| Fuel is necessary for our society with high-speed industrialization and modernization. Especially, the rapid development of the automobile manufacturing and logistics industry, there is a greatly increasing demand for fuel. After burning, it caused severe environmental pollution problems:such as acid rain, acid smog. The individuals pay close attention to the problem. According to the regulations V, the content of sulfur compounds in gasoline must be lower than 10 ppm, so the deep desulfurization technology is very necessary. Among the current desulfurization technology, adsorption desulfurization technology is considered to be the most promising in the green chemical technology. It has high desulphurization depth, easy regeneration, and low cost, thus has become the focus of the present study. Molecular sieve due to their good specific surface area, abundant pore structure and easily can be modified has been widely used in research on adsorption. This essay chooses the molecular sieve as the carrier, and then optimized them through the type of molecular sieve, method of preparation, and active component. In the meantime, the adsorbents were characterized by XRD, BET,FT-IR, SEM, TG and other methods. The effect of reaction conditions on the adsorption properties of adsorbent also had been studied. Finally, we select a adsorbent which was modified by two kinds of metal, and then explore the effect of dynamic adsorption conditions on the adsorption performance. The regeneration performance of adsorbent also had been discussed, the main research content is as follows:First of all, the single metal modified molecular sieve adsorbents were prepared. The influence of different carriers, methods of preparation and active component on the adsorption performance were discussed. After optimization, we get the adsorbents of Co/13X, Ce/13X and La/13X. On the basis of the preparation conditions, the adsorption condition was optimized. The optimum conditions are as follows:the temperature of ion exchange is 30 ?, metal exchange concentration is 0.2 mol/L,48 h later the samples will be dried. Under the atmosphere of nitrogen atmosphere, the samples were roasted in 300 ? for 4 h. According to the method, the performance of adsorbents is better. At the same time, much effort had been done to optimize the reaction conditions for static adsorption:when the temperature of the adsorption is 30 ?, agent oil ratio is 0.02 g/g, the performance of adsorbent was better after reacting for 60 min, and the sulfur capacity is 2.810 mg/g.Secondly,13X molecular sieve were modified by two kinds of metal, and then the adsorption performance was researched. We choose the adsorbent of La-Ce/13X molecular sieve as the subject, and the static adsorption sulfur capacity was 6.349 mg/g. And this paper makes a research on the dynamic adsorption conditions and toluene to study the effect on the adsorption performance, the optimal conditions as follows:when the dynamic adsorption temperature is 30 ?, the air speed is 6 h-1,the adsorbent can remove the sulfur to 10 ppm from the concentration of simulated oil is 200 ppm, and keep it about 7 h. The breakthrough capacity is 6.118 mg/g. Under the nitrogen atmosphere condition, the adsorbent can be regenerated at 300 ? for roasting, it can be found that the adsorbent regeneration performance is good and with good stability even after 2 times cyclic regenaration.The adsorbent were characterizated by SEM?BET?ICP?XRD?FT-IR?TG for exploring the influence of pore structure and properties on the adsorption performance. |
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