Maya crude oil hydrotreating reaction in a batch reactor using alumina-supported NiMo carbide and nitride as catalysts

Pollutant reduction and catalytic upgrading of a Venezuelan extra-heavy crude oil with Al2O3-supported NiW catalysts: Effect of carburization, nitridation and sulfurization

“…1A) did not reveal any bimetallic oxides formation, e.g. NiWO 4 (PDF card number 72-0480) [43], likely due to the high dispersion of the metals in the γ-Al 2 O 3 matrix or it could be due to the small size of crystals making them undetectable for this technique, as reported earlier for analogous catalysts [23,24,41,45,46]. On contrary, the diffraction signals for the bimetallic NiW carbides catalysts (Fig.…”

“…Tungsten impregnation was carried out first and then nickel impregnation. The solutions were prepared using appropriate amounts of the precursor salts to obtain Ni/(Ni + W) atomic ratios varying from 0.00 to 1.00, and a total of metal oxide loading of 15 wt% on Al 2 O 3 , in accordance to our previous reports [41]. Thermal calcination treatments at specific temperatures were applied with the aim of obtaining the desired metal oxide phases.…”

Preparation of Ni-Mo 2 C/carbon catalysts and their stability in the HDS of dibenzothiophene

“…Novel catalysts, such as metal carbides and nitrides, have also been investigated as potential hydrotreating catalysts over the past several decades [4][5][6], in part because of their noble metal-like catalytic properties [7][8][9][10]. Sajkowski and Oyama [11] reported that a Mo2C/Al2O3 catalyst had twice the HDS activity of a conventional MoS2 catalyst when measured at 633 K and 13.0 MPa H2 using a gas oil with 116 ppm S. The comparison was made based on the number of active sites as measured by CO uptake.…”

Study of Chemical and Morphological Transformations during Ni2Mo3N Synthesis via an Oxide Precursor Nitration Route

“…Recently it was shown by our group that Ni-Mo nitride could be used as a catalyst for CO x -free hydrogen production via ammonia decomposition for low-temperature hydrogen fuel cell applications [2]. Ni 2 Mo 3 N nitride can be synthesized through different routes, including the ammonolysis of oxide precursors [3], the decomposition of complex organometallic salts in inert atmosphere [4], the reduction of nitrogen-containing inorganic salts in hydrogen [5], and the nitration of metastable precursors [6]. Recently, new a method for the synthesis of Ni 2 Mo 3 N phase using citric acid as a chelating agent was developed by Zaman et al [7].…”