Synthesis of sulfated titania and its application in esterification reaction |
Paper ID : 1304-UFGNSM-FULL |
Authors: |
Abstract: |
Sulfated metal oxides have some advantage such as high acid strength, no corrosion for the reactor and free from pollution as compared with traditional liquid acids such as H2SO4, HF, HCl and H3PO4. Among sulfated metal oxides, sulfated titania has attracted worldwide attention because of their wide application in many organic reactions such as esterification, isomerization, acylation, alkylation and so on. In this paper, TiO2 nanocatalyst was synthesized by sol-gel method using titanium tetra isopropoxide (TTIP) as a precursor. Sulfate ions were introduced on titania by impregnation method using ammonium sulfate and sulfuric acid as precursors of sulfate ions. The structural properties of the catalyst were characterized by means of FT-IR and XRD. Figs. 1 and 2 show the XRD pattern and FT-IR spectrum of the [SO42-/TiO2] nanopowder, respectively. The esterification of acetic acid with isoamyl alcohol was used as model reaction to test the catalytic activity of the catalyst. The catalytic activity of the synthesized [SO42-/TiO2] was also compared with [SO42-/TiO2 (P25)] catalyst under the same experimental conditions. The results show that the sulfated titania catalyst with sulfuric acid has higher catalytic activity than other catalysts. A high conversion yield (99%) was obtained at optimum conditions of 120 °C, 240 min, and dosage catalyst of 5 wt% of acetic acid, and alcohol to acid molar ratio of 1:4. |
Keywords: |
Solid acid, Sulfated titania, Esterification, Acetic acid, Isoamyl alcohol |
Status : Paper Accepted (Poster Presentation) |