A pair
of mesoporous and hierarchical macro/mesoporous alumina-supported
catalysts having distinct textural parameters have been chosen to
elucidate the effect of texture on activity in hydrodesulfurization
(HDS) and hydrodemetallization (HDM) of heavy tatar oil possessing
extremely high viscosity and sulfur content. For monitoring catalyst
properties, the samples have been investigated by XRD, XFS, XPS, EXAFS,
SEM, TEM, FTIR, TPD-NH3, mercury porosimetry, and N2 adsorption methods. Among different factors such as support
acidity, active component dispersion, and texture, the last one has
been found to play the most significant role in this process. The
hierarchical macro/mesoporous catalyst shows lower coking rate of
the hydrotreated products, as well as higher HDS and HDM conversions
despite its lower active component dispersion and decreased support
acidity.
A set of novel CoMoNi hydrotreating catalysts supported on sepiolite-like mineral and modified by H 3 PO 4 have been prepared and studied in hydrodesulfurization (HDS) and hydrodemetallization (HDM) of heavy Tatar oil with extremely high viscosity and sulfur content. Catalysts had a multiphase composition, represented by calcium/magnesium oxides, silicates, or phosphates, and were found to be of great interest for studying the role of support surface properties in heavy oil hydrotreating. For monitoring the catalyst properties, all the samples have been investigated by X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XFS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), CO-and CDCl 3 -Fourier transform infrared (FTIR), mercury porosimetry, and N 2 adsorption methods. The catalyst with a small phosphate content showed higher initial HDS conversion due to the more developed specific surface area, increased Lewis acidity, and better active component distribution; however, the sulfur removal substantially reduced during 240 h on stream. The sample with a high amount of phosphates demonstrated better stability, higher HDM, and hydrocracking/ hydroisomerization activity despite lower acidity and poor active phase dispersion that may be accounted for by the higher fraction of macropores.
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