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In Situ Thermal-Stage Fitted-STEM Characterization of Spherical-Shaped Co/MoS$_{2}$ Nanoparticles for Conversion of Heavy Crude Oils

Ramos, Manuel; Galindo-Hernández, Félix; Torres, Brenda; Domínguez-Esquivel, José Manuel; Heilmaier, Martin

We report the thermal stability of spherically shaped cobalt-promoted molybdenum disulfide (Co/MoS$_{2}$) nano-catalysts from in-situ heating under electron irradiation in the scanning transmission electron microscope (STEM) from room temperature to 550 °C ± 50 °C with aid of Fusion® holder (Protochip©, Inc.). The catalytic nanoparticles were synthesized via a hydrothermal method using sodium molybdate (Na$_{2}$MoO$_{4}$·2H$_{2}$O) with thioacetamide (CH$_{3}$CSNH$_{2}$) and cobalt chloride (CoCl$_{2}$) as promoter agent. The results indicate that the layered molybdenum disulfide structure with interplanar distance of ~0.62 nm remains stable even at temperatures of 550 °C, as observed in STEM mode. Subsequently, the samples were subjected to catalytic tests in a Robinson Mahoney Reactor using 30 g of Heavy Crude Oil (AGT-72) from the golden lane (Mexico’s east coast) at 50 atm using (ultrahigh purity) UHP hydrogen under 1000 rpm stirring at 350 °C for 8 h. It was found that there is no damage on the laminar stacking of Co/MoS2 with temperature, with interlayer spacing remaining at 0.62 nm; these sulfided catalytic materials led to aromatics rise of 22.65% and diminution of asphaltenes and resins by 15.87 and 3.53%, respectively.

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Verlagsausgabe §
DOI: 10.5445/IR/1000129898
Veröffentlicht am 19.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2073-4344
KITopen-ID: 1000129898
Erschienen in Catalysts
Verlag MDPI
Band 10
Heft 11
Seiten Art.-Nr.: 1239
Vorab online veröffentlicht am 27.10.2020
Schlagwörter catalyst; materials; thermal; oil; molybdenum; cobalt; sulfur
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