Zhang, Zhi published the artcileAn alumina-coated UiO-66 nanocrystalline solid superacid with high acid density as a catalyst for ethyl levulinate synthesis, Formula: C7H12O3, the main research area is sulfate impregnated zirconia alumina catalyst preparation property; glucose dehydration ethyl levulinate.
The zirconium-containing metal-organic framework (MOF) UiO-66 was used as a cell to synthesize SO42-/ZrO2@Al2O3, a high-d. superacid with relatively strong Bronsted acidity. The UiO-66 MOF was first coated with alumina to form ZrO2@Al2O3. Impregnation with ammonium sulfate and calcination at 500°C afforded the bimetallic composite solid superacid SO42-/ZrO2@Al2O3. RESULTS : Scanning and transmission electron microscopy images confirmed that UiO-66 was successfully coated with aluminum oxide, and its octahedral structure and uniform size (400-600 nm) were retained. SO42-/ZrO2@Al2O3 had a Brunauer-Emmett-Teller sp. surface area of 301-330 m2 g-1 and average pore diameter of 9.6-10.7 nm. XPS and Fourier transform IR anal. showed that SO42-/ZrO2@Al2O3 contained S6+ and Al3+. Temperature-programmed ammonia desorption anal. showed that SO42-/ZrO2@Al2O3 contained super-strong acid sites. The total volume of desorbed ammonia reached 90-109 cm3 g-1. IR spectra of adsorbed pyridine indicated that SO42-/ZrO2@Al2O3 contained mainly Lewis acid sites and was relatively rich in Bronsted acid sites. Thermogravimetric anal. showed that the thermal stability of SO42-/ZrO2@Al2O3 was high. SO42-/ZrO2@Al2O3-3M (the impregnation concentration of ammonium sulfate was 3 mol L-1) and glucose were used to synthesize Et levulinate (EL) in ethanol. The highest EL yield of 37.5 mol% was obtained after reacting the mixture at 200°C for 5 h. An EL yield of 28.8 mol% was obtained after four consecutive reuses of the SO42-/ZrO2@Al2O3-3M catalyst.
Journal of Chemical Technology and Biotechnology published new progress about Dehydration catalysts. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Formula: C7H12O3.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics