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

Architectural design of core–shell nanotube systems based on aluminosilicate clay

“…This strategy is based on electrostatic interaction between anionic PMo 12 O 40 3− species and the positively charged halloysite inner cavity, which drives Co and Mo ions to the lumen followed by high-temperature sulfidation. 35 Sulfide particles of ca. 4.2 nm in length with an average stacking number of 1.6 were reported.…”

“…34 suldation. 35 Sulde particles of ca. 4.2 nm in length with an average stacking number of 1.6 were reported.…”

“…This may be extended by tuning halloysite acidity with etching, which helps to improve the acid-catalyzed C-S bond scission and C-C isomerization. 35,58 We conrmed retaining the nanotubular structure aer extrusion with a boehmite binder and for composites with silica followed by its calcination. 36 Halloysite is an aluminosilicate clay available in thousands of tons at a low price, and it may be used as a silica and alumina source for industrial zeolites with a desirable porous framework, textural properties, and acidity.…”

A gram-scale fabrication of core–shell copper nanoparticles for efficient hydrogenation of nitroarenes

“…[11][12][13] Considering the above-mentioned studies, non-noble metals have attracted increasing attention from scientists, and supported Fe-, Co-, Ni-, and Cu-based catalysts have led to the excellent hydrogenation of nitroarenes using hydrazine hydrate as the hydrogen source. [14][15][16][17] Unfortunately, the reduction process shows poor conversion when the hydrogen source changes to molecular hydrogen, which is regarded as the most efficient route; nevertheless, most of the catalytic processes face a lot of difficulties such as low conversion, selectivity, and harsh reaction conditions, par-ticularly in the presence of alternative reducible groups or halo-substituent groups. Hence, how to improve both the activity and selectivity of the catalysts using gaseous H 2 as the hydrogen source is still a big challenge for industrial production.…”