Abstract
Hydrodesulphurization (HDS) catalysts were newly prepared by water-assisted spreading of CoCO3.Co(OH)2 of low solubility in water onto pre-sulphided Mo species supported on several Al2O3 of surface area SBET 77-262 m2g−1, ZrO2 of SBET 108 m2g−1, and TiO2 of SBET 140 m2g−1. The spreading was followed by scanning electron microscopy (SEM-EDX). X-ray photoelectron spectroscopy (XPS) and temperature programmed reduction (H2-TPR) characterized partial re-oxidation of sulphidic Mo catalysts before Co sorption. The prepared catalysts were characterized in sulphidic form by H2-TPR. Activity of catalysts was determined in the HDS reaction of 1-benzothiophene. The spreading of Co onto sulphidic catalysts led to systematic increase of HDS activity by 16–86% in comparison to the spreading of Co onto oxide samples.
Highlights
Sulphidic CoMo/Al2 O3 catalysts represent typical heterogeneous catalysts developed for industrial hydrodesulphurization (HDS) reactions over the past 70 years [1]
Point of zero charge (PZC) of pre-sulphided Mo catalysts is mutually interrelated with the phenomenon of partial re-oxidation of sulphidic surface, which appeared crucial to carry on water-assistant spreading (WASsulph )
The feasibility of the water-assisted spreading of the low solubility CoCO3 .Co(OH)2 onto pre-sulphided Mo species was reported
Summary
Sulphidic CoMo/Al2 O3 catalysts represent typical heterogeneous catalysts developed for industrial hydrodesulphurization (HDS) reactions over the past 70 years [1]. Due to their key role in sustainable crude-oil processing, their structure, function, or synthesis are thoroughly investigated. Novel preparation methods are introduced in the literature both to provide fundamental understanding of promotion and to gain pronounced activity in HDS. One direction of this endeavor represents the examination of chelating agents for deposition of the CoMo phase [2,3,4]. Another direction of advanced syntheses is represented by direct deposition of Co onto sulphide Mo surface instead of promoting oxidic Mo surface [5,6,7,8,9,10,11,12]
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