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

Abstract

Summary Porous carbon materials have been widely used for CO2 adsorption, but their preparation was subject to conditions such as raw material cost, activator corrosion, and temperature. In this study, nitrogen‐doped porous carbonaceous adsorbents were prepared in a low temperature region (400‐550°C) by one‐step composite nitrogen doping method, using low‐cost oil residue as raw materials and less corrosive NaNH2 as activator. The CO2 adsorption performances of the prepared N‐doped porous adsorbents were systematically explored. The results showed that optimal oil residue‐derived carbonaceous adsorbent owned excellent amount of CO2 adsorption up to 3.51 and 5.63 mmol/g at 298 and 273 K under 1 bar, respectively. It was discovered that the congenerous influences of porous structure, nitrogen content and Vn of the adsorbent affected their CO2 adsorption performances under 1 bar. Importantly, these oil residue porous carbonaceous adsorbent also was verified owning fine selectivity of the CO2 over N2 (15.7), which attributed to its high Vn and nitrogen content. Furthermore, optimal sample OAC‐500‐2.5 owned medium Qst (21‐26 kJ/mol), which was beneficial practical application. This work may inspire new sparks on novel nitrogen‐doped adsorbent with inexpensive precursor, low activation temperature and simple preparative tactic, indicating that the nitrogen‐doped sample is promising in the practical situation of CO2 adsorption.

Modeling and Optimizing N/O-Enriched Bio-Derived Adsorbents for CO2 Capture: Machine Learning and DFT Calculation Approaches

“…The experimental data on nitrogen-doped AC or AC adsorbents including 217 data sets were collected from previous 30 publications and then were further utilized to design and test the ML technique, ,,,− ,− which was conducted by exploring different keywords (such as CO 2 capture and CO 2 adsorption combined with biochar, porous ACs, and N-doped ACs). SCOPUS, Web of Science, etc., were utilized as major databases to collect materials from the literature on CO 2 adsorption on ACs.…”

“…that are applied to different BCPs. , The advanced physicochemical features of BACs mostly rely on the type and mass ratio of activation agents (e.g., KOH, ZnCl 2 , H 2 O 2 , NaNH 2 , K 2 CO 3 ) and tuning parameters of thermochemical conversion (such as activation temperature, heating rate, gas flow rate, etc. ). − From the morphological perspective, BACs can possess diverse geometric configurations (hierarchical, sheet, tubular, and sphere) with extended surface area and porosity. These structural properties comparatively can lead to introducing valuable active surfaces, which subsequently result in efficient CO 2 physisorption. − …”

The impacts of nitrogen doping on the electrochemical hydrogen storage in a carbon

“…By virtue of their basically consistent atomic radii, doping N atoms into the carbon hexagon structure will not cause serious deformation of the carbon skeleton. 39,[41][42][43][46][47][48][49] At the same time, many meaningful defect sites can be successfully introduced to reinforce the adsorption and insertion of H atoms in the carbon materials. In addition, the lone pair electrons of each N atom are able to offer negative charges for the delocalized π system of sp 2 hybrid carbon, thus enhancing the electronic transmission as well as improving the conductivity and chemical activities of the carbon materials.…”

“…C and N are close to each other in the periodic table of elements. By virtue of their basically consistent atomic radii, doping N atoms into the carbon hexagon structure will not cause serious deformation of the carbon skeleton 39,41‐43,46‐49 . At the same time, many meaningful defect sites can be successfully introduced to reinforce the adsorption and insertion of H atoms in the carbon materials.…”

Influence of the interaction between activation conditions on the pore structure and CO 2 uptake of the prepared macadamia nutshell‐based activated carbon

“…In previous studies, 33 due to the limitation of experimental operating conditions, only a single activation condition was used as a linear variable to study its effect on the pore structure, and the actual multivariate changes could not be studied. Meanwhile, in the previous analysis, 34,35 only two-dimensional plots were used to explain the relationship between adsorption amount and activation conditions, and the effects of more variables could not be presented simultaneously. In this study, we examine the interactions between activation conditions and investigate their impact on the formation of pore structures.…”