Characterizations and Catalytic Activities Investigation of Synthesized Solid-Based Heterogeneous Catalysts in the Esterification Reaction

Abstract

Mesoporous materials functionalized with STA(Silicotungstic acid) have been proved to be efficient catalysts for esterification reactions. In the investigation, impregnation method was applied for the synthesis of STA/MCM-41 catalysts. MCM-41 and STA(Silicotungstic acid) were used to silica source and active material respectively. The active material was loaded by dryimpregnation method after silica source. Molar ratios of catalysts were determined by 1.25, 2.5 and 5% (W/Si). Actually, this molar ratio values are very low for the impregnation method. But catalysts were successfully synthesized by applying impregnation method. And catalytic activities of STA/MCM-41 catalysts were investigated with an ethyl acetate reaction. On the other hand, the second reaction of STA/MCM-41(2.5%) catalyst was carried out in the presence of under identical conditions after the first reaction. Before and after reactions, the physical properties of the catalysts were determined by XRD, DRIFT, BET, SEM and Mapping analysis methods.

Photocatalytic Degradation of Neonicotinoids—A Comparative Study of the Efficacy of Hybrid Photocatalysts

“…In the SEM analysis results (Figure 4a-e), wheat structures belonging to the p6 mm space groups of the calcined SBA-15 [29,44,45] were observed. On the other hand, in the SEM analyses of the uncalcined SBA-15 support material, p6mm space structures were also observed, in addition to the wheat chain structures (Figure 5a,b,d).…”