Influence of precursor porosity on sodium and sulfur promoted iron/carbon Fischer–Tropsch catalysts derived from metal–organic frameworks

Abstract

a Iron-based metal-organic frameworks (MOFs) with varying porosity are converted by pyrolysis into iron/carbon catalysts with predetermined composition and tailored pore structural features for the FischerTropsch synthesis of lower C 2 -C 4 olefins. Significantly higher activity arises for catalysts with higher porosity and decreased iron particle size derived from hierarchical MOF xerogel/aerogel precursors as compared to a purely microporous MOF. Post-synthetic functionalization using sodium and sulfur promoters further enhances the catalytic properties.

Beyond Cars: Fischer‐Tropsch Synthesis for Non‐Automotive Applications

“…Alternatively, in terms of changing reaction feedstocks based on F‐T synthesis, one can employ CO 2 and H 2 instead of CO and H 2 as feedstocks, which is called as CO 2 ‐F‐T process to produce liquid fuels and chemicals ,. Beyond that, new highly active and stable F‐T catalysts can be synthesized by metal organic frameworks (MOFs) as precursors . These new pathways obviously extend the F‐T applications well to a broader platform, serving in the field of heterogeneous catalysis of carbon one chemistry.…”

Crucial Factors for the Application of Functional Nanoporous Carbon-Based Materials in Energy and Environmental Applications

“…MOF-derived carbons can be useful if the resulting NPCMs or metal(oxide)-containing NPCMs are suitable as model substances for academic purposes. One particular advantage of such materials is that the shape of the MOF crystals or particles can usually be precisely transferred to the resulting products, and hence, this is a particularly suitable system for the pore shape-controlled synthesis of carbon materials ( Figure 3b) [57,58]. However, this phenomenon of "shape conservation" (i.e., the macro-and mesoscopically conformal precursor-to-carbon transformation) is quite common also for many other carbon precursors such as carbides or polymers [28,59].…”

“…[44], a carbon aerogel (middle) [47], and a mesoporous carbon foam (right) [49]; (b) TEM images of iron/carbon materials derived from Fe-metal-organic framework (Fe-MOF) precursors with different porosity (left: MOF xerogel; middle: MOF aerogel; right: microporous MOF) [57]; (c) Schematic of the atomic structure of Ti3SiC2 (left) and 3C-SiC (right) and the corresponding carbide-derived carbon (CDC) structures with TEM images and pore size distributions after halogen treatment [60]. (a) reproduced from [44], with permission from Wiley, 2001, from [47], with permission from RSC Publishing, 2014, and from [49], with permission from Wiley, 2013; (b) reproduced from [57], with permission from RSC Publishing, 2017; (c) reproduced from [60], with permission from Wiley, 2011. [44], a carbon aerogel (middle) [47], and a mesoporous carbon foam (right) [49]; (b) TEM images of iron/carbon materials derived from Fe-metal-organic framework (Fe-MOF) precursors with different porosity (left: MOF xerogel; middle: MOF aerogel; right: microporous MOF) [57]; (c) Schematic of the atomic structure of Ti 3 SiC 2 (left) and 3C-SiC (right) and the corresponding carbide-derived carbon (CDC) structures with TEM images and pore size distributions after halogen treatment [60].…”

“…(a) reproduced from [44], with permission from Wiley, 2001, from [47], with permission from RSC Publishing, 2014, and from [49], with permission from Wiley, 2013; (b) reproduced from [57], with permission from RSC Publishing, 2017; (c) reproduced from [60], with permission from Wiley, 2011. [44], a carbon aerogel (middle) [47], and a mesoporous carbon foam (right) [49]; (b) TEM images of iron/carbon materials derived from Fe-metal-organic framework (Fe-MOF) precursors with different porosity (left: MOF xerogel; middle: MOF aerogel; right: microporous MOF) [57]; (c) Schematic of the atomic structure of Ti 3 SiC 2 (left) and 3C-SiC (right) and the corresponding carbide-derived carbon (CDC) structures with TEM images and pore size distributions after halogen treatment [60]. (a) reproduced from [44], with permission from Wiley, 2001, from [47], with permission from RSC Publishing, 2014, and from [49], with permission from Wiley, 2013; (b) reproduced from [57], with permission from RSC Publishing, 2017; (c) reproduced from [60], with permission from Wiley, 2011.…”

Micro‐Blooming: Hierarchically Porous Nitrogen‐Doped Carbon Flowers Derived from Metal‐Organic Mesocrystals

“…Metal‐organic coordination compounds, typically prepared by reacting metal salts with organic ligands, have shown promise as versatile precursors/templates for preparation of functional hierarchically porous carbons and their metal/metal oxide composites via a simple thermal transformation process . Particular attention has been paid to crystalline metal‐organic frameworks (MOFs) because of their highly ordered and chemically homogenous structures, tunable pore size, and large surface area, which are highly attractive features for fabricating advanced MOF‐derived nanomaterials with tailored properties .…”