Synthesis Of Metal-Organic Frameworks Cu-BTC And Their Properties Of Adsorption Desulfurization

At present, a class called metal-organic frameworks materials (MOFs) of organic-inorganic hybrid has caused attention. Due to its characteristics of large surface area, huge porosity and regular pore structure, MOF materials have a wide range of applications in a variety of liquids and gases adsorption/separation areas.Fuel such as gasoline, diesel fuel is widely used in vehicles, and it occupies a relatively high proportion of the fuel used in the present. The sulfide in oil is one of the major sources of air sulfide pollutants. They endanger seriously to the environment and human health. Meanwhile, SOx will also poisons the heavy metal catalyst in automobile exhaust control device, reduce its efficiency, and even deactivate. Therefore, the removal of these sulfur-containing compounds from oil has become a huge challenge before the use of crude oil.This topic synthesized the adsorbent Cu-BTC by the method of hydrothermal synthesis. By X-ray diffraction (XRD), N2 adsorption-desorption, FT-IR and other analytical techniques, structures of the adsorbent Cu-BTC were characterized. The adsorption experiments used static and dynamic adsorption desulfurization method, respectively to investigate the adsorption time, temperature, ratio of oil to adsorbent, space velocity, and adsorbent loading quantity as single factor influencing the performance of Cu-BTC adsorption desulfurization, and studied the reuse of Cu-BTC adsorption desulfurization. At the same time, the topic researched the adsorption kinetics, adsorption isotherm equation, adsorption thermodynamics parameters, and the adsorption mechanism of metal-organic framework material Cu-BTC which absorbed and removed thiophene in model oil, obtaining the following conclusions:Adopting static adsorption desulfurization experiment, the experimental results showed that the optimum conditions for adsorption desulfurization of adsorbent Cu-BTC:the adsorption temperature30℃, adsorption time120min, the ratio of oil to adsorbent100:1. Under these conditions, the desulfurization rate was84.3%, and the adsorption capacity was32.0mg/g. Further, the use of the adsorbent after5times, had still good desulfurization activity and good reusability. Adopting dynamic adsorption desulfurization experiment, the experimental results showed that when space velocity increased, desulfurization effect became worse, and breakthrough sulfur capacity decreases. Further more, with the reduction of loading amount of the adsorbent, the breakthrough time was shortened, and sulfur breakthrough sulfur capacity decreases.The process of Cu-BTC adsorbing thiophene conformed to the pseudo-second-order kinetic model, and was controlled by the intra particle diffusion and film diffusion. Also, D-R isothermal adsorption model could describe better the process of Cu-BTC adsorbing thiophene.