N‐doped porous carbons for CO₂ capture: Rational choice of N‐containing polymer with high phenyl density as precursor

Abstract

in Wiley Online Library (wileyonlinelibrary.com) N-doped porous carbons (NPCs) are highly promising for CO 2 capture, but their preparation is severely hindered by two factors, namely, the high cost of N-containing polymer precursors and the low yield of carbon products. Here we report for the first time the fabrication of NPCs through the rational choice of the polymer NUT-4, with low cost and high phenyl density, as precursor. For the material NPC-600 obtained from carbonization at 6008C, the yield is as high as 52.1%. The adsorption capacity of CO 2 on NPC-600 reaches 6.9 mmol/g at 273 K and 1 bar, which is obviously higher than that on the benchmarks, including 13X zeolite (4.1 mmol/g) and activated carbon (2.8 mmol/g), as well as most reported carbon materials. Our results also demonstrate that the present NPCs can be completely regenerated under mild conditions. The abundant microporosity and "CO 2 -philic" (N-doped) sites are responsible for the adsorption performance.

One‐pot synthesis of high N‐doped porous carbons derived from a N‐rich oil palm biomass residue in low temperature for CO 2 capture

“…In addition, the adsorption of CO 2 decreased while the activation temperature aggrandized to 550°C. It can be seen from Table that at atmospheric pressure, the adsorption amount of the adsorbent for CO 2 was 3.06‐5.63 mmol/g at 273 K, and the adsorption amount was 2.04‐3.51 mmol/g at 298 K. This value, 3.51 mmol/g, was below than those of lately published adsorbents prepared through KOH activation, while it was similar or higher than some typical biomass‐derived porous carbons, some MOFs, COFs, and ZIFs at 298 K under 1 bar. Comparison of different porous adsorbents has been summarized in Table S1.…”

“…It was universality acknowledged that nitrogencontaining samples for CO 2 adsorption were regulated by porous structure and nitrogen content of adsorbents. 31,35 The relation between porous structure and CO 2 adsorption was plotted in Figure S1. The porous structure included S BET , V t , V m, and V n .…”

Constructing Hierarchically Porous N-Doped Carbons Derived from Poly(ionic liquids) with the Multifunctional Fe-Based Template for CO2 Adsorption

“… 1 − 5 Therefore, it has a wide application scope in the fields of adsorption, energy, catalysis, environment and separation, and so forth. 6 − 9 The general strategy to prepare porous carbon materials with large surface areas and the abundant pore structure can be summarized thus: hard or soft templates are applied in the carbonization process of a nitrogen-containing precursor. 10 , 11 However, this method still faces challenges in some degree.…”

Core–shell adsorbents by electrospun MOF‐polymer composites with improved adsorption properties: Theory and experiments

“…For an adsorbent to be used for postcombustion carbon capture, it must exhibit great stability, high CO 2 uptake at 1 bar above 40°C and reasonably reject N 2 adsorption to minimize the energy penalty of regeneration . Many materials have been examined for the carbon capture application including porous carbons, zeolites, polymers, and MOFs . Although some MOFs demonstrate superior performance in CO 2 uptake, including MgMOF‐74 with a CO 2 capacity of 8.61 mmol/g, these same MOFs lack water stability and N 2 rejection.…”