Energy Efficient Synthesis of Ordered Mesoporous Carbon Nitrides with a High Nitrogen Content and Enhanced CO₂ Capture Capacity

Abstract

Highly ordered mesoporous carbon nitrides (MCN) with 3D structure and a high nitrogen content are successfully prepared for the first time using "uncalcined" mesoporous silica template, KIT-6 and 3-amino-1,2,4-triazole as a single molecular carbon and nitrogen precursor. The prepared MCN with C and N stoichiometry of C N shows unique CN framework and exhibits the CO capture capacity of 5.63 mmol g at 273 K and 30 bar, which is higher than that of MCN with 2D structure and C N stoichiometry.

Metal organic framework derived mesoporous carbon nitrides with a high specific surface area and chromium oxide nanoparticles for CO2 and hydrogen adsorption

“…It is interesting to note that the amount of nitrogen adsorbed in the monolayer region of the isotherm for Cr-MCN-10 which is used for the calculation of the specic surface area is much higher than those of other MCN samples discovered so far. 18,21,23,24,35,[39][40][41][42][43][44] Interestingly, the sample prepared with a low amount of AG registered the highest amount of nitrogen adsorption in the monolayer region than other samples prepared in this study. This indicates that the specic surface area of the samples can be controlled by varying the amount of AG precursor.…”

Facile One‐Pot Synthesis of Activated Porous Biocarbons with a High Nitrogen Content for CO2 Capture

“…On the other hand, non‐activated nitrogen containing carbon NEPB‐3U exhibits the CO 2 uptake of 4.3 and 2.8 mmol g −1 at 0 and 25 °C and 1 bar and 30 bar pressure, respectively. The highest CO 2 adsorption capacity of 14.1 mmol g −1 at 0 °C and 30 bar was recorded by NEPB‐3UK, which is three times higher than that of mesoporous carbon nitride materials with C 3 N 4 stoichiometry and two‐dimensional porous structure (4.67 mmol g −1 at 0 °C and 30 bar) . From Table it is evident that the CO 2 uptake performance of these materials is strongly dependent on the specific BET surface area of the materials, although the presence of basic functionalities further augments the CO 2 adsorption.…”

“…When tested under conditions that mimic pre‐and post‐combustion processes, the synthesized activated biocarbons demonstrated a high value of CO 2 uptake at 4.8 mmol g −1 and 14.1 mmol g −1 at 0 °C under a pressure variation of 1 bar and 30 bar, respectively. For better understanding, we compared the CO 2 adsorption capacities and isosteric heat of adsorptions of NEPB‐3UK with other N‐functionalized adsorbent materials including amines‐modified porous silica and zeolite, and mesoporous carbon nitrides (Table S3) ,. The high CO 2 adsorption capacity of these materials is attributed to the presence of high microporous surface area and high nitrogen content in the form of pyridinic‐N and pyrrolic‐N species in the framework of porous structure.…”

Ultrahigh Surface Area N‐Doped Hierarchically Porous Carbon for Enhanced CO2 Capture and Electrochemical Energy Storage

“…This indicated that the pore structure and N‐doping of the N‐HPC‐800 also influenced the high‐pressure CO 2 adsorption capacity. As demonstrated in previous reports, super‐micropores or small mesopores (below 2–3 nm) govern the sorption behavior at a high pressure, and basic functional groups by N‐doping are favorable for the adsorption of acidic CO 2 molecules . We compared the performances of our N‐HPC‐800 to representative porous carbon materials as CO 2 high‐pressure solid adsorbents.…”