| 1. |
- Engström, Per, et al.
(författare)
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Sulphur dioxide interaction with NOx storage catalysts
- 1999
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Ingår i: Applied Catalysis B: Environmental. - 0926-3373 .- 1873-3883. ; 22:4, s. L241-L248
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Tidskriftsartikel (refereegranskat)abstract
- The effect of SO2 on the NOx storage capacity and oxidation and reduction activities of a model Pt/Rh/BaO/Al2O3 NOx storage catalyst was investigated. Addition of 2.5, 7.5 or 25 vol. ppm SO2 to a synthetic lean exhaust gas caused deactivation of the NOx storage function, the oxidation activity and the reduction activity of the catalyst. The degree of deactivation of the NOx storage capacity was found to be proportional to the total SO2 dose that the catalyst had been exposed to. SO2 was found to be accumulated in the catalyst as sulphate.
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| 2. |
- Fröling, Morgan, 1966, et al.
(författare)
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Oily Waste Composting
- 1996
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Ingår i: AUZO'96 International Conferece on Analysis and Utilisation of Oily Wastes.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 3. |
- Kriz, Dario, et al.
(författare)
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Preparation and characterization of composite polymers exhibiting both selective molecular recognition and electrical conductivity
- 1995
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Ingår i: Biomimetics. - 2313-7673. ; 3:2, s. 81-90
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Tidskriftsartikel (refereegranskat)abstract
- Electrically conducting composite particles were manufactured consisting of a morphine-imprinted methacrylic acid-ethyleneglycoldimethacrylate copolymer interpenetrated with a polypyrrole network. The imprinted polymer was first prepared and then used as a host polymer into which pyrrole monomer was adsorbed. After partial drying of the pyrrole-saturated host polymer, an oxidant was adsorbed, whence polymerization took place. The resulting composite was found to have retained its molecular recognition properties and obtained electrical conductivity. Characterization of the composite particles was performed by scanning electron microscopy, energy-dispersive X-ray analysis, pore volume and surface area measurements, and elemental analysis. Potential applications of these composite polymers, especially in sensor technology, are discussed.
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| 4. |
- Pettersson, Thomas, 1966
(författare)
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The effects of variations of water quality on the partioning of heavy metals in a stormwater pond
- 1999
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Ingår i: In: Proc. 8th International Conference on Urban Storm Drainage, Sydney, Australia, 30 August-3 September 1999. ; 4, s. 1943-1946
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Konferensbidrag (refereegranskat)abstract
- Heavy metals are contaminants of stormwater and significant concentrations are found in the dissolved phase, which has a biological importance. Stormwater ponds have been used more and more for treatment of urban runoff to reduce hazardous constituents such as heavy metals. In this study the partitioning of heavy metals in particulate-bound and dissolved phases are investigated in relation to varying water quality parameters such as pH, dissolved oxygen contents and specific conductivity in a stormwater pond in Göteborg, Sweden. The results show a clear variation in heavy metal partitioning and that lead seems to be more extensively particulate-bound due to high specific conductivity.
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| 5. |
- Ramström, Olof, et al.
(författare)
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Recent Advances in the Use of Molecularly Imprinted Materials in Separation and Synthesis
- 1998
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Ingår i: Molecular and Ionic Recognition with Imprinted Polymers. - Washington, DC : American Chemical Society. - 0097-6156. - 9780841235748 - 9780841216853 ; 703, s. 82-89
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Bokkapitel (refereegranskat)abstract
- Molecularly imprinted materials, prepared using self-assembly imprinting protocols using only non-covalent interactions, can be used as chromatography media in aqueous phase. The recognition properties are highly dependent on the interacting species used in the imprinting protocol. Ionic interactions, together with strong hydrogen bonding, represent useful means of obtaining recognition. With increasing levels of water in the recognition media, the hydrophobic effect comes into play. Molecularly imprinted materials can furthermore be used as auxiliary agents in enzymatic syntheses in water-saturated organic phases. When materials molecularly imprinted for the reaction product were applied to the thermolysin-catalyzed aspartame synthesis, an increase in yield was observed. Introduction of a thermodynamic trap provided by the molecularly imprinted matrices allowed a non-favorable equilibrium for the thermolysin reaction to be pushed in the forward direction.
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| 6. |
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| 7. |
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| 8. |
- Svanström, Magdalena, 1969, et al.
(författare)
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A Method for Analysing the Gas Phase in Polyurethane Foam
- 1995
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Ingår i: Journal of Cellular Plastics. ; 31, s. 375-388
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Tidskriftsartikel (refereegranskat)abstract
- A method for analyzing the gas phase in polyurethane foam is described. The gas content of the foam sample is released by grinding in a special sampling equipment made from a metal pipe. The grinding is effected by pressing the cylindrical sample towards a rotating edge at the end of the pipe. The gas released during grinding is collected in a glass syringe, permitting the total gas volume to be determined. The syringe is connected to two gas sampling valves of a gas chromatograph. In the chromatograph, the gas is analysed on two different columns. For the qualitative analysis of samples with unknown gases and for the identification of impurities, a gas chromatograph—mass spectrometer system is used. Since the sampling equipment, with the sample inserted, is flushed with an inert gas before grinding, the "true" volume of the sample can be determined and the pressure in the cells can be calculated.
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