Adsorptive Removal Of Neutral Nitrogen-Containing Compounds From Model Oil

Energy issue has become more and more important with the rapid development of the economy in C hina. Demand for oil has been gradually increased, but the fuel processing technology maybe aging behind with the removal of large amounts of sulfur and nitrogen oxides. These are known to cause environmental pollution after burning and intensified and threatened the ecological balance further. Therefore, many countries strictly claimed better quality of the oils, but traditional hydrodenitrogenation and hydrodesulfurization processing do not meet legal requirements in many countries. This process requires large amounts of hydrogen, high temperature, high pressure and effective catalyst, whereby the efficiency is low. What is more, the efficiency of hydrodenitrogenation and hydrodesulfurization has been hindered due to neutral nitrogen compounds. More research efforts have been focused on the efficient and environmentally friendly process to make cleaner oil. In recent years, adsorptive removal of nitrogen compounds from oils, oxidation of nitrogen compounds, extraction of nitrogen compounds, biodegradation, adsorption denitrogenation are the most frequent reports as effective removal method of nitrogen compounds due to their simplicity, low cost and more environmentally friendly.Currently, many different types of adsorbents have been mentioned in the literature. The carbon-based material has been subjected to a great deal of interest because of its better adsorption properties of the oil components. Their surfaces are susceptible to oxidation and the introduction of a large number of oxygen-containing functional groups can be more beneficial. The results have shown that with the increase of the oxygen-containing functional groups, oxidation of activated carbon adsorption capacity of indole has increased. The impact is greater than the impacts of the physical properties. Different oxygen-containing functional groups play a different role on adsorption according to the results on oxidized activated carbon after heat treatment. Here the results show that the hydroxyl and carboxyl groups contribute to the adsorption of indole. Due to the oxygen content of graphite oxide is greater than oxidation of activated carbon, and graphite oxide has less class of oxygen-containing functional groups. We have discussed about the adsorption mechanism by heat treatment of graphite oxide. The adsorption capacity is poor due to dispersion、hydrophilic and small layer spacing. We then synthesized of cetyltrimethylammonium bromide- graphite oxide in order to increase layer spacing and make more oxygen-containing functional groups available, and the results suggest indeed that the adsorption capacity is increased. The mechanisms of the adsorption maybe by hydrogen bonding, due to indole and carbazole are belonged to the class of neutral nitrogen compounds. There is no significant acid-base reaction and the adsorbent is easy to regenerate. Given its wide range of sources, and the ease of modification, it has potential to be used to large amounts of nitrogen-containing compounds as well as being regenerated. Therefore, it has a potential for commercial production and the subsequent industrial nitrogen-compounds removal process.