This study aims at determining the optimal CO2 separation technology for Chinese refineries, based on current available technologies, by the method of comprehensive evaluation. Firstly, according to the characteristic...This study aims at determining the optimal CO2 separation technology for Chinese refineries, based on current available technologies, by the method of comprehensive evaluation. Firstly, according to the characteristics of flue gas from Chinese refineries, three feasible CO2 separation technologies are selected. These are pressure swing adsorption （PSA）, chemical absorption （CA）, and membrane absorption （MA）. Secondly, an economic assessment of these three techniques is carried out in accordance with cash flow analysis. The results show that these three techniques all have economic feasibility and the PSA technique is the best. Finally, to further optimize the three techniques, a two-level fuzzy comprehensive evaluation model is established, including economic, technological, and environmental factors. Considering all the factors, PSA is optimal for Chinese refineries, followed by CA and MA. Therefore, to reduce Chinese refineries carbon emission, it is suggested that CO2 should be captured from off-gases using PSA.展开更多
An alumina support was modified by fluorine via impregnation to investigate the effect of fluoride content on the reactivity of Ni–Mo/Al2O3 catalyst.The catalyst was characterized by X-ray diffraction,N2 adsorption–...An alumina support was modified by fluorine via impregnation to investigate the effect of fluoride content on the reactivity of Ni–Mo/Al2O3 catalyst.The catalyst was characterized by X-ray diffraction,N2 adsorption–desorption(Brunauer–Emmett–Teller)isotherms,temperature-programmed desorption of ammonia,X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy.Sulfur etherification performance of the catalyst was studied using a fixed-bed reactor.The results show that increasing fluoride content increases the pore volume and pore size but reduces the specific surface area.In addition,the degree of sulfidation of Ni first increases and then decreases.The amounts of strong acid and total acid also increase with increasing fluoride content.Performance evaluation of the catalyst reveals that the fluoride content has a minor effect on the thioetherification performance of the catalyst;however,an optimum fluoride content,which was determined to be 0.2%,can ensure lower olefin saturation and an efficient diene selective hydrogenation.展开更多
基金the China University of Petroleum Foundationthe Research Institute of Safety and Environment TechnologyChina National Petroleum Corporation
文摘This study aims at determining the optimal CO2 separation technology for Chinese refineries, based on current available technologies, by the method of comprehensive evaluation. Firstly, according to the characteristics of flue gas from Chinese refineries, three feasible CO2 separation technologies are selected. These are pressure swing adsorption （PSA）, chemical absorption （CA）, and membrane absorption （MA）. Secondly, an economic assessment of these three techniques is carried out in accordance with cash flow analysis. The results show that these three techniques all have economic feasibility and the PSA technique is the best. Finally, to further optimize the three techniques, a two-level fuzzy comprehensive evaluation model is established, including economic, technological, and environmental factors. Considering all the factors, PSA is optimal for Chinese refineries, followed by CA and MA. Therefore, to reduce Chinese refineries carbon emission, it is suggested that CO2 should be captured from off-gases using PSA.
基金This work has been supported by the National Natural Science Foundation of China(Grant No.21776303).
文摘An alumina support was modified by fluorine via impregnation to investigate the effect of fluoride content on the reactivity of Ni–Mo/Al2O3 catalyst.The catalyst was characterized by X-ray diffraction,N2 adsorption–desorption(Brunauer–Emmett–Teller)isotherms,temperature-programmed desorption of ammonia,X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy.Sulfur etherification performance of the catalyst was studied using a fixed-bed reactor.The results show that increasing fluoride content increases the pore volume and pore size but reduces the specific surface area.In addition,the degree of sulfidation of Ni first increases and then decreases.The amounts of strong acid and total acid also increase with increasing fluoride content.Performance evaluation of the catalyst reveals that the fluoride content has a minor effect on the thioetherification performance of the catalyst;however,an optimum fluoride content,which was determined to be 0.2%,can ensure lower olefin saturation and an efficient diene selective hydrogenation.
