Study of Desulfurization Adsorbent of Gasoline
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A new desulfurization adsorbent,silicone modified with multi-metals at the present of inorganic latent solvent is developed.The adsorbent is applied for adsorption desulfurization of gasoline by using the static adsorption of model compounds and straight gasoline at room temperature.The results indicate that the transition metal-based adsorbent developed in this work is effective for selectively adsorbing the sulfur compounds.The process can effectively remove thioalcohol,thioether and thiophene sulfur compounds in the liquid hydrocarbon fuels at room temperature under atmospheric pressure with low investment and operating cost.Cite
Taking the activated carbon that was modified under 250℃ by concentrated sulfuric acid as support,a gasoline activated carbon-based desulfurization adsorbent MnO2/AC with MnO2 as active component was firstly prepared by impregnation.The effect of preparation and desulfurization condition on the desulfurization efficiency was investigated.The research results show that Mn(NO3)2 as the precursor,Mn(NO3)2 impregnation concentration of 0.15mol/L,the impregnation time of 24h under room temperature,the roasting temperature of 350℃ and the roasting time of 2h are the suitable adsorbent preparation conditions.The sulfur content of material gasoline can be reduced from 628.6×10-6 to 221.5×10-6,which has the desulfurization efficiency up to 64.8% at the static adsorption temperature of 120℃,the adsorption time of 2h and the mass ratio of adsorbent to gasoline of 0.10;while the sulfur content in initial gasoline effluent after adsorption can be decreased from 628.6×10-6 to 21.8×10-6 and the initial desulfurization efficiency is 96.5% at the dynamic adsorption temperature of 60℃ and the LHSV of material gasoline of 1.76h-1.
Roasting
Carbon fibers
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Reactive adsorption desulfurization over metal oxides adsorbents was carried out to remove the sulfur of real fluid catalytic cracking gasoline and model gasoline in a batch reactor at low pressures in the presence of hydrogen. The results show that Ni appearing after reduction and higher temperature leads to a significant improvement in the desulfurization ability of the adsorbents. When the initial concentration of thiophene in the model gasoline raised the sulfur, removal rate decreased while the adsorption capacity of the adsorbents increased and the maximum sulfur removal rate and sulfur adsorption capacity were 86.33% and 13.72 mg/g, respectively.
Fluid catalytic cracking
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Adsorptive desulfurization of model gasoline fuels and a real gasoline over a nickel-based adsorbent Ni−Al was conducted in a flowing adsorption system at a temperature range of 25−200 °C under ambient pressure without using H2 gas in order to evaluate the desulfurization performance of the adsorbent for producing ultra-low-sulfur gasoline for fuel cell applications. Adsorptive capacity and selectivity of the Ni−Al adsorbent for various sulfur compounds and the effects of coexisting olefin in gasoline as well as adsorptive conditions on the adsorptive performance were examined. It was found that the nickel-based adsorbent shows high capacity and selectivity for the adsorptive desulfurization of gasoline. Olefins in gasoline have a strong inhibiting effect on the desulfurization performance of the nickel-based adsorbent at room temperature. Increasing the temperature to 200 °C can significantly improve the desulfurization performance of the nickel-based adsorbent for real gasoline. The adsorption mechanism and selectivity are discussed on the basis of the experimental results and computational analysis. The adsorption of sulfur compounds on the nickel surface involves C−S bond cleavage, as evidenced by the formation of ethylbenzene from benzothiophene in the absence of H2 gas in the flow adsorption system.
Benzothiophene
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Adsorption desulfurization techniques can be used to remove sulfur compounds from fuel oil economically and effectively.In this paper,the recent progress of adsorption desulfurization of gasoline using adsorbents based on activated carbon,molecular sieve,metal oxide and clay materials was reviewed.
Fuel oil
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