Preparation, characterization, and application of ordered mesoporous S2O82−/ZrO2–SiO2 with high specific surface area
A series of ordered mesoporous S 2 O 8 2−/ ZrO 2 –SiO 2 (OMSZS) solid superacids with different calcination temperatures (400–650 °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-dipping method. Transmission electron microscopy and small-angle X-ray diffraction results showed that the OMSZS were all ordered. The nitrogen adsorption results indicated that the specific surface area of OMSZS could reach up to 331–385 m 2 /g, whereas the average pore diameters were in the range of 3.1–3.2 nm. The pyridine infrared results mainly displayed Lewis acids, and the ammonia (NH 3 )-temperature programmed desorption characterization showed that the NH 3 desorption of the OMSZS calcined at 550 °C was 61 cm 3 /g STP. The catalytic performance of the OMSZS was investigated by the transesterification reaction of waste frying oil and methanol. The yield of fatty acid methyl ester could reach up to 94% at 200 °C reaction temperature for 6 h. After repeated use for four times, the catalyst still featured good activity and the yield was 78%.
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