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Novel Molybdenite-Based Nanopowder Catalysts for Hydrodesulfurization
Petroleum Chemistry ( IF 1.4 ) Pub Date : 2021-07-07 , DOI: 10.1134/s0965544121070033
T. A. Fedushchak 1 , A. S. Akimov 1 , A. V. Vosmerikov 1 , L. M. Velichkina 1 , A. A. Stepanov 1 , M. A. Uimin 2 , V. V. Maikov 2 , S. P. Zhuravkov 3 , I. P. Prosvirin 4 , V. M. Kogan 5
Affiliation  

Abstract

Novel bulk single-component sulfide catalysts were prepared under the conditions of solid-phase dispersion of МoS2 molybdenite at various mechanical treatment times and various amounts of polar and nonpolar liquid microadditives. The chemical degradation of the samples in the air was found to lead to the formation of surface sulfate anions that shield catalytically active Mo sites. Indirect correlations of the hydrodesulfurization ability of MoS2 powders with the concentration of sulfate anions on their surface, and with the aqueous pH in the powder suspensions, including the dielectric permittivity of the organic dopants, can serve as reference indicators of high catalytic activity in the model reaction of dibenzothiophene hydrogenolysis. The study identified the most active sample able to run for an extended time during multiple cycles without losing its catalytic properties. Also, the paper discusses the dibenzothiophene conversion routes, the product composition, the probable structure of active sites in the catalysts, and the desulfurization degree of diesel fuel components.



中文翻译:

用于加氢脱硫的新型辉钼矿纳米粉催化剂

摘要

在不同机械处理时间和不同数量的极性和非极性液体微添加剂的 МoS 2辉钼矿固相分散的条件下,制备了新型本体单组分硫化物催化剂。发现样品在空气中的化学降解导致表面硫酸根阴离子的形成,这些阴离子屏蔽了催化活性的 Mo 位点。MoS 2加氢脱硫能力的间接相关性在二苯并噻吩氢解模型反应中,具有硫酸根阴离子浓度的粉末和粉末悬浮液中的水相 pH 值,包括有机掺杂剂的介电常数,可以作为高催化活性的参考指标。该研究确定了最活跃的样品,能够在多个循环中长时间运行而不会失去其催化性能。此外,本文还讨论了二苯并噻吩的转化路线、产物组成、催化剂活性位点的可能结构以及柴油燃料组分的脱硫程度。

更新日期:2021-07-07
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