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Article
Chemistry, Physical
Blake MacQueen et al.
Summary: This study elucidates the reaction kinetics of the simultaneous hydrodeoxygenation of xylitol over a ReOx-Pd/CeO2 catalyst, determining the activation energy through Arrhenius and non-Arrhenius kinetics. The activation energy was found to vary depending on temperature, with no internal or external mass transfer limitations present in the reaction.
Article
Chemistry, Physical
Yumei Luo et al.
Summary: Thin films of Ca-doped double perovskite, PrBa0.7Ca0.3Co2O5+delta (PBCC), were epitaxially grown on (001) SrTiO3 and were found to undergo rapid oxidation-reduction reactions under H-2 and O-2 gas flow at different temperatures. The films exhibited negative resistance at high temperatures and positive resistance at lower temperatures when switched to O-2 gas, which may be attributed to the diffusion of H atoms within the film. These findings suggest potential applications of PBCC thin films in oxygen sensors and SOFC cathodes.
Article
Chemistry, Physical
Ana S. Dobrota et al.
Summary: Studies have shown that SAC metal centers are not clean in the water thermodynamic stability region, but are covered with H-ads, OH-ads, or O-ads, with some cases leading to the restructuring of metal sites due to oxygen incorporation.
Article
Chemistry, Physical
Yamen AlSalka et al.
Summary: The study investigated the photocatalytic hydrogen evolution from oxalic acid and found that the photo-Kolbe reaction mechanism contributed to the generation of a small amount of formic acid, which disappeared after oxalic acid consumption. Adding KI as an additional hole scavenger had a considerable impact on the reaction mechanism, promoting H-2 evolution to reach the theoretically predictable amount without affecting the oxalic acid degradation rate.
Article
Chemistry, Physical
Isabella Kappel et al.
Summary: This study investigates the crystal imperfections in industrial vanadium phosphorous oxide catalysts and how they affect catalytic performance, providing insights into the selectivity and activity of the catalysts. It highlights the importance of crystal size anisotropy and stacking faults in the crystal structure in determining the properties of the catalyst. The study also reveals a correlation between the extension of coherently scattering domains and the catalyst's selectivity, with higher amounts of beta-VO(PO3)(2) showing increased catalytic activity.
Review
Chemistry, Physical
Michalis Konsolakis et al.
Summary: The rational design and fabrication of highly-active and cost-efficient catalytic materials is crucial in the catalysis field, with shape engineering playing a significant role in influencing the reactivity of catalysts. Shape functionalization can remarkably affect the intrinsic features and reactivity of ceria nanoparticles, leading to the development of highly active and robust materials. By combining ceria nanoparticles with specific structures with various transition metals, multifunctional composites with remarkable activity can be obtained, offering novel catalyst formulations for environmental and energy applications.
Review
Chemistry, Physical
Marco Martino et al.
Summary: This review article summarizes the latest results on the use of platinum-based catalysts for propane dehydrogenation, highlighting the impact of promoters and supports on catalytic activity. It emphasizes the crucial importance of support selection in suppressing coke formation and preventing deep propylene dehydrogenation.
Article
Chemistry, Physical
Mariana N. Catrinck et al.
Summary: In this study, physical mixtures of Nb2O5•nH(2)O and NbOPO4 were prepared to investigate the role of phosphate groups in total acidity and two reactions involving carbohydrate biomass. The acid and catalytic properties were influenced by phosphate group enrichment. The presence of Bronsted sites on the surface favored inulin conversion and NbOPO4 exhibited the best hydrolysis activity with glucose/fructose formation. Additionally, a catalyst with a more phosphated surface showed reduced deactivation during the dehydration of fructose/glucose into HMF.
Article
Chemistry, Physical
Mogbel Alrushaid et al.
Summary: This study focuses on the investigation of electron transfer reactions in Ir-based heterogeneous catalyst system dispersed on a TiO2 support, revealing the importance of bulk Ir atoms in influencing reaction rates and suggesting the dominance of reorganization energy between redox couples in driving the reaction. The study also highlights the potential overestimation of site activity when normalizing reaction rates with surface atoms.
Article
Chemistry, Physical
Agnieszka Drzewiecka-Matuszek et al.
