ATR), transmission electronic microscopy (TEM), and X-ray photoelectronic spectroscopy (XPS). When studying the effect of the metallic phase, the catalysts were active and selective to the alkene synthesis. NiCl/C was the most active and selective catalytic system. Besides, when the precursor salt was evaluated, PdN/C was more active and selective than PdCl/C. Meanwhile, alkyne is present in the reaction media, and geometrical and electronic effects favor alkene desorption and so avoid their overhydrogenation to the alkane. Under mild conditions, nickel catalysts are considerably more active and selective than the Lindlar catalyst.

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Section: Catalysts and Support Characterizationsupporting

confidence: 56%

High-Active Metallic-Activated Carbon Catalysts for Selective Hydrogenation

Carrara

Betti

Coloma

et al. 2018

International Journal of Chemical Engineering

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“…The interaction of precursor cations and anions with carbon is accompanied by metal reduction [11,[15][16][17]. Thus, the Au particles size distribution on AC deposited from HAuCl 4 has been found to be bimodal, containing a significant fraction of large particles [9,18].…”

Section: Introductionmentioning

confidence: 98%

“…ACF have been used as supports for platinum [11] and palladium [12] as well as adsorbents in wastewater treatment to separate heavy metals and recover precious metals from diluted solutions [7,13,14].…”

Section: Introductionmentioning

confidence: 99%

“…The concentration and the nature of different functional groups are known to depend on the AC pretreatment by acids and bases and can be regulated by thermal treatment in different atmospheres. The influence of AC surface functional groups on the dispersion of transition metals on the catalyst surface was discussed earlier for Pt and Pd [11,[24][25][26], as well as for the Au/AC catalysts [27], but the cation exchange with protons of surface groups has not been investigated during the preparation of highly dispersed gold on activated carbon.…”

Section: Introductionmentioning

confidence: 99%

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Highly dispersed gold on activated carbon fibers for low-temperature CO oxidation

Bulushev

Yuranov

Suvorova

et al. 2004

Journal of Catalysis

202

132

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Gold nanoparticles of 2-5 nm supported on woven fabrics of activated carbon fibers (ACF) were effective during CO oxidation at room temperature. To obtain a high metal dispersion, Au was deposited on ACF from aqueous solution of ethylenediamine complex [Au(en) 2 ]Cl 3 via ion exchange with protons of surface functional groups. The temperature-programmed decomposition method showed the presence of two main types of functional groups on the ACF surface: the first type was associated with carboxylic groups easily decomposing to CO 2 and the second one corresponded to more stable phenolic groups decomposing to CO. The concentration and the nature of surface functional groups was controlled using HNO 3 pretreatment followed by either calcination in He (300-1273 K) or by iron oxide deposition. The phenolic groups are able to attach Au 3+ ions, leading to the formation of small Au nanoparticles (< 5 nm) after reduction by H 2 . This was confirmed by high-resolution electron microscopy combined with X-ray energy-dispersive analysis. The catalyst with high Au dispersion demonstrated high activity in CO oxidation. The surface carboxylic groups decomposed during interaction with [Au(en) 2 ]Cl 3 solution and reduced Au 3+ to Au 0 , resulting in the formation of bigger (> 9 nm) Au agglomerates after reduction by H 2 . These catalysts demonstrated lower activity as compared to the ones containing mostly small Au nanoparticles. Complete removal of surface functional groups rendered an inert support that would not interact with the Au precursor. The oxidation state of gold in the Au/ACF catalysts was controlled by X-ray photoelectron spectroscopy before and after the reduction in H 2 . The high-temperature reduction in H 2 (673-773 K) was necessary to activate the catalyst, indicating that metallic gold nanoparticles are active during catalytic CO oxidation.  2004 Elsevier Inc. All rights reserved.

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“…Activated carbon fibres (ACF) in the form of woven fabrics recently have been shown as suitable catalytic supports for noble metals [1][2][3][4][5]. These materials have high specific surface area up to 3000 m 2 /g and allow high loading of metal nano-particles ensuring an increased specific activity.…”

Section: Introductionmentioning

confidence: 99%

Microwave plasma assisted preparation of Pd-nanoparticles with controlled dispersion on woven activated carbon fibres

2005

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The low-pressure cold microwave (MW) plasma is shown as an efficient method to increase acidity of the ACF within less than 1 min treatment without affecting the fibre morphology and strength. The ion-exchange capacity was 1.6 times higher compared to the non-treated ACF sample. Selective removal of the carboxylic groups from the ACF surface by the air-MW-plasma allows to keep the phenolic groups intact. Palladium was deposited on ACF from [Pd(NH 3 ) 4 ]Cl 2 solution via ion-exchange with the protons of the phenolic surface groups. Surface phenolic groups were able to chemically anchor Pd in cationic form, leading after reduction in H 2 to small Pd8 nanoparticles (<3 nm). The Pd dispersion was measured by CO pulse adsorption and confirmed by the TEM analysis. Heating of the Pd/ACF catalysts in H 2 at 573-773 K is necessary to reduce Pd(II) to Pd8. This reduction can be also achieved by the H 2 -MW-plasma treatment in less than 1 min with the corresponding saving of energy. #

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Preparation of Pt catalysts supported on activated carbon felts (ACF)

Cited by 89 publications

References 23 publications

High-Active Metallic-Activated Carbon Catalysts for Selective Hydrogenation

High-Active Metallic-Activated Carbon Catalysts for Selective Hydrogenation

Highly dispersed gold on activated carbon fibers for low-temperature CO oxidation

Microwave plasma assisted preparation of Pd-nanoparticles with controlled dispersion on woven activated carbon fibres

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