Evaluation of copper supported on polymeric spherical activated carbon in the ethylbenzene dehydrogenation

Oliveira, Sérgio Botelho de; Barbosa, Danns Pereira; Monteiro, Ana Paula de Melo; Rabelo, D.; Rangel, María do Carmo

doi:10.1016/j.cattod.2007.12.040

Cited by 15 publications

(8 citation statements)

References 17 publications

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“…Furthermore, the low pressure drop of the spherical catalyst bed enables continuous flow operation with low pressure resistance, enlarging the window of operation and reducing energy costs. Although the use of PBSAC in catalysis is still in its infancy, it has been applied as catalyst support for noble metals like platinum and ruthenium in direct methanol fuel cells 15, in ethylbenzene dehydrogenation 16, and decomposition of 2‐chloroethylethylsulfide 17 using copper as supported active material or in photocatalysis as support for titanium dioxide nanoparticles 18. Recently, PBSAC has been also used in supported ionic liquid phase (SILP) catalysts using homogeneous rhodium catalysts for the hydroaminomethylation of ethylene, showing a considerably better performance compared to oxidic supports, such as silica or alumina 19.…”

Section: Introductionmentioning

confidence: 99%

Exchange of Methyl‐ and Azobenzene‐Terminated Alkanethiols on Polycrystalline Gold Studied by Tip‐Enhanced Raman Mapping

et al. 2014

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Mixed thiol self-assembled monolayers (SAMs) presenting methyl and azobenzene head groups were prepared by chemical substitution from the original single-component n-decanethiol or [4-(phenylazo)phenoxy]hexane-1-thiol SAMs on polycrystalline gold substrates. Static contact-angle measurements were carried out to confirm a change in the hydrophobicity of the functionalized surfaces following the exchange reaction. The mixed SAMs presented contact-angle values between those of the more hydrophobic n-decanethiol and the more hydrophilic [4-(phenylazo)phenoxy]hexane-1-thiol single-component SAMs. By means of tip-enhanced Raman spectroscopy (TERS) mapping experiments, it was possible to highlight that molecular replacement takes place easily and first at grain boundaries: for two different mixed SAM compositions, TERS point-by-point maps with <50 nm step sizes showed different spectral signatures in correspondence to the grain boundaries. An example of the substitution extending beyond grain boundaries and affecting flat areas of the gold surface is also shown.

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Section: Introductionmentioning

confidence: 99%

Exchange of Methyl‐ and Azobenzene‐Terminated Alkanethiols on Polycrystalline Gold Studied by Tip‐Enhanced Raman Mapping

et al. 2014

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“…19,20 During impregnation, carbon was kept in contact with 15 mL of a copper nitrate solution (15 g L −1 ) for each gram of carbon. 21 The details of preparation and characterization of the catalyst are described elsewhere. 13,21 Phenol oxidation with hydrogen peroxide was carried out in a glass reactor kept under nitrogen atmosphere in a thermostated bath, with the rotation speed being kept at 600 rpm.…”

Section: Methodsmentioning

confidence: 99%

Optimization of Phenol Removal from Industrial Petrochemical Wastewaters by Doehlert Matrix and Factorial Designs

Britto

Rebouças

Oliveira

et al. 2021

Ind. Eng. Chem. Res.

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A comparative study between two cheap oxidants (hydrogen peroxide and oxygen) was carried out in this work, aiming to solve a potential industrial problem concerning phenol removal from a petrochemical plant. Doehlert matrix or factorial designs were used for optimizing the process variables for each oxidant during catalytic wet oxidation. A set of variables was identified for each oxidant, and the most suitable one was selected based on technical and economical features. The optimized treatment successfully decreased phenol concentration in wastewater, allowing the effluent to be discharged safely according to the local environmental legislation, which poses limits to phenol. The catalyst was obtained by impregnating copper on carbon, previously prepared by carbonization of a sulfonated styrene–divinylbenzene copolymer. It was found that pH, temperature, oxidant to phenol molar ratio (O/P), the type of oxidant, and pressure can affect the catalyst activity and selectivity. For the model stream, O/P was the most significant variable, with more than 90 mol % of phenol being removed at 38 °C and at O/P values higher than 8. In the same condition, 99 mol % of phenol was removed from industrial effluent. Oxalic and acetic acids were the main products obtained for both cases, and carbon dioxide was detected, indicating the partial mineralization of phenol. Under atmospheric pressure, phenol oxidation was too low for industrial applications, but under 10 kgf cm–2 and 38 °C, the total phenol was removed, which was the optimized condition. However, for economic and environmental reasons, 130 °C and 10 kgf cm–2 were selected as the best industrial conditions to avoid additional costs related to wastewater cooling. It was concluded that both oxidation systems can be used in industrial processes, with hydrogen peroxide showing the advantage of removing phenol over a wide concentration range, while air is the most economical system. This procedure can be successfully used in industrial plants to avoid environmental contamination.

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“…Since that time, both the catalyst and the process have undergone several improvements, such as the introduction of beds with radial flow and the use of poison inhibitors (Shreve and Brink, 1997). Several works have been carried out (Santos et al, 2006;Rangel et al, 2003;Ramos et al, 2008;Miyakoshi et al, 2001;Liao et al, 2008) aiming to improve the iron-based catalysts or to find new alternatives systems and process conditions (Holtz et al, 2008;Oliveira et al, 2008;Morán et al, 2007;Ohishi et al, 2005).…”

Section: Ethylbenzene Dehydrogenation In the Presence Of Carbon Dioxidementioning

confidence: 99%

Ethylbenzene Dehydrogenation in the Presence of Carbon Dioxide over Metal Oxides

Rangel¹,

Monteiro²,

Oportus³

et al. 2012

Greenhouse Gases - Capturing, Utilization and Reduction

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Evaluation of copper supported on polymeric spherical activated carbon in the ethylbenzene dehydrogenation

Cited by 15 publications

References 17 publications

Exchange of Methyl‐ and Azobenzene‐Terminated Alkanethiols on Polycrystalline Gold Studied by Tip‐Enhanced Raman Mapping

Exchange of Methyl‐ and Azobenzene‐Terminated Alkanethiols on Polycrystalline Gold Studied by Tip‐Enhanced Raman Mapping

Optimization of Phenol Removal from Industrial Petrochemical Wastewaters by Doehlert Matrix and Factorial Designs

Ethylbenzene Dehydrogenation in the Presence of Carbon Dioxide over Metal Oxides

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