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Functional group resolved NMR relaxation of 3-carbon adsorbates in mesoporous alumina

Magnetic Resonance Letters 2023年第3期3卷 248-255,I0004页

作者： Neil Robinson Carmine D’Agostino Michael LJohns Department of Chemical engineering The University of Western Australia35 Stirling HighwayPerthWA 6009Australia Department of Chemical engineering The University of ManchesterOxford RoadManchesterM139PLUK dipartimento di ingegneria civile ChimicaAmbientale e Dei Materiali(DICAM)Alma Mater Studiorum e Universita di BolognaVia Terracini28Bologna40131Italy

NMR relaxation analysis provides a unique and non-invasive probe of fluid dynamics within porous materials,and may be applied to the interpretation of a wide variety of material and interfacial ***,we report two-dimensional^(1)H T_(1)-T_(2)relaxation correlation measurements of a range of three-carbon adsorbates(1-propanol,2-propanol and propanoic acid)imbibed within the mesoporous metal oxide *** data,acquired across field strengths of 2 MHz,12.7 MHz and 43 MHz,clearly reveal two populations in each measurement,identified as the alkyl and hydroxyl moieties of each *** results expand the range of materials in which such functional group resolved relaxation is known to occur,and demonstrate the clear persistence of such phenomena using a range of typical benchtop NMR systems employed to study fluid-saturated porous media.

关键词： NMR relaxation Adsorption Porous media Low-field NMR

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Silver impregnated carbon for adsorption and desorption of elemental mercury vapors

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Journal of environmental Sciences 2011年第9期23卷 1578-1583页

作者： Despina Karatza Marina Prisciandaro Amedeo Lancia dino Musmarra dipartimento di ingegneria chimica Universitàdi Napoli "Federico II" dipartimento di chimica Ingegneria Chimica e MaterialiUniversitàde L’Aquila Centro Interdipartimentale di Ricerca in ingegneria ambientale Dipartimento di Ingegneria CivileSeconda Universitàdegli Studi di NapoliReal Casa dell’AnnunziataVia Roma 2981031 Aversa (CE)Italy

The Hg 0 vapor adsorption experimental results on a novel sorbent obtained by impregnating a commercially available activated carbon （Darco G60 from BDH） with silver nitrate were *** study was performed by using a fundamental approach,in an apparatus at laboratory scale in which a synthetic flue gas,formed by Hg 0 vapors in a nitrogen gas stream,at a given temperature and mercury concentration,was flowed through a fixed bed of adsorbent *** curves and adsorption isotherms were obtained for bed temperatures of 90,120 and 150°C and for Hg 0 concentrations in the gas varying in the range of 0.8–5.0 mg/m 3 .The experimental gas-solid equilibrium data were used to evaluate the Langmuir parameters and the heat of *** experimental results showed that silver impregnated carbon was very effective to capture elemental mercury and the amount of mercury adsorbed by the carbon decreased as the bed temperature *** addition,to evaluate the possibility of adsorbent recovery,desorption was also *** runs showed that both the adsorbing material and the mercury could be easily recovered,since at the end of desorption the residue on solid was almost *** material balance on mercury and the constitutive equations of the adsorption phenomenon were integrated,leading to the evaluation of only one kinetic parameter which fits well both the experimentally determined breakthrough and desorption curves.

关键词： mercury carbon MSW incinerators adsorption desorption silver nitrate

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The effect of humidity on the CO_2/N_2 separation performance of copolymers based on hard polyimide segments and soft polyether chains:experimental and modeling

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Green energy & environment 2016年第3期1卷 201-210页

作者： Luca Olivieri Alberto Tena Maria Grazia De Angelis Antonio Hernández Giménez Angel e.Lozano Giulio Cesare Sarti dipartimento di ingegneria civile chimica ambientale e dei materiali Alma Mater Studiorum-Università di Bologna SMAP UA UVA-CSIC Universidad de Valladolid Facultad de Ciencias Real de Burgos s/n Helmholtz-Zentrum Geesthacht Institute of Polymer Research Instituto de Ciencia y Tecnología de Polímeros CSIC

In this work, we studied two copolymers formed by segments of a rubbery polyether（PPO or PeO） and of a glassy polyimide（BPDA-ODA or BKDA-ODA） suitable for gas separation and CO2 capture. Firstly, we assessed the absorption of water vapor in the materials, as a function of relative humidity（R.H.）, finding that the humidity uptake of the copolymers lies between that of the corresponding pure homopolymers ***, we studied the effect of humidity on CO2 and N2 permeability, as well as on CO2/N2 selectivity, up to R.H. of 75%. The permeability decreases with increasing humidity, while the ideal selectivity remains approximately constant in the entire range of water activity investigated. The humidity-induced decrease of permeability in the copolymers is much smaller than the one observed in polyimides such as Matrimid? confirming the positive effect of the polyether phase on the membrane ***, we modeled the humidity-induced decrease of gas solubility, diffusivity and, consequently, permeability, using a suitable approach that considers the free volume theory for diffusion and LF model for solubility. Such model allows estimating the extent of competition that the gases undergo with water during sorption in the membranes, as a function of the relative humidity, as well as the expected reduction of free volume by means of water molecules occupation and consequent reduction of diffusivity.

关键词： CO2 capture Humid gas permeation Transport properties in polymeric membranes Water vapor sorption Modeling

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