Soybean Agglutinin [HRP]

Pt-Sn alloy nanoparticles supported on inert SiO2 were prepared and used in the dehydrogenation of propane. The bulk/surface properties of Pt-Sn alloys during reactions and regeneration reactions and regenerations were investigated by transmission electron microscopy, X-ray diffraction, X-ray absorption fine structure, and X-ray photoelectron spectroscopy. Thermogravimetric analysis showed that small amounts of coke formed on the reacted catalysts, and the Pt-Sn interactions were also weakened during the reaction. Sn enrichment occurred on the catalyst surface after the first and second reaction cycles. Fortunately, a small amount of co-fed H-2 inhibited Sn segregation from Pt-Sn alloys and retained the active structure. The regeneration processes, especially the "oxidation-reduction" method, strengthened Pt-Sn interactions while concurrently burning off coke, allowing partial recovery of the catalytic performance. This work indicates the key role of the special geometric arrangements of Pt-Sn alloys in the dehydrogenation of propane.

CoMo/reduced graphene oxide (rGO) catalyst was synthesized for the oxidative desulfurization process (ODS) of dibenzothiophene (DBT) in n-decane. Parameters including total metal (Co and Mo) loading, Co/Mo and CA (citric Acid)/Mo molar ratios were investigated toward achieving optimum conditions. The catalysts were characterized by the XRD, ICP, FTIR, Raman Spectroscopy, BET-BJH, NH3-TPD, XPS, and TEM methods. The product sulfur content was measured by the ICP-OES while the product was evaluated using FTIR and 1H NMR analyses. All experimental stages were designed using Design-Expert software. High BET area, acidity, uniform particle size, and Co-promoter played key roles in this performance. Results revealed 99% for the DBT conversion in 1 h using CoMo (20)/rGO catalyst. The density functional theory (DFT) showed enhancement of interaction energy of the DBT by about 1215 kJ/mol. This emphasized the observed faster ODS reaction. Besides, it was demonstrated that the charge was transferred mainly from rGO to CoMo amplifying both production of interfacial built-in electric field and electrostatic interaction of DBT with the catalyst surface.