Comparative atomic-scale analysis of promotional effects by late 3d-transition metals in MoS2 hydrotreating catalysts

Atom-resolved scanning tunneling microscopy investigations of molecular adsorption on MoS2 and CoMoS hydrodesulfurization catalysts

“…The STM observations related to the morphologies as a function of synthesis conditions, the role of promoters and substrate effect as well as the atomic-scale structure of MoS 2 and CoMoS were recently reviewed in Ref. [60], while the details of the MoS 2 and CoMoS syntheses can be found in the original papers [54,[61][62][63]. Here we concentrate on the main findings related to the geometric and electronic edge structures that are important for the subsequent discussion of the adsorption studies.…”

Location of Co and Ni promoter atoms in multi-layer MoS2 nanocrystals for hydrotreating catalysis

“…Although the MoS 2 nanoparticles possess hydrotreating activity, it is well known that the addition of small amounts of Co or Ni promotes the catalytic functionality. By Co-or Ni-promotion, the hydrotreating activity is known to increase overall by more than an order of magnitude and the selectivities for the hydrodesulfurization (HDS), hydrodenitrogenation (HDN) and hydrogenation (HYD) reactions are radically modified [1][2][3][4][5][6].…”

First-principles study of transition-metal atoms adsorption on MoS2 monolayer

“…MoS 2 is a typical layered transition metal dichalcogenide material formed by the stacking of weakly interacting 2D S-Mo-S layers like graphite, which behaves the distinct electronic, optical and catalytic properties [2]. Many possible applications have been investigated, such as lubricants [3], catalysis [4], transistors [5], photoemitting devices [6], hydrogen storage and Li-ion batteries etc [7,8]. Recently, 2D MoS 2 monolayer has been fabricated by different methods, such as mechanically exfoliation [9], chemical exfoliation [10], hydrothermal synthesis and chemical vapor deposition [11,12].…”