Abstract: Six kinds of silane reagents were selected for grafting modification of B-type silicone, the physical and chemical characteristics of adsorption materials were investigated by means of nitrogen adsorption-desorption test, solid-state infrared spectroscopy analysis, thermogravimetric and mass spectrometry analysis, elemental analysis, and toluene adsorption test, and the adsorption performance of diesel was studied bystatic adsorption equilibrium test. The results showed that amino group, sulfhydryl group and epoxy group could be successfully grafted onto silica gel;the specific surface area, total pore volume, most probable pore size, and average pore size of the modified silica gel all decreased;the adsorption amount of toluene was positively correlated with the specific surface area of modified silica gel. According to the different content of nitrogen in modified silicone, the degree of modification reaction was related to the selection of silane reagent.The static test results showed that among the six silane reagents, the amino and epoxy group modified silica gel could improve the selectivity of the adsorbent for bicyclic aromatic hydrocarbons, and could significantly improve the selectivity of the adsorbent for sulfur compounds in diesel fraction. Sulfhydryl modified silica gel could reduce the selectivity of the adsorbent forsulfur compounds, while amino, thiol and epoxy modified silica gel all reduced the selectivity of the adsorbent for monocyclic aromatic hydrocarbons.

Key words: diesel, adsorption separation, modified silica gel, silane reagent, selectivity