Process for obtaining adsorbent material based on porous silicates for reduction of sulfur and nitrogen in oil fractions

A process for obtaining porous silicates that can be used as adsorbents for reducing the sulfur and nitrogen contents in petroleum fractions and products derived of, comprising the following steps:

• dissolving an amount of Pluronic 123 (1.6×10−4 M) in water, while simultaneously making an hydrochloric or citric acid solution with a concentration between 1 and 5 molar;
• then, the mixture is heated up to about 40-50° C., while keeping this temperature for about 1 h;
• then, TEOS was added, i.e., 20 to 40 mmol, depending on the material to be processed;
• ethanol is added too and this mixture is kept under constant stifling for about 3 h, then the next step is adding 70 to 75 mmol of 30% H2O2 solution and the main inorganic species abovementioned, this solution is maintained under stirring at 40° C. for a period between 3 and 20 h, then it is aged in autoclave with stirring while rising the temperature up to 100° C., then keeping these condition for a period of 24 h;
• then, the material is filtered out and dried, before refluxing it for getting rid of non-reacted compounds, which procedure is performed using ethanol for a period of 24 hr.;
• the next step consists of filtering and washing the material with ethanol, then drying in an oven at 60° C.;
• finally the material is calcined in air or nitrogen atmosphere for 6 h at 500° C.