Core-shell catalysts with CoMoS phase embedded in clay nanotubes for dibenzothiophene hydrodesulfurization

Nanoarchitectural strategy for design of highly active catalysts with CoMoS encased in 50-nm diameter aluminosilicate tubes (halloysite nanoclay) serving as an abundantly available natural support was proposed. This encapsulation conception implies the protection of active metal sulfides from aggregation, coking and leaching. Synthesized nanocatalytic system was investigated by TEM, XPS, N2 adsorption, hydrogen temperature programmed reduction and desorption of ammonia techniques. Using of Mo-heteropolyacid anionic precursor complex (ca. 10 wt%) possess selective loading of molybdenum oxide into 15-nm diameter inner cavity of the nanotubes (covered with positively charged alumina) by an electrostatic attraction. Subsequent sulfidation results in formation of CoMoS particulate core inside the aluminosilicate shell. These tubular nanoreactors were pelletized using alumina binder to produce a mechanically strong mesoporous catalyst efficient for hydro treatment of diesel petroleum fraction to clean fuels.

Automated summary

A nanoarchitectural strategy for designing highly active catalysts using CoMoS encased in 50-nm diameter aluminosilicate tubes as a natural support has been proposed. This encapsulation approach protects the active metal sulfides from aggregation, coking, and leaching. Experimental results indicate that the selective loading of molybdenum oxide inside the nanotubes using Mo-heteropolyacid anionic precursor complex leads to the formation of CoMoS particulate core inside the aluminosilicate shell, resulting in a mechanically strong mesoporous catalyst efficient for the hydro treatment of diesel petroleum fraction to clean fuels.