Natural aluminosilicate nanotubes loaded with RuCo as nanoreactors for Fischer-Tropsch synthesis

Abstract

Following nanoarchitectural approach, mesoporous halloysite nanotubes with internal surface composed of alumina were loaded with 5–6 nm RuCo nanoparticles by sequential loading/reduction procedure. Ruthenium nanoclusters were loaded inside clay tube by microwave-assisted method followed by cobalt ions electrostatic attraction to ruthenium during wetness impregnation step. Developed nanoreactors with bimetallic RuCo nanoparticles were investigated as catalysts for the Fischer-Tropsch process. The catalyst with 14.3 wt.% of Co and 0.15 wt.% of Ru showed high activity (СO conversion reached 24.6%), low selectivity to methane (11.9%), CO 2 (0.3%), selectivity to C 5+ hydrocarbons of 79.1% and chain growth index (α) = 0.853. Proposed nanoreactors showed better selectivity to target products combined with high activity in comparison to the similar bimetallic systems supported on synthetic porous materials. It was shown that reducing agent (NaBH 4 or H 2 ) used to obtain Ru nanoclusters at first synthesis step played a very important role in the reducibility and selectivity of resulting RuCo catalysts.

Halloysite-Based Magnetic Nanostructures for Diverse Applications: A Review

“…The longest alkyl chain (C18) achieved almost complete Ru loading, resulting in the synthesis of metal particles with a diameter from 4.6 to 5.0 nm inside the nanotube lumen . Various metallic and bimetallic HNT-based catalysts have been prepared, such as In 2 O 3 , CdS, MnCo, Ru, CuO-In 2 O 3 , CuO-In 2 O 3 , Ru/CdS, and RuCo, and have shown high catalytic selectivity and reactivities. − …”

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

“…For useful architecture, it is essential to provide building nanoblocks with specic properties such as, for example, synthesis of monometallic Ru and bimetallic RuCo particles of 3-6 nm in diameter selectively inside the halloysite lumen. 36,37 To achieve loading of RuCo in the aluminosilicate tubes, ruthenium nanoclusters were rst formed inside the clay tubes by a microwave-assisted method (Fig. 3).…”

Direct Synthesis of Dimethyl Ether from CO2 Hydrogenation over Core-Shell Nanotube Bi-Functional Catalyst

“…Recently, Mazurova et al and his team have proposed using HNTs as support for RuCo catalysts in Fischer-Tropsch synthesis. They found that HNTs loaded with bimetallic RuCo nanoparticles of 5-6 nm were more selective and active than systems based on synthetic aluminosilicates, silicates, and G-Al 2 O 3 [37]. Halloysite nanotubes can also be loaded with negatively-charged active species, which can be protected inside the inner lumen of the nanotubes.…”