Synthesis of sulfated zirconia to obtain triethyl citrate

ACUÑA, YANINA M.; AGUZÍN, FEDERICO L.; PADRÓ, CRISITINA L.; OKULIK, NORA B.

Santa Fe

Workshop; French-Argentinean Workshop on Heterogeneous Catalysis; 2023

Instituto de Investigaciones en Catálisis y Petroquímica, ?Ing. José Miguel Parera?

The N2 adsorption-desorption isotherm for SZ-10 allowed estimating a specific surfacearea of 264 m2/g and a pore size of 5 nm. The low angle diffraction pattern indicated that thepore structure of the support was preserved. While at extended angle the pattern did not showsigns that could be attributed to any of the crystalline phases of ZrO2, which suggests a gooddispersion on the surface. The EDXRF study confirmed the Si/Zr molar ratio of 10 used in thesynthesis. The absorption bands in the FTIR spectrum were associated with the presence ofbonds with the species with S, Zr, Si and O. The FTIR spectrum of the pyridine showed thepresence of both Brønsted and Lewis acid sites. Potentiometric titration indicated that inaqueous solution this material has high concentration of acid sites, although lower than A36.Catalytic tests showed that catalyst SZ-10 is more active than A36. On SZ-10 completeCA conversion was achieved at 150 minutes of reaction while the selectivity to TEC at the endof the reaction was 47 % on SZ-10 and 14 % on A36 (See Figure 1).