Further, generally there is an elongation of Sn-ligand distances in the gas phase structures. These two key observations point to the importance of crystal packing effects on molecular geometry as well on the derived interatomic parameters.doi:10.1524/ncrs.1998.213.14.55Yoram Barzel...
γ-Al2O3 is one of the most widely used catalysts or catalyst supports in numerous industrial catalytic processes. Understanding the structure of γ-Al2O3 is essential to tuning its physicochemical property, which still remains a great challenge. We repo
structureintermsofthepositionofringcleavage(17).The searchonthisclassofcatalysts(1–3).Comparedtotheconversionofn-heptanewasusedtomodelthereactionsthat catalystscontainingonlyPt,bimetalliccatalystsaremoremayoccurintheindustrialprocess.Thereisacompetition
The newly implemented EPE method was found to perform well for describing structure and adsorption properties of Lewis acidic centers of the polar (0001) surface known for its strong relaxation with respect to the bulk terminated geometry. The calculated data are stable with respect to the size ...
Density functional molecular cluster calculations have been used to investigate the coordination of CO to Lewis acid sites ( L) available on Ti O (1 0 1 2) and V O (1 0 1 2) non-polar surfaces. The electronic structure of the clean substrates, the adsorbate geometry and chemisorption ...
comparison to MeAl, MaAl possessed higher acidity (Lewis acid) and the peak at 2θ = 31.7o, representing the reflection plane with aluminum in tetrahedral position [44,45], only observed clearly for MaAl (Figure 5 and Figure S5), demonstrated a high portion of AlO4 in the structure of ...
γ-Al2O3, the focus of this work, is widely used as a methanol dehydration catalyst due to its low cost, compared to zeolites and other aluminosilicates, and due to the presence of Lewis acid sites of moderate strength, which lead to high DME selectivity; the presence of strong ...
The Lewis acid sites could activate the electronic doublet of oxygen [53,73,74]. In any case, the presence of a nanocatalyst creates an ionic environment that favors the heterolytic reactions. In the case of aromatic compounds such as phenol, the ring-opening reaction can be produced either...
Additionally, there are peaks belonging to the CoAl2O4 structure that correspond to F2g (607 cm−1, 191 cm−1) and Eg (480 cm−1) [27]. The peak of CoAl2O4 is difficult to observe due to its weak intensity and coverage by Co3O4. The A1g peak in the figure shows that ...
Lewis Acid Strength of Interfacial Metal Sites Drives CH3OH Selectivity and Formation Rates on Cu-Based CO2 Hydrogenation Catalysts. Angew. Chem. Int. Ed. 2021, 60, 9650–9659. [Google Scholar] [CrossRef] Mao, D.; Zhang, H.; Zhang, J.; Wu, D. The influence of the compositions and ...