ChemCatChem最新文献

The Front Cover highlights an immobilization method of four Keggin-type polyoxometalates (POMs) ([H₂W₁₂O₄₀]⁶⁻, [BW₁₂O₄₀]⁵⁻ [SiW₁₂O₄₀]⁴⁻, [PW₁₂O₄₀]³⁻) by using the reaction with an ionic liquid, 1-butyl-3-vinylimidazolium (BVIM) bromide. The reaction yields a hybrid material (BVIM-POM) as a water-insoluble salt. Cross polarization ¹H-³¹P NMR evidenced the presence of BVIM in the structure of (BVIM)₃[PW₁₂O₄₀]. The salt is mixed with carbon powder and Nafion to prepare an ink and casted on glassy carbon electrodes. The electrochemical behavior of immobilized POMs material is preserved while the electrochemical activity for nitrite reduction is measured. Differential electrochemical mass spectrometry (DEMS) shows the formation of NO and N₂O. More information can be found in the Research Article by Laurent Ruhlmann, Vasilica Badets, and co-workers (DOI: 10.1002/cctc.202400226).

The Cover Feature depicts a composite of processable conjugated polyelectrolytes and ionomers, forming a photocatalytic thin film with visible light activity. This film facilitates the creation of stable, versatile, and scalable photoreactors with enhanced charge separation and transfer for diverse photocatalytic applications. More information can be found in the Research Article by Jeehye Byun and co-workers (DOI: 10.1002/cctc.202400981).

The Front Cover visualizes competing pathways in ethylene oligomerization including dimerization, isomerization and trimerization, investigated by Jianwen Jiang and co-workers on defective HKUST-1 supported metal hydrides through density functional theory calculations. The microscopic insights would facilitate the rational design of new catalysts based on metal-organic frameworks for selective ethylene oligomerization. More information can be found in the Research Article by J. Jiang and co-workers (DOI: 10.1002/cctc.202400906).

The Cover Feature depicts the award ceremony of a tournament. Several teams of chemists faced off to find a new organic base to replace the costly 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD). Each team investigates one base, displayed on the banners hanging in the room. The ceremony celebrates the winner of the study, i.e., 1,1,3,3-tetramethyl guanidine (TMG). This illustration creatively conveys the essence of the research presented by Coralie Jehanno and co-workers, emphasizing the economic competitiveness and efficiency of the TMG base over the existing TBD system. More information can be found in the Research Article by C. Jehanno and co-workers (DOI: 10.1002/cctc.202400215).

RETRACTION: J. Thayssen, W. Riedel, T. Risse, A. Staubitz and A. Wittstock, “Nanoporous Au/Ag Catalyzed Benzylic sp³C−H Oxidation of 9H-Fluorene Derivatives and Similar Molecules With TBHP,” ChemCatChem 2024, 16, e202301695, https://doi.org/10.1002/cctc.202301695.

The above article, published online on 25 March 2024 in Wiley Online Library (wileyonlinelibrary.com), has been retracted by agreement between the authors; the journal Editor-in-Chief, Sandra González Gallardo; and Wiley-VCH GmbH, Weinheim. Following publication, the authors noticed that for some experiments, there might have been cross-contamination with another catalyst due to an insufficient cleaning procedure by laboratory dish washer only. As it is unclear which experiments are affected, all need to be reproduced. The authors intend to repeat experiments to produce correct data. Since repetition of experiments will take considerable time and the editors cannot be certain that new data will not affect the conclusions of the study, they have decided it is appropriate to retract the article.

X. Li, H. Xin. Metal Oxides Derived from Perovskite or Spinel for the Selective Hydrogenation of α,β-Unsaturated Aldehydes: A Mini–Review, ChemCatChem, 2024; 16: e202301483.

In the main text, Table 1 and Table 2 were mistakenly deleted.

We apologize for this error.

Table 1 Mixed metal oxides with perovskite or spinel structure as supports to load noble metal NPs for the selective hydrogenation of α,β-unsaturated aldehydes.

Table 2 Mixed metal oxides with perovskite or spinel structure as catalyst precursors or as catalyst for the (transfer) hydrogenation of α,β-unsaturated aldehydes.

The Front Cover depicts the stages ethanol follows during its conversion to n-butanol over a bifunctional catalyst, and the use of probe molecules and spectroscopy to interrogate catalytic sites. Applying a combination of in-situ FTIR, CO₂-TPD, and operando titration, Wei Tian and José Herrera use carbon dioxide and acetic acid to identify and quantify catalytically relevant functionalities responsible for C–C couplings. Their findings indicate n-butanol formation catalyzed by MgAlO systems is regulated by α-carbon proton abstraction taking place only over strong basic centers. More information can be found in the Research Article by Wei Tian and José E. Herrera (DOI: 10.1002/cctc.202400225).

The Cover Feature points to the work of M. Laura Martínez and co-workers, who investigated the effect of incorporating cobalt oxide nanoparticles into mesoporous materials, specifically SBA-15 and mesoporous cellular foam (MCF). The catalytic activity of Co-MCF was found to be higher in the oxidation reactions of methyl phenyl sulfide, resulting in improved yields and selectivity towards sulfone formation. This enhanced performance can be attributed to the larger quantity of CoO present, which facilitates the formation of catalytically active complexes such as [Co-OOH(Co3+)]. More information can be found in the Research Article by M. Laura Martínez and co-workers (DOI: 10.1002/cctc.202400836).

The Front Cover illustrates how different alkali metal cations influence the cathodic corrosion of gold surfaces. Polarizing gold at highly negative potentials results in various structures: nanoporous surfaces with CsOH, spherical nanoparticles and triangular pits with KOH, octahedral nanocrystals with NaOH, and triangular pits with LiOH. The study presented here also highlights the crucial role of electrolyte purity, as trace iron and nickel impurities in CsOH significantly impact cathodic corrosion. More information can be found in the Research Article by Mohamed M. Elnagar, Ludwig A. Kibler, and Timo Jacob (DOI: 10.1002/cctc.202400526).