Effect of phosphorus on activity of hydrotreating catalyst of Maya heavy crude

Hydrodesulfurization and hydrocracking of Maya crude with P-modified NiMo/Al2O3 catalysts

“…It has been found that the effects induced by P depend in many cases of the method in which P is incorporated to the catalyst. For example, differences in activity have been found depending if P is incorporated before or after the metal active phases [8,9,11].…”

“…In the literature there are a large number of studies on the effect of P on NiMo/Al 2 O 3 catalysts using sulfur containing model molecules (thiophene, benzothiophene, 4.6 dimethyl dibenzothiophene, etc.) [1][2][3][4][5][6][7][8][9][10][11][12][13]. These studies have shown that phosphorus has different effects, such as: (a) Improves the stability of impregnating solutions helping the dispersion of the metals on the support [3][4][5][6].…”

“…(d) Improves the thermal stability of -alumina [7]. (e) Inhibits coke formation during hydrotreating reactions [8,9]. (f) Increases hydrocracking activity [10].…”

Effect of acidity, hydrogenating phases and texture properties of catalysts on the evolution of asphaltenes structures during reside hydroconversion

“…First CoMo(P) and NiMo(P) were investigated supported on mixed TiO 2 or SiO 2 alumina support [26,27,38]. They were prepared by coprecipitation of salts by urea hydrolysis method which did not allow to carefully monitoring the support porous distribution.…”

Synthesis, characterization and catalytic properties of NiMoP/MCM41-γAl2O3 catalysts for DBT hydrodesulfurization

“…These anions decompose into molybdate and phosphate during the calcinations of the catalysts. Phosphate ions interact strongly with the support, preferably with sites having micropores [30].…”