The effects of different activated carbon supports and support modifications on the properties of Pt/AC catalysts

Aksoylu, A. Erhan; Madalena, M; Freitas, Andreia; Pereira, M.F.R.; Figueiredo, José L.

doi:10.1016/s0008-6223(00)00102-0

Cited by 243 publications

(169 citation statements)

References 16 publications

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“…The Thermogravimetric Analysis/Mass Spectrometry (TGA/MS) profile of all carbonaceous supports is presented in Figure 3. From the CO and CO 2 desorption, as the temperature is increased, it is possible to obtain information about the different superficial groups present on the support [31,32]. In Figure 3B, the CO desorption peaks show an evolution from 700 to 1000 • C mainly for the RX3, G60, and RB3 supports, which could be attributed to carbonyl and quinone groups [31,32].…”

Section: Characterization Of the Supports And Catalystsmentioning

confidence: 99%

“…From the CO and CO 2 desorption, as the temperature is increased, it is possible to obtain information about the different superficial groups present on the support [31,32]. In Figure 3B, the CO desorption peaks show an evolution from 700 to 1000 • C mainly for the RX3, G60, and RB3 supports, which could be attributed to carbonyl and quinone groups [31,32]. The CNR carbonaceous support shows two peaks in CO desorption with two maximum at 676 and 971 °C, which are related with the presence of phenol, ether, carbonyl/quinone, and anhydride groups on the surface, indicating that this support have weaker groups.…”

Section: Characterization Of the Supports And Catalystsmentioning

confidence: 99%

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Catalytic Performance of Co3O4 on Different Activated Carbon Supports in the Benzyl Alcohol Oxidation

et al. 2017

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Co 3 O 4 particles were supported on a series of activated carbons (G60, CNR, RX3, and RB3). Incipient wetness method was used to prepare these catalysts. The effect of the structural and surface properties of the carbonaceous supports during oxidation of benzyl alcohol was evaluated. The synthetized catalysts were characterized via IR, TEM, TGA/MS, XRD, TPR, AAS, XPS, and N 2 adsorption/desorption isotherm techniques. Co 3 O 4 /G60 and Co 3 O 4 /RX3 catalysts have high activity and selectivity on the oxidation reaction reaching conversions above 90% after 6 h, without the presence of promoters. Catalytic performances show that differences in chemistry of support surface play an important role in activity and suggest that the presence of different ratios of species of cobalt and oxygenated groups on surface in Co 3 O 4 /G60 and Co 3 O 4 /RX3 catalysts, offered a larger effect synergic between both active phase and support increasing their catalytic activity when compared to the other tested catalysts.

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Section: Characterization Of the Supports And Catalystsmentioning

confidence: 99%

Section: Characterization Of the Supports And Catalystsmentioning

confidence: 99%

Catalytic Performance of Co3O4 on Different Activated Carbon Supports in the Benzyl Alcohol Oxidation

et al. 2017

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“…Micropores have a high adsorption capacity for xylene, which has a minimum kinetic diameter or critical diameter in the range of 0.63-0.74 nm (Roque-Malherbe et al, 1995). Accordingly, interactions between large active Pd particles (5-6 nm) located on the mesopores or macropores of the AC support (Aksoylu et al, 2001;Kang et al, 2002) and the xylene in the micropores are relatively weak and the catalytic activity consequently decreases.…”

Section: Physical Characterization Of Ac Supportsmentioning

confidence: 99%

In situ adsorption-catalysis system for the removal of o-xylene over an activated carbon supported Pd catalyst

Huang

Zhang

2009

Journal of Environmental Sciences

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An activated carbon (AC) supported Pd catalyst was used to develop a highly efficient in situ adsorption-catalysis system for the removal of low concentrations of o-xylene. In this study, three kinds of Pd/AC catalysts were prepared and tested to investigate the synergistic efficiency between adsorption and catalysis for o-xylene removal. The Pd/AC catalyst was first used as an adsorbent to concentrate dilute o-xylene at low temperature. After saturated adsorption, the adsorbed o-xylene was oxidized to CO 2 and H 2 O by raising the temperature of the catalyst bed. The results showed that more than 99% of the adsorbed o-xylene was completely oxidized to CO 2 over a 5% Pd/AC catalyst at 140°C. Brunauer-Emmett-Teller (BET) analysis, scanning electron microscopy (SEM), temperatureprogrammed desorption (TPD), and temperature-programmed oxidation (TPO) were applied to investigate the physical properties of o-xylene adsorption-desorption and the in situ adsorption-catalysis activity of the AC support and Pd/AC catalyst. A synergistic relationship between the AC support and the active Pd species for the removal of low concentrations of o-xylene was established.

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“…All spectra show a broad and strong absorption band at 3500-3000 cm -1 with a maximum at around 3230 cm -1 , which is assigned to the stretching vibration of hydroxyl compounds from carboxyls, phenols or alcohols (Dandekar, et al, 1998;Pradhan and Sandle, 1999;Boonamnuayvitaya, et al, 2005). Upon heating sample to 150°C for 1 h a decrease of isolated OH stretching vibrations in the 3700-3750 cm -1 (Aksoylu et al, 2001), which are associated with free -OH modes and due to the adsorbed molecular water, was found for regenerated NORF700. Unlike the pretreatment and regenerated NORF700, several peaks arising from the remaining adsorbed water are observed for NORF700 exposure to N 2 /CO 2 mixture, indicating that water is located at specific positions in the structure of NORF700.…”

Section: Drifts Study For Norf700mentioning

confidence: 99%

Facile Preparation of Nitrogen-Doped Activated Carbon for Carbon Dioxide Adsorption

Chen

Peng

Lin

et al. 2014

Aerosol Air Qual. Res.

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Nitrogen-doped activated carbons with high surface areas obtained from resorcinol and formaldehyde resins were evaluated as CO 2 adsorbents in a simulated flue gas stream under anhydrous and humid conditions. These carbons were prepared using two approaches, namely ammonia treatment without nitric acid pre-oxidation and amination after preoxidation. The pre-oxidation of activated carbons considerably enhanced the nitrogen incorporation during the amination process. The amination temperature affects the content and type of nitrogen incorporated onto the carbon surface, as determined by X-ray photoelectron spectroscopy, which enhances the specific adsorbent-adsorbate interaction for CO 2 in humid conditions. The presence of H 2 O in the feed gas significantly decreased CO 2 adsorption for a very low nitrogen content of virgin activated carbon. A sample prepared via the amination of pre-oxidized carbon at 700°C (NORF700) exhibited excellent tolerance to moisture and the highest CO 2 capacity of 2.10 mmol/g in a 7% CO 2 /83% N 2 /10% H 2 O wet stream at 50°C and 130 kPa. The high performance of NORF700 was ascribed to its high surface area, adequate micropore volume, and high amounts of pyrindinic-like and pyrrole-like nitrogen species. The results indicate that nitric acid preoxidation followed by ammonia treatment at 700°C is an appropriate process for preparing adsorbents for CO 2 separation in post-combustion applications.

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The effects of different activated carbon supports and support modifications on the properties of Pt/AC catalysts

Cited by 243 publications

References 16 publications

Catalytic Performance of Co3O4 on Different Activated Carbon Supports in the Benzyl Alcohol Oxidation

Catalytic Performance of Co3O4 on Different Activated Carbon Supports in the Benzyl Alcohol Oxidation

In situ adsorption-catalysis system for the removal of o-xylene over an activated carbon supported Pd catalyst

Facile Preparation of Nitrogen-Doped Activated Carbon for Carbon Dioxide Adsorption

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