Tailored synthesis of organised mesoporous aluminas prepared by non-ionic surfactant templating using a Box-Wilson CCF design

摘要

Organized mesoporous aluminas (OMA) are materials that present interesting properties as catalytic supports in reactions in which bulky molecules are involved. In this work, a number of OMA were prepared using a non-ionic structure directing agent (a tri-block co-polymer). The study of the quantitative influence of some OMA synthesis conditions (water aluminium ratio (H2O: Al), ageing temperature (T_(ag)), and calcination heating rate (r_(cat))) on the resulting OMA textural properties (specific surface area (S_(bet)). pore volume (V_p) and average pore diameter (APD)) was carried out using a Box-Wilson Central Composite Design Face Centred (CCF, a: ±1). The models obtained provided a satisfactory adjustment of the experimental data. H2O: Al was found to be the most influencing model term. The influence of T_(ag) and r_(cat) interactions on S_(BET) and V_p was found to be significant. Representative OMA with well differentiated pore size distributions were characterised by N2 adsorption, XRD and TEM.