Synthesis and characterization of molybdenum nitride hydrodenitrogenation catalysts

Abstract

Details concernithe relationships between the structural, chemical and catalytic properties o MO nitrides have been elucidated. A series of MO nitride n! catalysts were prepared by the temperature programmed reaction of MoOa with NH3. The structural properties of these nitrides were complex functions

Simultaneous hydrodesulfurization of thiophene and hydrogenation of cyclohexene over dimolybdenum nitride catalysts

“…This fact can be taken as an evidence that the HDS and HYD over g-Mo 2 N are structure-sensitive. Some authors have reported that pyridine hydrodenitrogenation reaction over Mo nitrides is structure-sensitive, and at least two types of hydrodenitrogenation sites were proposed on the surface area of catalyst [7]. Meanwhile, it is well known that a semi-quantitative measurement of preferential orientation is the ratio between the intensities of diffraction peaks of (1 1 1) and (2 0 0) planes in the XRD patterns [1,14,24].…”

Ammonia decomposition over titanium carbides

“…Eight titanium carbides was synthesized via TPR (temperature-programmed reduction) of titanium oxide (TiO 2 ) with pure CH 4 . The prepared crystallites contained the different surface areas, indicating that the structural properties of these carbide materials were strong functions of two different heating rates and space velocity employed in the current study.…”

“…In this paper we prepared eight different titanium carbides by using the temperature-programmed reaction of titanium oxide precursor (TiO 2 ) with CH 4 . The sorptive properties of these materials were obtained using BET total surface area measurements and oxygen chemisorption.…”

“…CO hydrogenation [2], hydrodenitrogenation [3,4] and NH 3 synthesis [5]. Moreover, it is known that transition metal carbide crystallites such as tungsten and molybdenum carbides crystallites, exhibited activity resemblances of platinumbased crystallites for dehydrogenation, hydrogenolysis and isomerization reactions [6][7][8].…”

Research experience for undergraduates

“…The ability of catalysts to remove these heteroatoms is enhanced when the transition metal carbide or nitride is present as a nanoscale surface over layer on a metal substrate [11]. Nanocrystallites of molybdenum nitride and carbide have been shown to have catalytic activity for HDN and HDS equal to or greater than that of commercial sulfided molybdenum catalysts [13][14][15][16]. Commercially available ultra fine platinum powder has also been used to demonstrate that a porous aggregate of nanoscaled molybdenum carbide particles produced by sonochemical methods has enhanced catalytic activity for dehydrogenation of cyclohexane [17].…”