Modification of activated carbon hydrophobicity by pyrolysis of propene

Gonçalves, Maraísa; Molina‐Sabio, M.; Rodriguez-Reinoso, F.

doi:10.1016/j.jaap.2010.04.009

Cited by 26 publications

(18 citation statements)

References 20 publications

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“…This behaviour is ascribed to the decomposition of oxygenated functional groups that are typically present on the surface of the porous activated carbons. [59] In summary, the physicochemical characterisation of the electrocatalysts demonstrated the successful deposition of Fe-complexes onto the carbon supports, and suggested that neither the adsorption of the complex nor pyrolysis have a major impact on the physicochemical properties of the carbonaceous support.…”

Section: Synthesis and Characterisation Of The Supported Fe-complexesmentioning

confidence: 93%

Carbon-supported iron complexes as electrocatalysts for the cogeneration of hydroxylamine and electricity in a NO-H2 fuel cell: A combined electrochemical and density functional theory study

Sheng

Álvarez-Gallego

Domínguez-Benetton

et al. 2018

Journal of Power Sources

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Section: Synthesis and Characterisation Of The Supported Fe-complexesmentioning

confidence: 93%

Carbon-supported iron complexes as electrocatalysts for the cogeneration of hydroxylamine and electricity in a NO-H2 fuel cell: A combined electrochemical and density functional theory study

Sheng

Álvarez-Gallego

Domínguez-Benetton

et al. 2018

Journal of Power Sources

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“…A granular activated carbon (F) with particle size around 1 mm was prepared by physical activation of carbonized olive stones according to a procedure already described [8]. Briefly, the precursor is carbonized for 2 hours under a flow of nitrogen at 850ºC and the resulting char was later reacted with a flow of carbon dioxide at 825ºC for 48 hours to reach a 52wt% burn-off.…”

Section: Preparationmentioning

confidence: 99%

Oxidation of activated carbon with aqueous solution of sodium dichloroisocyanurate: Effect on ammonia adsorption

Molina‐Sabio

Gonçalves

Rodríguez‐Reinoso

2011

Microporous and Mesoporous Materials

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An activated carbon has been oxidized with 1-10 wt% aqueous solutions of sodium dichlororisocyanurate (DCI) to introduce oxygen and chlorine surface groups by chemisorption; the formation of chlorine surface groups is important when the concentration of DCI is high, the modification of the microporosity being small. The range of stability of the groups is wide, from groups decomposing at high temperature to HCl to those groups decomposing simultaneously to HCl and CO at low temperature. The carbon with the highest degree of oxidation was heat treated under propene at 200-300ºC, this facilitating the removal of chlorine groups; thus, all chlorine groups are lost at 250ºC, even those thermally stable up to 800-900ºC. The effect of both treatments on both the hydrophilicity and the capacity to retain ammonia has also been studied. Oxidation increases the hydrophilicity of the carbon, as shown by the evolution of water adsorption and the enthalpy of immersion into water. On the other hand, oxidation increases the removal capacity of ammonia both at equilibrium and dynamic tests. However, the contribution of the chlorine surface groups on the adsorption of water and ammonia is small, the groups decomposing to CO 2 upon temperature programmed decomposition playing a more important role in the retention of both species.

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“…Evidence supporting the occurrence of this pore-mouth deposition mechanism has been developed by Gonçalves et al [281], who measured the adsorption ability of activated carbon after exposure to propene at various temperatures. Measuring the ability of the treated activated carbon to adsorb both nitrogen and carbon dioxide showed that the adsorption of the smaller molecule decreased far less than the larger one, as the temperature at which the propene exposure occurred increased (and the rate of reaction dominates over diffusion speed), i.e., a narrowing of the pores occurred at the mouth through which the smaller molecule could still pass and "access"/adsorb onto the inner porous structure.…”

Section: Distribution Of Pore Volumementioning

confidence: 71%

Microwave-assisted pyrolysis of HDPE using an activated carbon bed

et al. 2012

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Plastics play an enormous role in modern manufacturing, but the extraction and refining of raw materials, followed by the synthesis of plastics themselves, represents an enormous energy investment into a product that is all too often simply "thrown away" into a landfill after a single use. Microwave-assisted pyrolysis is a recycling technique that allows the recovery of chemical value from plastic waste by breaking down polymers into useful smaller hydrocarbons using microwave heat in the absence of oxygen. This dissertation examines the use of a catalytic activated carbon bed in this procedure, using high density polyethylene (HDPE) as a model plastic. Initial tests with the batch input of HDPE produced a condensed pyrolysis oil comprising 35.5-45.3% aromatics, with the remainder primarily short-chain aliphatics. This oil was approximately three times lighter than that produced in the absence of catalyst, with a narrower range of molecular masses that matched those of the liquid transport fuels petrol and diesel (C 5-C 21). The non-condensable gases that resulted were short-chain aliphatics that could be used as feedstock for the creation of new chemicals (such as virgin HDPE), or fuels such as natural gas and LPG. The development of apparatus capable of adding sample in a continuous fashion enabled the processing of larger quantities of HDPE, and resulted in condensed products with a significantly higher aromatic content (>80% at 450°C), and which I owe a debt of thanks to many people for the support and kindness they have shown me throughout my time in Cambridge. I would like to thank my supervisor, Professor Howard Chase, for his generous provision of tutelage, expertise, and support throughout the production of this work. A further thank you to my colleagues and the department support staff for their extremely skilled time and advice. I would also like to acknowledge the generous financial support that I have received from the Cambridge Commonwealth Trust, The Higher Education Funding Council for

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Modification of activated carbon hydrophobicity by pyrolysis of propene

Cited by 26 publications

References 20 publications

Carbon-supported iron complexes as electrocatalysts for the cogeneration of hydroxylamine and electricity in a NO-H2 fuel cell: A combined electrochemical and density functional theory study

Carbon-supported iron complexes as electrocatalysts for the cogeneration of hydroxylamine and electricity in a NO-H2 fuel cell: A combined electrochemical and density functional theory study

Oxidation of activated carbon with aqueous solution of sodium dichloroisocyanurate: Effect on ammonia adsorption

Microwave-assisted pyrolysis of HDPE using an activated carbon bed

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