This article addresses the utilization of cross-linked phenylboronic-acid polymers for fructose separation from glucose–fructose mixtures focusing particularly on structure-sorption relationships.
The ongoing transition from fossil to renewable feedstocks demands new efficient processes for an economically viable production of biomass‐derived commodities and fine chemicals. Novel energy‐ and material‐efficient product purification and separation will play a crucial role due to altered product and feed composition. The present study comprises the synthesis and tests of cross‐linked p‐vinylphenylboronate polymers for the separation of 18 diols, sugar alcohols, and saccharides, which can be obtained during biomass processing. The separation was based on molecular recognition, that is, esterification of the phenylboronate with vicinal diols. A correlation of the molecular complexation constant, the polymer swelling, and the maximum adsorption capacity was found. The adsorption curves over time were recorded. Preliminary results on competitive adsorption of binary mixtures showed a high potential for the separation of substrates with significantly different complexation constants. Desorption tests implied easier desorption of substrates that only adsorb on the outer polymer shell.
Novel modular catalysts for dry reforming of methane (DRM) based on chemically modified Ni-foams were prepared by a stepwise synthesis method. A dip coating deposition approach using different aluminium oxide precursors allowed access to aluminium oxide coated Ni-foams as novel conceptual approach to catalyst design. The influence of MgO and SiO 2 as promoters was investigated. Scanning electron microscopy analysis confirmed successful deposition. Additionally, the catalysts were characterized by Kr-physisorption, X-ray fluorescence and X-ray diffraction. Comparing the catalytic performances of the different catalysts in DRM emphasised the major importance of the precursor for the nature of aluminium oxide deposition, catalyst activity, and deactivation degree. The mechanism of catalyst deactivation was thoroughly studied by high-resolution scanning electron microscopy and energy dispersive spectroscopy. Additionally, regeneration profiles were investigated. Overall, the presence of aluminium oxide appears to be essential for catalyst activity and the active sites are likely to be at the nickel-alumina interface.Catal. Sci. Technol. This journal is
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