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  • 101.
    Xu, Chao
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK). Anhui University of Technology, People's Republic of China .
    Hedin, Niklas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Shi, Hua-Tian
    Zhang, Qian-Feng
    A semiconducting microporous framework of Cd6Ag4(SPh)(16) clusters interlinked using rigid and conjugated bipyridines2014Inngår i: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 50, nr 28, s. 3710-3712Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ternary supertetrahedral chalcogenolate clusters were interlinked with bipyridines into a microporous semiconducting framework with properties qualitatively different from those of the original clusters. Both the framework and the clusters were effective photocatalysts, and rapidly degraded the dye rhodamine B.

  • 102. Xu, Zichen
    et al.
    Zhao, Guoying
    Hedin, Niklas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK). Chinese Academy of Sciences, China.
    Xu, Mengmeng
    Liu, Jiahui
    Ullah, Latif
    Zhang, Suojiang
    Fast Catalytic Esterification Using a Hydrophobized Zr-MOF with Acidic Ionic Liquid Linkers2020Inngår i: Chemistryselect, ISSN 2365-6549, Vol. 5, nr 3, s. 1153-1156Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A Zr-MOF with an acidic ionic liquid linker ([bpyH][CF3SO3]) were externally hydrophobized with polydimethylsiloxane (PDMS) via a vapor deposition method (denoted as PDMS@UiO-67-CF3SO3). The morphology of UiO-67-CF3SO3 was well maintained after PDMS coating, and PDMS had little effect on the chemical properties of UiO-67-CF3SO3, while the hydrophobicity of the surface of UiO-67-CF3SO3 was improved greatly as demonstrated by water contact angle measurement. The derived hydrophobized PDMS@UiO-67-CF3SO3 exhibited excellent catalytic performance in the esterification of acetic acid and isooctyl alcohol, it only needed 4 h to reach the reaction equilibrium, while for UiO-67-CF3SO3, it was 18 h. The decrease in reaction time was mainly attributed to the accelerated the removal of water and isooctyl acetate, resulting the increase rate in the forward reaction. In addition, in the other esterification of acids and alcohols, PDMS@UiO-67-CF3SO3 also showed good catalytic performance.

  • 103.
    Yahia, Salwa Haj
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK). University of Gabes, Tunisia.
    Lee, Kian Keat
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Ayed, Brahim
    Hedin, Niklas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Church, Tamara L.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Activated Carbons from Hydrochars Prepared in Milk2019Inngår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, artikkel-id 16956Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Hydrothermal carbonization converts organics in aqueous suspension to a mixture of liquid components and carbon-rich solids (hydrochars), which in turn can be processed into activated carbons. We investigated whether milk could be used as a medium for hydrothermal carbonization, and found that hydrochars prepared from milk, with or without an added fibrous biomass, contained more carbon (particularly aliphatic carbon), less oxygen, and more mineral components than those prepared from fibrous biomass in water. Activated carbons produced from hydrochars generated in milk had lower specific surface areas and CO2 capacities than those from hydrochars formed in water; however, these differences disappeared upon normalizing to the combustible mass of the solid. Thus, in the context of N-2 and CO2 uptake on activated carbons, the primary effect of using milk rather than water to form the hydrochar precursor was to contribute inorganic mass that adsorbed little CO2. Nevertheless, some of the activated carbons generated from hydrochars formed in milk had specific CO2 uptake capacities in the normal range for activated carbons prepared by activation in CO2 (here, up to 1.6 mmol g(-1) CO2 at 15 kPa and 0 degrees C). Thus, hydrothermal carbonization could be used to convert waste milk to hydrochars and activated carbons.

  • 104. Yao, Qingxia
    et al.
    Su, Jie
    Cheung, Ocean
    Liu, Qingling
    Hedin, Niklas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Zou, Xiaodong
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Interpenetrated metal-organic frameworks and their uptake of CO2 at relatively low pressures2012Inngår i: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 22, nr 20, s. 10345-10351Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Adsorption-driven separation of CO2 from flue gas has the potential to cut the cost for carbon capture and storage. Among the porous physisorbents, metal-organic frameworks (MOFs) are a class of promising candidates for gas separation and storage owing to their extraordinarily high specific surface areas and pore volumes, and predesigned pore structures. Here, we report three interpenetrated MOFs composed of Zn4O clusters and rigid dicarboxylate anions, namely SUMOF-n (SU StockholmUniversity; n = 2, 3, 4). All the interpenetrated MOFs possess small pores of two different types and high pore volumes. SUMOF-2 had a structure similar to interpenetrated MOF-5, but with an extra-framework cation present in one of the two types of pores. SUMOF-3 was an interpenetrated version of IRMOF-8 while SUMOF-4 crystallized with mixed linkers, biphenyl-4,4'-dicarboxylic acid and benzene-1,4-dicarboxylic acid. Among the three SUMOFs, SUMOF-4 had the largest specific surface area (1612 m(2) g(-1)) and pore volume. Single component adsorption of CO2 and N-2 was determined at 273 K. We showed that the interpenetrated SUMOF-2 adsorbedmore CO2 than non-interpenetrated MOF-5 under 273 K and 1 bar. This may be explained by the increased electric field gradients due to the interpenetration in the MOF. The uptake of CO2 for SUMOF-2 and SUMOF-4 was significant at somewhat higher pressure. Their CO2 isotherms were close to linear, which could be beneficial for separation of CO2 via pressure swing adsorption from biogas or natural gas. On the other hand, SUMOF-3 adsorbed most CO2 at pressures relevant for CO2 capture from flue gas.

  • 105.
    Yuan, Ning
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK). Swedish University of Agricultural Sciences, Sweden.
    Church, Tamara L.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Brandt, Erik G.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Hedin, Niklas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Zou, Xiaodong
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Bernin, Diana
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK). Chalmers University, Sweden.
    Insights into Functionalization of Metal-Organic Frameworks Using In Situ NMR Spectroscopy2018Inngår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, artikkel-id 17530Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Postsynthetic reactions of metal-organic frameworks (MOFs) are versatile tools for producing functional materials, but the methods of evaluating these reactions are cumbersome and destructive. Here we demonstrate and validate the use of in situ NMR spectroscopy of species in the liquid state to examine solvent-assisted ligand exchange (SALE) and postsynthetic modification (PSM) reactions of metal-organic frameworks. This technique allows functionalization to be monitored over time without decomposing the product for analysis, which simplifies reaction screening. In the case of SALE, both the added ligand and the ligand leaving the framework can be observed. We demonstrate this in situ method by examining SALE and PSM reactions of the robust zirconium MOF UiO-67 as well as SALE with the aluminum MOF DUT-5. In situ NMR spectroscopy provided insights into the reactions studied, and we expect that future studies using this method will permit the examination of a variety of MOF-solute reactions.

  • 106.
    Zhao, Guoying
    et al.
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Aziz, Baroz
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Hedin, Niklas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
    Carbon dioxide adsorption on mesoporous silica surfaces containing amine-like motifs2010Inngår i: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 87, nr 9, s. 2907-2913Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The postcombustion separation of CO2 from a flue gas mixture is a unit operation in carbon capture. Today, CO2 is normally separated with alkanolamines in aqueous solutions. These absorption processes are energy intensive and costly. Increased environmental considerations and the significant footprints of many energy sources warrant the development of new gas separation techniques for the competitive implementation of carbon capture and storage technologies. Improved adsorbent-mediated separation processes are candidates for such new low-energy low-cost processes. In this study, porous silica-based adsorbents with amine-like motifs were synthesized. The temperature- and pressure-dependent adsorption of CO2 and CO2/H2O mixtures were determined and compared for these materials. The experimental uptake capacities of the materials modified with primary propyl amine moieties were significantly higher than those of materials modified with bis-ethanol amine or amidine. The propyl-amine-modified samples also showed good selectivity for CO2 over nitrogen gas.

  • 107.
    Zhao, Li
    et al.
    Max Planck Institute for Colloids and Interfaces, Golm.
    Bacsik, Zoltan
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Hedin, Niklas
    Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
    Wei, Wei
    Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan.
    Sun, Yuhan
    Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan.
    Antonietti, Markus
    Max Planck Institute for Colloids and Interfaces, Golm.
    Titirici, Maria-Magdalena
    Max Planck Institute for Colloids and Interfaces, Golm.
    Carbon Dioxide Capture on Amine-Rich Carbonaceous Materials Derived from Glucose2010Inngår i: CHEMSUSCHEM, ISSN 1864-5631, Vol. 3, s. 840-845Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The synthesis of carbonaceous materials with a high surface density of amino functions for CO2 sorption and sequestration is reported. The amino-rich carbonaceous materials are characterized by elemental analysis, N2 sorption, scanning and transmission electron microscopy, zeta potential, TGA and FTIR measurements. A detailed discussion on the use of these materials in CO2 capture is provided. The materials show significant sorption capabilities for CO2 (4.3 mmol g−1at −20 °C and 1 bar). Furthermore, they show a high apparent selectivity for CO2 over N2 at both low and high temperatures.

123 101 - 107 of 107
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