Preparation and hydrodesulfurization properties of cobalt–molybdenum–phosphorous catalysts for removal of dibenzothiophene

Abstract

In this study, a series of cobalt-molybdenumphosphorous acid (Co-Mo-P) impregnating solutions with various Co/Mo molar ratios (0.2, 0.25, 0.3, 0.35) were synthesized, and desulfurization catalysts were prepared by mixing the solutions with c-Al 2 O 3 through an incipientwetness impregnation method. The Co-Mo-P supported cAl 2 O 3 catalysts were tested in the hydrodesulfurization of dibenzothiophene (DBT). The catalysts were characterized by N 2 adsorption-desorption isotherms, XRD, py-FT-IR, and HRTEM. Nitrogen adsorption measurements revealed that the as-prepared catalysts possess high specific surface area and appropriate pore size. XRD showed that Co species and Mo species were well dispersed on the surface of c-Al 2 O 3 with the addition of phosphoric acid. Py-FT-IR showed that the catalyst with a Co/Mo molar ratio of 0.25 exhibited more Lewis and Brønsted acid sites. The stacking number and slab length of MoS 2 nanoclusters changed with various Co/Mo molar ratios as revealed by HRTEM. Among the tested catalysts, Co-Mo-P supported c-Al 2 O 3 with Co/Mo molar ratio of 0.25 exhibited higher activity and selectivity of biphenyl than the other catalysts.

Facile fabrication, characterization and catalytic activity of a NiMo/Al2O3 nanocatalyst via a solution combustion method used in a low temperature hydrodesulfurization process: the effect of fuel to oxidant ratio

“…17,18 In order to obtain superior hydrodesulfurization performance, modied catalyst should be utilized, which could be achieved by the employment of novel preparation methods or incorporation of suitable promotors. Positive effects of various promotors such as zirconia, 18 titania, 19 uorine, 20 boron 21 and phosphorus 22 have been reported by numerous studies. It is also well established that the addition of chelating ligands in the catalyst preparation is a benecial way to improve catalytic performance in the HDS process.…”

Adsorption-catalytic method for reducing the content of sulphur compounds in gas condensate diesel fuel

“…However, DFs obtained from gas condensates often do not meet modern standards not only in terms of the cetane number (CN), but also in terms of the content of sulfur compounds (SC). Traditionally, the reduction of the SC content in DFs in industry is carried out using hydrotreating processes [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Utilization of amino acid for selective leaching of critical metals from spent hydrodesulfurization catalyst

“…The demand for low-sulfur fuels is increasing due to the implementation of stricter environmental regulations in the last decade worldwide. Nonetheless, the processing of heavier crude oil with higher sulfur, nitrogen and metal contents is growing, necessitating the increased use of hydrodesulfurization catalysts in petroleum refineries ( Marafi and Stanislaus, 2007 ; Akcil et al, 2015 ; Li et al, 2015 ). Hydrodesulfurization catalysts generally consist of the MoS 2 active phase with Co or Ni promoters supported on γ-Al 2 O 3 ( Ihan, 2020 ).…”