The Zn or Fe can increase mainly Lewis acidity of the SZA, and the total acidity of samples decrease in the following order: Zn–Fe–SZA > Zn–SZA > Fe–SZA > SZA. The Fe–Zn–SZA catalyst exhibits the best catalytic activity for n-pentane isomerization. The isopentane yield of the ...
The La-Ni-S2O82-/ZrO2-Al2O3 (La-Ni-SZA) was prepared and the effect of La and Ni on the structure and isomerization performance of catalyst was investigated. The addition of La could lead to a higher dispersion of metal and more acid sites. The addition of Ni can promote redox ...
The average oxidation state of the 2 H atoms in H2S2O8is +1. ElementOxidation Number (Avg)AtomsCountElectronegativity O-7/4-2 (×6), -1 (×2)83.4 S+6+6 (×2)22.6 H+1+1 (×2)22.2 🛠️ Calculate Oxidation Numbers Instructions ...
The presence of superacid sites (Brønsted and Lewis acid sites) on the surface of the catalyst was conf i rmed by NH 3 -TPD and FT-IR analysis. The silica-supported catalyst (S 2 O 82−/TiO 2 –SiO 2 ) exhibited high catalytic activity for free fatty acid (FFA) about a ...
The Zn or Fe can increase mainly Lewis acidity of the SZA, and the total acidity of samples decrease in the following order: Zn–Fe–SZA > Zn–SZA > Fe–SZA > SZA. The Fe–Zn–SZA catalyst exhibits the best catalytic activity for n-pentane isomerization. The isopentane yield of the ...
The Zn or Fe can increase mainly Lewis acidity of the SZA, and the total acidity of samples decrease in the following order: Zn-Fe-SZA > Zn-SZA > Fe-SZA > SZA. The Fe-Zn-SZA catalyst exhibits the best catalytic activity for n-pentane isomerization. The isopentane yield of the Zn-Fe...
To calculate the oxidation numbers for As2O8Zn3, count the number of atoms, draw the lewis structure by adding bonds, assign electrons from each bond, and count the number of electrons assigned to each atom. Count Atoms Use the chemical formula, As2O8Zn3, to count the number of atoms of...
The pyridine infrared results mainly displayed Lewis acids, and the ammonia (NH3)-temperature programmed desorption characterization showed that the NH3 desorption of the OMSZS calcined at 550 °C was 61 cm/g STP. The catalytic performance of the OMSZS was investigated by the transesterification ...
A series of ordered mesoporous S2O82-/ZrO2-SiO2 (OMSZS) solid superacids with different calcination temperatures (400-650 degrees C) was synthesized using zirconium n-propoxide and tetraethyl orthosilicate as the raw materials and P123 as a structure-directing agent by solvent evaporation-post-...
Combining FT-IR, Py-IR, and BET analysis, it was found that SC-RF-600 formed more O=S=O characteristic functional groups, higher Lewis acid density, and larger specific surface area, which verified the crystal structure and the microstructure of the catalyst. XPS analysis results further ...