Adsorptive desulfurization of gasoline over nickel-based adsorbent for fuel cell applications
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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.
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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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Compared with conventional hydrodesulfurization (HDS) technologies, adsorptive desulfurization for ultra-clean oil production shows their advantages and hase been developing rapidly in recent years. Latest researches in adsorptive desulfurization of organic sulfur in fuel oils were reviewed, especially reactive adsorption desulfurization and selective adsorptive desuffurization and application of molecular sieve, metal oxides, activated carbon and clay based sorbents. It was pointed out that selective adsorption might be the most promising desulfurization route for attaining zero sulfur content in fuel oils in the near future.
Fuel oil
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