20 Result(s)

Article

Magnetic Defects in Transitional Metal Di-Chalcogenide Semiconducting Layers

In this work, we report on the electron spin resonance (ESR) studies performed on few-layered nanocrystalline (NCs) MoS₂, WS₂, and TiS₂ prepared using hydrothermal and vapor transport methods. From the temperatur...

L. M. Martinez, M. D. Teran, R. R. Chianelli, S. R. J. Hennadige… in MRS Advances (2018)

Article

Structural Aspects of Ternary Phase Ni/MoWS₂ Catalyst: An Aberration Corrected HRTEM Study

In the past 20 years, one of the best catalytic materials for hydrodesulphurization reactions of crude oil has been the transition sulfides, MoS₂, known also as the “workhorse” of the refinery industry. It has be...

M. Ramos, B. Torres, Daniel Bahena, M. José-Yacamán… in MRS Online Proceedings Library (2013)

Article

A DFT and HRTEM Study on MoS₂/Co: Locating Promoters in Catalytic Nanostructures

Locating cobalt promoters on catalytically MoS₂ structures is a challenging task to achieve; this is due to the size on those MoS₂ nanostructures. Previous reports in the literature indicate that specific locatio...

Manuel Ramos, Gilles Berhault, Jose Rurik Farias… in MRS Online Proceedings Library (2011)

Article

Synthesis and Characterization of Hexamethylenediammonium Thiometallates as Precursors of MoS₂ and WS₂ Catalysts: In situ Activation During HDS of DBT

Hexamethylenediammonium thiometallate (HeDaT) of molybdenum and tungsten were synthesized using the aqueous solution method. This method improved significantly the yield of the catalysts. The HeDaT precursors wer...

G. Alonso-Núñez, R. Huirache-Acuña, F. Paraguay-Delgado… in Catalysis Letters (2009)

Article

Silica Gel-Supported, Metal-Promoted MoS₂ Catalysts for HDS Reactions

Silica-supported, metal-promoted MoS₂ catalysts were prepared. Sol–gel method was used for providing the SiO₂ support as well as for including the catalyst precursors and promoter in one single step of preparatio...

E. Rivera-Muñoz, G. Alonso, M.H. Siadati, R.R. Chianelli in Catalysis Letters (2004)

Article

Silica Gel- and MCM-41-Supported MoS₂ Catalysts for HDS Reactions

MCM-41- and silica gel-supported MoS₂ catalysts were prepared. MCM-41 was synthesized and impregnated with precursor, then activated to obtain the active phase. The sol–gel method was used for providing the SiO₂ ...

E. Rivera-Muñoz, D. Lardizabal, G. Alonso, A. Aguilar, M.H. Siadati… in Catalysis Letters (2003)

Article

Dehydrogenative oligomerization reactivity of transition metal sulfides derived from their tris or bis(o-aminobenzenethiolato)metal complexes

Several tris or bis(o-aminobenzenethiolato)metal complexes, where metals include ruthenium, rhodium, rhenium, molybdenum, platinum, and palladium, were synthesized. They were used as precursors to active metal su...

Long Y. Chiang, C. L. Coyle, R. R. Chianelli in Catalysis Letters (1991)

Chapter

Theoretical Studies of Transition Metal Sulfide Hydrodesulfurization Catalysts

Hydroprocessing catalysts based on the transition metal sulfides (TMS) have been used widely for over 60 years, and catalysts such as Co/Mo/Al₂O₃ remain the industry “workhorses” in hydroprocessing of petroleum-b...

Suzanne Harris, R. R. Chianelli in Theoretical Aspects of Heterogeneous Catalysis (1990)

Article

Preparation and Characterization of Molybdenum Disulfide Microcrystals in Colloidal Dispersion

We report the preparation and general, optical and resonant Raman scattering characterization of MoS₂ platelets suspended in an insulating organic liquid. Structural results indicate that the platelets are predom...

E. Lu, P. D. Persans, A. F. Ruppert, R. R. Chianelli in MRS Online Proceedings Library (1989)

Article

Linus Pauling Addresses MRS in San Diego

R. R. Chianelli in MRS Bulletin (1989)

Article

Soluble catalyst precursors for dehydrogenative polymerization reaction

Two soluble catalyst precursors, Re(abt)₃ and Re(abt)₂(C₆H₄NS) can be used to generate rhenium Sulfides insitu, which catalyze polyquinoline synthesis by dehydrogenative polymerization reactions. The reactive rhe...

Long Y. Chiang, J. W. Swirczewski, R. R. Chianelli, E. I. Stiefel in Catalysis Letters (1988)

Article

Surface Disorder and Exfoliation in Lithographically Textured Molybdenum Disulfide

Lithographic techniques have been used to prepare transmission electron microscopy samples of MoS₂, allowing examination of the edge surface with single-layer resolution. We observe that these surfaces are easily...

C. B. Roxlo, H. W. Deckman, J. H. Dunsmuir, A. F. Ruppert… in MRS Online Proceedings Library (1986)

Chapter

Catalysis by Transition Metal Sulfides

As supplies of clean petroleum feedstocks dwindle, industry will be called upon to process and upgrade “dirtier” feedstocks. Feedstocks of this type contain large amounts of sulfur and nitrogen which must be r...

R. R. Chianelli in Surface Properties and Catalysis by Non-Metals (1983)

Chapter

Diffusion in the Intercalation Compounds of the Layered Disulfides

In intercalation compounds of the layered transition metal disulfides, atomic and molecular guest species are incorporated between the layers of the host sulfide lattice by a topochemical reaction with only mi...

R. R. Chianelli, B. G. Silbernagel, M. S. Whittingham in Superionic Conductors (1976)