Control of porosity and surface area in TiO2—Al2O3 mixed oxides catalytic supports. A statistical approach

摘要: Abstract The synthesis of TiO2-Al2O3 mixed oxides catalytic supports with a TiO2/(TiO2+Al2O3) molar ratio equal to 0.5 was made, at various experimental conditions, by the co-precipitation corresponding metallic isopropoxides using ammonium carbonate as pore regulating agent. influence preparation parameters (amount carbonate, water and procedure for precipitation isopropoxides) on surface area structure final solid were studied full 23 factorial design. Within conditions used here, model response equations area, cumulative volume mean diameter showed good agreement results. It found that amount most important parameter, affecting three responses in positive way. resulted negative diameter. manner which made also had significant volume. differences may be mainly due an interaction between ions aluminium or titanium hydroxide gels favours link particles leading high areas different porosities depending concentration.