EFFECT OF PORE STRUCTURE AND SURFACE CHEMISTRY OF MESOPOROUS SILICA ON MONOGLYCERIDES ADSORPTION IN BIODIESEL
Keywords:monoglycerides, adsorption capacity, pore structure, surface chemistry, mesoporous silica
The effect of pore structure and surface chemistry of mesoporous silica on the adsorption of monoglycerides in biodiesel were evaluated by three kinds of mesoporous silica (bimodal mesoporous silica (BMS), unimodal mesoporous silica with Pluronic P123 (UMS-P123) and unimodal mesoporous silica with CTAB (UMS-CTAB)) was obtained from a silica derived from rice husk ash with Pluronic P123 and CTAB as the structure-directing agents by using the sol-gel technique. The characteristics of BMS were analyzed by TEM, XRD, FT-IR, and N2 physisorption isotherm techniques, and were used for the monoglycerides adsorption in biodiesel. Batch experiment was carried out with commercial palm oil biodiesel under the stirring rate of 150 rpm at 75˚C, using 1 wt% of adsorbent. As, the results, BMS with large mesopore was obtained from SBA-15 typed Pluronic P123 and the small mesopore was obtained from CTAB. The results showed that higher adsorption capacity of BMS (0.0232 mass% gBMS-1) than that of UMS-P123 (0.0215 mass% gUMS-P123t-1) and UMS-CTAB (0.0204 mass% gUMS-CTAB-1) for monoglycerides adsorption into 20 min. The kinetics of data obtained were better fit with pseudo-second order and the adsorption process was consistent with the boundary layer and the intraparticle diffusion.
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