Imine-Linked Polymer Based Nitrogen-Doped Porous Activated Carbon for Efficient and Selective CO2 Capture

Abstract

The preparation of nitrogen-doped activated carbon (NACs) has received significant attention because of their applications in CO2 capture and sequestration (CCS) owing to abundant nitrogen atoms on their surface and controllable pore structures by carefully controlled carbonization. We report high-surface-area porous N-doped activated carbons (NAC) by using soft-template-assisted self-assembly followed by thermal decomposition and KOH activation. The activation process was carried out under different temperature conditions (600–800 °C) using polyimine as precursor. The NAC-800 was found to have a high specific surface area (1900 m2 g−1), a desirable micropore size below 1 nm and, more importantly, a large micropore volume (0.98 cm3 g−1). NAC-800 also exhibits a significant capacity of CO2 capture i.e., over 6. 25 and 4.87 mmol g−1 at 273 K and 298 K respectively at 1.13 bar, which is one of among the highest values reported for porous carbons so far. Moreover, NAC also shows an excellent separation selectivity for CO2 over N2.

Heteroatom functionalized activated porous biocarbons and their excellent performance for CO2 capture at high pressure

“…15 However, it is a big challenge to devise a combination of both N-doping and a high surface area in the porous carbons. In general, nitrogen can be incorporated into the carbon structure by two methods: by direct carbonization of N-rich precursors such as acrylonitrile/acrylamide, 16 polyimine, 17 dicyandiamide, 18 etc. that are incorporated into the porous inorganic templates, or post treatment of the carbonized precursor with chemicals such as NH 3 (ref.…”

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

“…Global warming due to the enhanced anthropogenic emissions of CO 2 from industries and other human activities has resulted in unprecedented climate change on a global scale and it needs to be addressed as a high priority problem . Although CO 2 contribution from anthropogenic sources is approximately 5%, it is more than enough to upset the natural balance of the ecosystem leading to unexpected changes in climate all over the world.…”

“…Global warming due to the enhanced anthropogenic emissions of CO 2 from industries and other human activities has resulted in unprecedented climate change on a global scale and it needs to be addressed as a high priority problem. [1] Although CO 2 contribution from anthropogenic sources is approximately 5%, it is more than enough to upset the natural balance of the ecosystem leading to unexpected changes in climate all over the world. Since 18 th century, the level of CO 2 in the atmosphere has risen progressively from 278 ppm to more than 400 ppm in recent times, which along with other greenhouse gases contributes to more than 480 ppm of total CO 2 equivalent emissions.…”

Selective Carbon Dioxide Capture Using Silica‐Supported Polyaminals

“…The post‐combustion CO 2 capture application need moderate physisorption range (30 kJ/ mol to 50 kJ/ mole), because, the flue gases consist only 15% of CO 2 . The Isosteric heat of adsorption values of these materials are comparable to the most of the nitrogen‐rich polymers, and also these values are lower than amine functionalized silicas . The liquid sorbents possess high heat of adsorption (chemisorption), it need high energy for regeneration.…”

“…These values indicate physisorption of CO 2 with Si-PAs, [45] therefore, these materials need low energy for regeneration. The previously reported amine functionalized silicas have high heat of adsorption by means of [36,40,[49][50][51] and also these values are lower than amine functionalized silicas. [32,45] The liquid sorbents possess high heat of adsorption (chemisorption), it need high energy for regeneration.…”