Ni2P Catalysts Supported on Titania-Modified Alumina for the Hydrodesulfurization of Dibenzothiophene

Enhanced selectivity of the CO2 reverse water-gas reaction over a Ni2P/CeO2 catalyst

Ni catalysts tend to easily undergo methanation and metal sintering at high temperatures during the CO₂ hydrogenation reaction. Herein, Ni₂P, a typical kind of transition metal phosphide, had been demonstrated to be efficient for use in the reverse water gas (RWGS) reaction. Under weight hourly space velocity (WHSV) values of 150 000 and 300 000 mL g^-1 h^-1, the Ni₂P/CeO₂ catalyst presented a high CO selectivity, better than that of the conventional Ni/CeO₂ catalyst. The activity was also well maintained in a 20 h stability test. Detailed physicochemical characterization proved that the moderate adsorption strength of CO₂, as well as more strong adsorption active sites for H₂ on the Ni₂P/CeO₂ surface, prevented the CO₂ from further hydrogenating to CH₄, which accounted for the remarkable CO selectivity and stability of the CO₂ RWGS reaction.

The synthesis and mechanistic studies of a highly active nickel phosphide catalyst for naphthalene hydrodearomatization

Ni_xP–Al-M catalysts were synthesized with different Ni/P molar ratios and loadings, which displayed high HDA activity and decalin selectivity.

Comparison of four different synthetic routes of Ni2P/TiO2–Al2O3 catalysts for hydrodesulfurization of dibenzothiophene

A highly active Ni₂P/TiO₂–Al₂O₃ catalyst was simply synthesized at a much lower temperature (573 K) than previously reported methods (973 K).

Magnetic composites based on metallic nickel and molybdenum carbide: a potential material for pollutants removal

New magnetic composites based on metallic nickel and molybdenum carbide, Ni/Mo(2)C, have been produced via catalytic chemical vapor deposition from ethanol. Scanning electron microscopy, thermal analysis, Raman spectroscopy and X-ray diffraction studies suggest that the CVD process occurs in a single step. This process involves the reduction of NiMo oxides at different temperatures (700, 800 and 900°C) with catalytic deposition of carbon from ethanol producing molybdenum carbide on Ni surface. In the absence of molybdenum the formation of Ni/C was observed. The magnetic molybdenum carbide was successfully used as pollutants removal by adsorption of sulfur and nitrogen compounds from liquid fuels and model dyes such as methylene blue and indigo carmine. The dibenzothiofene adsorption process over Ni/Mo(2)C reached approximately 20 mg g(-1), notably higher than other materials described in the literature and also removed almost all methylene blue dye. The great advantage of these carbide composites is that they may be easily recovered magnetically and reused.