structure and bonding give a better explanation of the total number of electrons that bond to form a new compound. It also gives both the geometry of an atom and the non-bonding electrons.Answer and Explanation: We first draw the Lewis structure for S...
The initial Ga/SiO2and Zn/SiO2pre-catalyst was synthesized following previously reported methods22,23, and the structure was determined by in situ X-ray absorption spectroscopy (XAS), including both XANES and EXAFS (Supplementary Table1) and compared to that of Ni/SiO2. The catalysts were dehydr...
Based on the integrated absorbance of Lewis/Brønsted acid bands and molecular absorption coefficients [73], the concentrations of Lewis and Brønsted acid sites were estimated to be 42.3 and 1.3 μmol/g, respectively. These results indicate that the WO3-20SiO2-0.5 catalyst possesses mainly ...
field emission scanning electron microscopy (FESEM), vibrating sample magnetometer (VSM) analysis, X-ray powder diffraction (XRD) technique, energy-dispersive X-ray spectroscopy (EDX), and thermogravimetric analysis (TGA) were used to characterize the structure of core–shell...
The final structure is found through geometry optimization. As applied to heterostructures, the result of such modeling depends on the choice of one or another polymorphic modification of SiO2. To choose the most adequate one, it is necessary to go through all possible variants and compare their ...
The crystal structure of the Fe3O4 NPs conforms to a cubic system with lattice parameters and d-spacing of 0.29 nm for the miller index of the major peak (311). For the lattice parameter and particle size of Fe3O4 NPs generated at varied temperatures, comparable findings were noticed. It...
Characterization of the crystal structure of the particles in the toothpaste by X-ray diffraction was provided by NanoDefine project partners and confirmed the presence of alpha-Al2O3 (corundum, crystallite size of 26 nm) and TiO2 anatase (crystallite size of 36 nm) particles in the toothpaste...
Keywords: catalytic adsorbent; NaY zeolite; regeneration; X-ray absorption fine structure; CO-induced Pt aggregation 1. Introduction The effluents from industrial processes often contain VOCs (volatile organic compounds), which pose a threat to human health and the environment [1–3]. For low VOC...