In this study the problem with the organosilane removing during oxidation of thiol species after submit-synthesis modification was overcome by the applying of various form of organosilane modifier, i.e. 3-(trihydroxysiyl)-1-propanesulfonic acid (TPS), which has already SO3H groupings in its structure. To the better of our data this modifier has not been applied for the technology of acidic catalysts utilizing the submit-synthesis modification process. The purpose of this study was not solely to obtain an environment friendly acidic catalyst but also to considerably shorten the time of modification. On this examine the materials have been ready in a a lot shorter time, i.e. 1 h, with the applying of microwave heating or utilizing the standard modification procedure. All chemicals and supplies used have been bought from commercially obtainable sources and used with out additional purification. 99%), toluene (anhydrous) have been purchased from Sigma-Aldrich. 3-(trihydroxysiyl)-1-propanesufonic acid (30-35% in water) was bought from Gelest. HCl (35%) and acetic acid had been procured from Chempur.
SBA-15 materials was obtained via hydrothermal synthesis. At first a mixture of Pluronic P123 (Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (4 g), HCl (8.76 g) and water (141.24 g) was prepared. The mixture was kept at 313 K and then TEOS (8.527 g) was dropwise added. Finally the mixture was stirred at 313 K for 20 h and then heated at 373 K under static situations for next 24 h. After synthesis the product was washed with water and dried at RT. The template was removed by calcination at 823 K for eight h (temperature ramp 5 K min−1). Prior to the modification, SBA-15 support was heated at 623 K for four h in the oven. 1 g of anhydrous sample was positioned in teflon reactor. Next 50 ml of anhydrous toluene and 1.055 g of TPS answer, i.e. 3-(trihydroxysiyl)-1-propanesufonic acid, were added. The reactor was put into Microwave Labstation (Milestone Microsynth). Mixture obtained was heated at 373 K (temperature ramp 10 K min−1 most power 600 W) from 1 to 4 h.
