This article describes the main strategies to activate and convert carbon dioxide (CO2 ) into valuable chemicals over catalytic surfaces. Coherent elements such as common intermediates are identified in different concisely discussed based on reactivity of CO2 with aim understand decisive factors for selective efficient conversion.

Combined experimental infrared (IR) and theoretical approaches have been carried out in an attempt to specify the actual structure of CO2 species adsorbed on magnesium oxide surface. The interaction with regular sites MgO(100), (111), (110) surfaces as well MgO(100) defect (steps, corners, kinks, divacancies) has investigated by means density functional theory study. Theoretical IR frequencies compared experiments show distinguishable carbonate species, different planes defects, vibrating...

Understanding the mechanisms of interactions between zinc-based layered double hydroxides (LDHs) and bacterial surfaces is great importance to improve efficiency these antibiotic-free antibacterial agents. In fact, role surface in activity LDH nanoparticles compared that dissolution generation reactive oxygen species (ROS) still not well documented. this study, we show ZnAl exhibit a strong effect against Staphylococcus aureus by inducing serious cell wall damages as revealed tests atomic...

ZnAl LDH NPs showed remarkable antifungal properties against C. albicans fungal cells. The activity was linked to the adhesion-specific interactions between nanoparticles and , which were probed by both SPFS SCFS.

Catalysts with the strongest basic properties are not always most efficient ones for transesterification, a series of magnesium-based materials, exhibiting large range acido–basic properties, was investigated.

Gas or liquid phase transesterification reactions are used in the field of biomass valorization to transform some platform molecules into valuable products. Basic heterogeneous catalysts often claimed for these applications but role basicity reaction mechanism depending on operating conditions is still under debate. In order compare catalyst properties necessary perform a both and gas phases, ethyl acetate methanol, which can be easily processed two were chosen as reactants. The studied MgO,...

Solid materials possessing basic properties are naturally covered by carbonates and hydroxyl groups. Those natural adsorbates modify their chemical reactivity. This article aims to specifically evidence the role of surface hydroxyls in heterogeneous catalysis on MgO. It compares catalytic behaviors hydroxylated or carbonated MgO surfaces for two types reactions: one alkene isomerization alcohol conversion (hept-1-ene 2-methyl-3-butyn-2-ol conversion). Catalysis experiments showed that carbon...

Abstract This study aims to reveal how water adsorbed on a solid can influence its catalytic properties for transesterification in liquid phase. A commercial magnesium silicate was subjected range of thermal pretreatments and used the ethyl acetate with methanol. Conversion decreased increasing pretreatment temperature, direct relation release content silicate. Thermogravimetric analysis, diffuse reflectance infrared Fourier transform (DRIFT), 1 H NMR spectroscopies revealed that physically...

Due to the constraints associated with diffusion and mixing time, traditional kinetic thermodynamic approaches were inadequate for probing true mechanism of interaction between chromate Layered Double Hydroxide (LDH). To circumvent these limitations, colloidal suspensions Mg/Al-NO3 LDH, characterized by a positively charged surface (approximately +50 mV) in ultrapure water mean average diameter 140 nm, allowing formation stable days, swiftly mixed Cr(VI) at both pH = 4 9 using stopped flow...

This article reports for the first time synthesis of an LDH using only manganese as divalent and trivalent metallic ion. Analysis pH, redox potential, chemical composition during oxidation a basic salt persulfate indicates 1/3 initial MnII ions, in agreement with paramagnetic structure XPS analysis. Infrared, Raman spectra thermogravimetric analysis results were similar to ones obtained Fe-LDH also known green rust. X-Ray diffractograms Rietveld refinement used determine this solid....

We present the first in situ $W$-band (94-GHz) electron paramagnetic resonance (EPR) study of a trapped center thin MgO(001) films. The improved resolution high-field EPR experiments proves that signal originate from well-defined species bulk films, whose projection principal $g$-tensor components onto (001) plane are oriented along [110] direction MgO lattice. Based on comparison between structural properties knowledge ability defects to trap electrons, and signal, it is possible propose...

A new ultrahigh vacuum (UHV) electron paramagnetic resonance (EPR) spectrometer operating at 94 GHz to investigate centers on single crystal surfaces is described. It particularly designed study well-defined model catalysts using epitaxial thin oxide films grown metal crystals. The EPR setup based a commercial Bruker E600 spectrometer, which adapted conditions home made Fabry Perot resonator. key idea of the resonator use planar required grow crystalline as one mirrors spectroscopy solely...

The Cover Feature portrays the four main means (heroes), namely heat, light, electric and solar power, to activate CO2 for its transformation useful chemicals. This Concept article describes unifying theoretical views of activation over catalytic surfaces how product selectivity arises in a general manner. More information can be found by A. Álvarez et al. on page 3135 Issue 22, 2017 (DOI: 10.1002/cphc.201700782).

The hydrogenation of triple and double carbon–carbon bonds in C4 molecules containing a single unsaturation has been investigated for the lowest index surfaces triad Ni, Pd, Pt through first-principles simulations. Both low high hydrogen coverage have explored to identify nature selectivity found experiments. adsorption behavior alkynes alkenes at concentrations differs from structures infinite dilution-limit which makes significant contribution selectivity. Structure sensitivity is also...

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The structural, spectroscopic and electronic properties of Na K birnessites were investigated from ambient conditions (bir

Iron and cobalt monometallic Layered Double Hydroxide (LDH), combining divalent trivalent cations of the same chemical element, are commonly used respectively for nitrate reduction oxygen evolution reaction. This article reports first synthesis a LDH using only manganese as metallic ion. X-Ray diffractograms, infrared Raman spectra show that structure obtained through oxidation basic Mn II salt with persulfate is comparable to Fe-LDH also known Green Rust. XPS shows in this solid coexist III...

Antifungal resistance has become a major serious concern, and Candida albicans is considered as one of the most opportunistic fungal pathogens responsible for several human infections. In this context, use new antifungal agents such zinc-based layered double hydroxides to fight possible mean help limit problem resistance. study, we show that ZnAl LDH nanoparticles exhibit remarkable properties against C. cause cell wall damages revealed by growth test atomic force microscopy (AFM) imaging....