Effects of residual vanadium on hydrodesulfurization catalysts: Toward efficient catalyst remanufacturing

Efficient hydrodesulfurization catalysts derived from Strandberg P[sbnd]Mo[sbnd]Ni polyoxometalates

The development of a competitive-cost and high-efficiency NiMo/Al2O3 hydrodesulfurization (HDS) catalyst remains challenging in the field of petrochemical industry. Herein, a highly efficient NiMo/Al2O3 monolithic HDS catalyst was elaborately designed and successfully fabricated via a one-pot three-dimensional (3D) printing strategy, and its HDS activity was examined for 4,6-dimethyldibenzothiophene conversion. The results unveil that the NiMo/Al2O3 monolithic catalyst prepared by the 3D printing strategy (3D-NiMo/Al2O3) exhibits hierarchical structure due to the combustion of hydroxymethyl cellulose serving as adhesive, which endows the weaker metal-support-interaction between Mo oxides and Al2O3, remarkably promoting sulfidation of both Mo and Ni species and the formation of "Type II" NiMoS active phase, thereby reducing the apparent activation energy (Ea = 109.2 kJ·mol-1) and increasing the catalytic activity (TOF = 4.0 h-1) and thereafter dramatically boosting the HDS performance of 3D-NiMo/Al2O3 compared with that of NiMo/Al2O3 (Ea = 150.6 kJ·mol-1 and TOF = 2.1 h-1) counterpart synthesized by conventional method with P123 serving as the mesoporous template. Therefore, this study offers a facile and straightforward strategy to fabricate an efficient HDS catalyst with hierarchical structures.

Noble metal silicides catalysts with high stability for hydrodesulfurization of dibenzothiophenes

Light cycle oil (LCO) and waste sunflower cooking oil (WSO) were co‐processed with the aim of obtaining more environmentally friendly fuels. Partial hydrogenation of naphthalene was also investigated as a model reaction. Commercial NiW/SiO2‐Al2O3, as a reference catalyst, and NiW/(pseudoboehmite + SBA‐15), as a new research catalyst, were tested. Liquid products were analyzed by simulated distillation, elemental analysis, and FTIR spectroscopy. Elemental analysis indicated higher efficiency of the research catalyst in hydrodesulfurization, hydrodenitrogenation, and hydrodeoxygenation of pure LCO and mixed feedstock containing WSO. Reactions with pure WSO resulted in less sulfur leaching into the product and a lower degree of deoxygenation compared with the commercial catalyst.

Radioisotopic study of (Co)Mo/Al 2O 3 sulfide catalysts for HDS : Part III. Poisoning by N-containing compounds

Single-pot synthesis of Ti-SBA-15-NiMo hydrodesulfurization catalysts: Role of calcination temperature on dispersion and activity

Boosting ultra-deep hydrodesulfurization of diesel by tuning sulfidation degree of metals on NiMo/AlOOH catalyst

Amino acids assisted hydrothermal synthesis of W-type SrFe18O27 nanostructures; a potential hydrodesulfurization catalyst

The organic–inorganic dual anchoring strategy based on organic chelators and lacunary polyoxometalates for the preparation of efficient CoWS hydrodesulfurization catalysts

Alumina supported HDS catalysts prepared by impregnation with new heteropolycompounds. Comparison with catalysts prepared by conventional Co–Mo–P coimpregnation

Heteropoly acid precursor to a catalyst for dibenzothiophene hydrodesulfurization

Sulfured FeMo carbides and nitrides catalysts upgrade extra heavy crude oil quality

This review paper examines the efficiency of hydro-desulfurization catalysts in removing sulfur compounds from fuels. Specifically, the focus is on bi- and tri-metallic catalysts based on transition metal sulfides (TMS), such as Ni/Co-promoted Mo and W, which effectively eliminate sulfur from challenging compounds present in fuels. The paper is divided into three main sections, each addressing the production of diesel fuel with extremely low sulfur levels using these catalysts. The first section discusses supported catalysts, followed by self-supported or unsupported catalysts, and concludes with a brief overview of theoretical studies. Various factors that can affect the sulfur removal capacity of these catalysts are explored, including the influence of the support material, the use of inorganic and organic additives, and the preparation methods for unsupported catalysts. Based on the review, it is concluded that new experimental and theoretical approaches are necessary to enhance the hydro-desulfurization effectiveness of both supported and unsupported transition metal sulfide catalysts. These advancements are essential to meet the increasingly stringent regulations anticipated for ultra-low sulfur fuels in the future.

Regeneration of an aged hydrodesulfurization catalyst: Conventional thermal vs non-thermal plasma technology

The use of transportation fuels with high sulfur content can lead to the production of a large amount of sulfur oxides, which will have a serious impact on the earth’s ecological environment. Hydrodesulfurization (HDS) technology can effectively remove sulfur-containing compounds from transport fuels to ultra-low sulfur levels. In this paper, the supported cobalt-molybdenum HDS catalysts with honeycomb structure were prepared using activated carbon support derived from cypress wood as raw material. We explored how varying carbonization temperatures influence catalysts’ structural and chemical properties using low-temperature nitrogen adsorption-desorption, The conversion efficiency of these HDS catalysts in transforming thiophene was examined using X-ray difraction(XRD) and scanning electron microscopy (SEM), within a high-pressure micro-fixed-bed reactor setup. Our observations revealed that all catalysts maintained their honeycomb-like structure, featuring both micropores and mesopores. This specialized pore arrangement helps to alleviate the resistance encountered during the mass transfer between large reactant molecules and the resulting products. The larger specific surface area promotes the dispersion of active ingredients in the catalyst, exposing more active sites. The maximum thiophene conversion over the CoMo-800 catalyst reached 93.28%.