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首页> 外文期刊>American Chemical Society, Division of Fuel Chemistry, Preprints >Adsorptive Denitrogenation of Liquid Hydrocarbons on Carbon-based Adsorbents for Ultra-Clean Fuels- A study on adsorptive selectivity and mechanism
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Adsorptive Denitrogenation of Liquid Hydrocarbons on Carbon-based Adsorbents for Ultra-Clean Fuels- A study on adsorptive selectivity and mechanism

机译：碳氢化合物吸附剂对液态烃的吸附脱氮作用-吸附选择性及其机理研究

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摘要

Hydrodesulfurization process (HDS) is one of the most important processes in the modern refinery due to the necessity of sulfur reduction resulting from severe environmental regulations. A lot of research worldwide is seeking more efficient way for deep desulfurization. As is known, refractory sulfur compounds in diesel fuel such as 4 and 4,6-dimethyldibenzothiophene are difficult to remove by conventional HDS for its deep desulfurization [1]. Coexisting nitrogen-containing compounds (NCC) makes deep desulfurization even more complicated. Both basic and non-basic nitrogen compounds significantly inhibit the HDS reaction [2] and removal of NCC prior to HDS leads to marked enhancement of attainable sulfur content in gas oil [3]. The reactivity of the NCC is significantly lower than that of the corresponding sulfur compounds. Therefore, when NCC cover the catalyst surface, it stays longer on the catalyst surface due to its slower kinetics of desorption. In addition, basic nitrogen compounds can be adsorbed easily on the acidic sites of the HDS catalyst and thereby poison it. Moreover, the hydrogenation of both basic and non-basic nitrogen compounds during the HDN process produces ammonia as intermediate product which has been confirmed to inhibit deep HDS [2]. As a result, an alternative approach for the removal of NCC prior to HDS is important to be evaluated.
机译：加氢脱硫工艺（HDS）是现代炼油厂中最重要的工艺之一，这是由于严格的环境法规导致必须降低硫含量。全球许多研究都在寻求更有效的深度脱硫方法。众所周知，传统的HDS难以对柴油中的难熔硫化合物（例如4和4，6-二甲基二苯并噻吩）进行深度脱硫[1]。共存的含氮化合物（NCC）使深度脱硫变得更加复杂。碱性和非碱性氮化合物均会显着抑制HDS反应[2]，而在HDS之前去除NCC会导致瓦斯油中可达到的硫含量显着提高[3]。 NCC的反应活性明显低于相应的硫化合物。因此，当NCC覆盖催化剂表面时，由于其较慢的解吸动力学，它在催化剂表面上停留的时间更长。此外，碱性氮化合物很容易吸附在HDS催化剂的酸性位置上，从而使其中毒。而且，在HDN过程中碱性和非碱性氮化合物的加氢都产生氨作为中间产物，这已被证实可以抑制深层HDS [2]。因此，评估HDS之前去除NCC的替代方法很重要。

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