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Simon Smolders

Simon Smolders
KU Leuven | ku leuven · Department of Microbial and Molecular Systems (M²S)

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36
Publications
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Introduction
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Publications

Publications (36)
Article
Herein, we report the synthesis of new catechol-based porous polymers and their use as platforms for the heterogenization of molecular Cu complexes. The resulting Cu@CatMP-1 materials proved to be highly stable and performing catalysts for the oxidation of secondary alcohols with turnover numbers up to 6000, about 1 to 2 order of magnitude more tha...
Article
Hypothesis Layered double hydroxide (LDH) loaded with orthophosphate (PO4) are suggested as slow-release P fertilizers. However, PO4-LDHs have a low maximal P content, related to high charge HPO4²⁻/PO4³⁻ anions occupying the anion exchange capacity (AEC) of LDHs. We postulate that the P content of LDHs can be enhanced by exchanging them with polyme...
Article
Recently, a reaction sequence was developed for the production of tricarballylic acid, an interesting plasticiser precursor, from citric acid by using a H-Beta zeolite and Pd/C catalyst. Although yields of 85% of tricarballylic acid were obtained, citric acid elicited Al leaching from the zeolite framework, resulting in loss of activity. In this wo...
Article
This work establishes structure-property relationships in Ru-based catalytic systems for selective hydrodeoxygenation of ketones to alkenes by combining extensive catalytic testing, in situ X-ray absorption spectroscopy (XAS) under high pressures...
Article
Full-text available
The effect of solvent has been investigated for the synthesis of bismuth gallate compounds, of which the water-based bismuth subgallate has been used as an active pharmaceutical ingredient (API) for over a century. Using methanol as a solvent, two new bismuth gallates were acquired: first a flexible 3-periodic metal-organic framework (MOF) forms, w...
Article
In this study, a water-stable microcrystalline bioMOF was synthesized, characterized, and loaded with silver ions or highly emissive rare earth (RE) metals like Eu ³⁺ /Tb ³⁺ . The obtained materials were used used...
Article
The catalytic activity of metal-organic frameworks (MOFs) toward peptides and proteins provides an attractive route for the development of nanozymes for applications in biotechnology and proteomics, particularly in the field of protein identification using mass spectrometry. Here, we report that carefully tuning the Ce/Zr metal ratio is a promising...
Article
The formation of diaryl ethers is generally achievedviatransition metal catalyzed etherification reactions (Ullmann, Chan-Lam, Buchwald-Hartwig) with prefunctionalized aryl halide substrates at elevated temperatures. Herein, we report a protocol for electrochemical C(sp²)-H/O-H cross-dehydrogenative coupling of phenols and tertiary anilines to synt...
Article
Consistent structure-performance relationships for the design of MOF (metal-organic framework)-based mixed-matrix membranes (MMMs) for gas separation are currently scarce in MMM literature. An important step in establishing such relationships could...
Article
The catalytic activity of UiO-66 type Zr metal-organic frameworks can be tuned by the linker employed, e.g. nitro- or aminoterephthalic acid. Here we study composition-activity relations for the UiO-66 catalyzed dehydration of fructose into hydroxymethylfurfural, a carbon-neutral feedstock for chemicals and fuels. Variation of the substituents on t...
Article
Full-text available
Structural parameters influencing the reactivity of metal organic frameworks (MOF) are challenging to establish. However, understanding their effect is crucial to further develop their catalytic potential. Here, we uncovered a correlation between reaction kinetics and the morphological structure of MOF-nanozymes using the hydrolysis of a dipeptide...
Article
Cerium oxide clusters have been incorporated in a porous metal-organic framework to increase their activity for the selective catalytic reduction (SCR) of NO with NH3. In addition, a new set...
Article
A copper-exchanged H-USY zeolite catalyst was developed for the direct C‒H amination of azoles with secondary amines in HFIP. The reaction was performed under air without any external additive. The...
Article
Modulator mediated functionalization (MoFu) is introduced as a new and versatile platform tool to improve the separation performance of MOF-based membranes, exemplified here by the creation of mixed-matrix membranes (MMMs) with enhanced CO2 separation efficiency. The unique structure of MOF-808 allows incorporation of CO2-philic modulators in the M...
Article
A series of transition metal-based double metal cyanides (DMCs) were studied as catalysts for the synthesis of nitriles via acid-nitrile exchange reaction. The best nitrile yields were obtained with Co 3 [Co(CN 6 )] 2 ...
Article
Full-text available
Metal–organic frameworks (MOFs) are emerging materials for luminescent and photochemical applications. Armed with femto to millisecond spectroscopies, and fluorescence microscopy, the photobehaviors of two Ce‐based MOFs are unravelled: Ce‐NU‐1000 and Ce‐CAU‐24‐TBAPy. It is observed that both MOFs show ligand‐to‐cluster charge transfer reactions in...
Article
Full-text available
The less polar phase of liquid‐liquid extraction systems has been studied extensively for improving metal separations, however, the role of the more polar phase has been overlooked for far too long. Here, we investigate the extraction of metals from a variety of polar solvents and demonstrate that, the influence of polar solvents on metal extractio...
Article
Six different chiral and achiral alkane dicarboxylic C4-acids, i.e. succinic acid (H2SUC), DL-2-methylsuccinic acid (H2MS), 2,3-dimethylsuccinic acid (H2DMS) and aspartic acid (D , L- and DL-H2ASP), were used to obtain Ce(IV)-MOFs via microwave assisted reactions. In water-based syntheses , MOFs with three different topologies, denoted as UiO 66 (f...
Article
While titanium‐based metal‐organic frameworks (MOFs) have been widely studied for their (photo)catalytic potential, only a few TiIV MOFs have been reported due to the high reactivity of the employed titanium precursors. Here, we present the synthesis of COK‐47, the first Ti carboxylate MOF based on sheets of TiIVO6 octahedra, which can be synthesiz...
Article
While titanium‐based metal‐organic frameworks (MOFs) have been widely studied for their (photo)catalytic potential, only a few TiIV MOFs have been reported due to the high reactivity of the employed titanium precursors. Here, we present the synthesis of COK‐47, the first Ti carboxylate MOF based on sheets of TiIVO6 octahedra, which can be synthesiz...
Article
Bipyridine-based UiO-67 Metal-Organic Frameworks (MOFs) are for the first time successfully applied as filler material in Matrimid mixed-matrix membranes (MMMs). Extensive characterization of fillers (via XRD, NMR, SEM, ATR-FTIR, CO2 and N2 physisorption) and membranes (via XRD, SEM, ATR-FTIR, DSC, TGA and PALS) were performed to gain insight in th...
Article
Full-text available
C-H activation reactions are generally associated with relatively low turnover numbers (TONs) and high catalyst concentrations due to a combination of low catalyst stability and activity, highlighting the need for recyclable heterogeneous catalysts with stable single-atom active sites. In this work, several palladium loaded metal-organic frameworks...
Article
Full-text available
The occurrence of metal ion exchange in Zn3[Co(CN)6]2 and Cu3[Co(CN)6]2 Prussian blue analogues (Zn-Co and Cu-Co PBAs) was demonstrated for the first time. While Cu(II) ion exchange easily occurs in Zn Co PBA, the exchange of Cu(II) atoms in Cu-Co PBA by Zn(II) proved to be more difficult. At low to medium Cu(II) loadings, the catalytic activity of...
Article
Full-text available
Stoichiometric reduction reactions of two metal-organic frameworks (MOFs) by the solution reagents MCp*2 (M = Cr, Co) are described. The two MOFs contain clusters with Ti8O8 rings: Ti8O8(OH)4(bdc)6; bdc = terephthalate (MIL-125) and Ti8O8(OH)4(bdc-NH2)6; bdc-NH2 = 2-aminoterephthalate (NH2-MIL-125). The stoichiometry of the redox reactions was prob...
Article
Stoichiometric proton-coupled electron transfer (PCET) reactions of the metal-organic framework (MOF) MIL-125, Ti8O8(OH)4(bdc)6 (bdc = terephthalate) are described. In the presence of UV-light and isopropanol, MIL-125 was photo-reduced to a maximum of 2(e- + H+) per Ti8 node. This stoichiometry was shown by subsequent titration of the photo-reduced...
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The inside cover picture, provided by Cirujano and co‐workers, illustrates the results of their work on recycling catalytic amounts of Pd(OAc)2 in the presence of redox active, stable and reusable metal‐organic microporous frameworks (MOF‐74), thus achieving the C−H functionalization of pharmaceutically interesting aza‐heterocycles with alkenes. Th...
Article
Full-text available
The inside cover picture, provided by Cirujano and co‐workers, illustrates the results of their work on recycling catalytic amounts of Pd(OAc)2 in the presence of redox active, stable and reusable metal‐organic microporous frameworks (MOF‐74), thus achieving the C−H functionalization of pharmaceutically interesting aza‐heterocycles with alkenes. Th...
Article
Full-text available
Layered double hydroxides (LDH) of Mg/Al are anion exchangers that are candidate materials for phosphate (PO4) recovery and recycling from waste streams. However, PO4recycling in agriculture might be limited by incomplete desorption of PO4from the minerals. This study was set up to identify the factors explaining irreversible PO4sorption ("fixation...
Article
A precursor method has been developed to synthesize Ce(IV) MOFs that could not be prepared directly from Ce(IV) salts. Starting from Ce 6 clusters, two Ce-UiO-66 analogues and four tetracarboxylate-based Ce(IV)...
Article
Over the past decade, the zirconium-terephthalate UiO-66 has evolved into one of the most intensely studied metal-organic frameworks (MOFs) to date. Among the most fascinating and pervasive features of this material are defects, and their influence on a multitude of its properties. However, the simultaneous occurrence of two defect types, missing l...
Article
The introduction of Ce4+ as a structural cation has been shown to be a promising route to redox active metal-organic frameworks (MOFs). However, the mechanism by which these MOFs act as redox catalysts remains unclear. Herein, we present a detailed study of the active site in [Ce6O4(OH)4]-based MOFs such as Ce-UiO-66, involved in the aerobic oxidat...
Article
A new reaction sequence of dehydration-decarboxylation-hydrogenation to transform citric acid into methylsuccinic acid, was recently developed using Pd as noble metal catalyst in water. In this work Ni catalysts were investigated as cheap, non-noble metal alternative. Several home-made and commercial catalysts were screened for this reaction. Citri...
Article
Full-text available
A series of nine Ce(IV)-based metal organic frameworks with the UiO-66 structure containing linker molecules of different sizes and functionalities were obtained under mild synthesis conditions and short reaction times. Thermal and chemical stabilities were determined and a Ce-UiO-66-BDC/TEMPO system was successfully employed for the aerobic oxidat...