Enhanced CO2 Adsorption on Nitrogen-Doped Carbon Materials by Salt and Base Co-Activation Method

Abstract

Nitrogen-doped carbon materials with enhanced CO2 adsorption were prepared by the salt and base co-activation method. First, resorcinol-formaldehyde resin was synthesized with a certain salt as an additive and used as a precursor. Next, the resulting precursor was mixed with KOH and subsequently carbonized under ammonia flow to finally obtain the nitrogen-doped carbon materials. A series of samples, with and without the addition of different salts, were prepared, characterized by XRD (X-ray powder diffraction), elemental analysis, BET (N2-adsorption-desorption analysis), XPS (X-ray photoelectron spectroscopy) and SEM (Scanning electron microscopy) and tested for CO2 adsorption. The results showed that the salt and base co-activation method has a remarkable enhancing effect on the CO2 capture capacity. The combination of KCl and KOH was proved to be the best combination, and 167.15 mg CO2 could be adsorbed with 1 g nitrogen-doped carbon at 30 °C under 1 atm pressure. The materials characterizations revealed that the introduction of the base and salt could greatly increase the content of doped nitrogen, the surface area and the amount of formed micropore, which led to enhanced CO2 absorption of the carbon materials.

Polybenzodiazine Aerogels: All-Nitrogen Analogues of Polybenzoxazines─Synthesis, Characterization, and High-Yield Conversion to Nanoporous Carbons

“…It has been discussed that along with the porosity and surface structure, heteroatoms such as O and N may play a decisive role in the properties of porous carbon materials . In particular, nitrogen-containing functional groups, e.g., in pyridinic and pyridonic positions, are responsible for adding basic character to the derived carbons, which is thought to improve interaction with CO 2 for adsorption applications. ,− Along these lines, two main approaches have been used for introducing nitrogen in porous carbons: by post-treatment with nitrogen-containing molecules such as ammonia, urea, melamine, nitric acid, etc . or by the in situ method, which relies on using nitrogen-containing polymeric carbon precursors, and involves a judicious choice of the polymerization chemistry and selection of monomers …”

Element-Doped Functional Carbon-Based Materials

“…Carbon capture is a growing technology, whose implementation can be achieved by the research of novel materials. R. Wei et al [18] prepared N-doped carbon materials from resorcinol and formaldehyde after KOH activation and ammonia carbonization. A.…”

Preparation of carbon/carbon composite xerogels from resorcinol-formaldehyde and cotton fiber for electric double layer capacitor

“…This indicates that the CO 2 activation times are affected by the structure of the activated carbon/carbon composite xerogels. In addition, several publications suggest that graphite can be reconstructed into the carbon in randomly oriented layers [32,33].…”