Cobalt Nanoparticle-Decorated LDH/ZIF-Derived Porous Nanoplatelets for Fischer–Tropsch Synthesis

Abstract

It is a significant challenge to prepare highly active and high-cobalt (Co) loading Fischer–Tropsch synthesis (FTS) catalysts for syngas conversion. Herein, a metal–organic framework named ZIF-67 was grown in situ on a CoAl layered-double-hydroxide (LDH) to obtain hierarchical LDH/ZIF-67 structures. Highly dispersed cobalt (Co)-embedded porous nanoplatelet (CoPNP) catalysts suitable for FTS were prepared by subsequent pyrolysis. High Co loading (over 50 wt % Co) was realized in CoPNP with suitable particle sizes and active Co dispersion. Remarkably, CoPNP showed a hierarchical architecture with a high specific surface area, and the porous channels could enhance syngas diffusion and hydrocarbon production, boosting the CO conversion and C5+ selectivity. Consequently, CoPNP revealed extraordinarily high activity in FTS with maximum 71.6% CO conversion and 70.2% C5+ long-chain hydrocarbon selectivity. The work reveals a methodology for the design and preparation of FTS catalysts with boosted performance and affords a promising pathway to design other FTS catalysts.

Application of metal-organic frameworks and their derivates for thermal-catalytic C1 molecules conversion

“…prepared ZIF-67 MOFs grown in situ on CoAl LDH and subsequently prepared highly dispersed Co-embedded porous nanoparticle (CoPNP) catalysts for FTS by pyrolysis. 51 The CoPNP showed a hierarchical structure with a high specific surface area. The CoPNP showed a hierarchical structure with a high specific surface area, and the porous channels could enhance syngas diffusion and hydrocarbon production and improve CO conversion and C 5+ selectivity, with CO conversion up to 71.6% and C 5+ long-chain hydrocarbon selectivity up to 70.2% ( Figure 5 ).…”

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Figure 5 Schematic of the preparation of CoPNP catalysts and the production of C 5+ long-chain hydrocarbons from syngas Reproduced with permission from Luo et al. 51 Copyright © 2021, American Chemical Society.

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Synthesis of 20-nm-sized CoAl-LDH nanoparticles modified with folic acid for enhanced cancer cell targeting

“…21 The material can be obtained through a one-pot synthesis at room temperature under an ambient atmosphere, allowing for bulk synthesis. The size of the CoAl LDH nanoparticles is smaller compared to ones prepared though general synthesis strategies such as the co-precipitation route (particle size: 80-250 nm), 22,23 the urea hydrolysis route (particle size: 2-8 mm), [24][25][26][27][28] and the glycidol alkalization route (2-12 mm). 29 Thanks to their morphological features, the CoAl LDH nanoparticles reportedly exhibit a 47 times higher rate of degradation of dye molecules and 13.6 times higher specific surface area compared to standard CoAl LDH with micrometer size.…”