Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 55, Issue 27, Pages 7355-7361Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.6b00823
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Funding
- Center for Understanding and Control of Acid Gas-Induced Evolution of Materials for Energy (UNCAGE-ME)
- Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, at Oak Ridge National Laboratory and at Georgia Tech [DE-SC0012577]
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Carbonaceous nanomaterials with uniform pore size are potential solid sorbents in various industrial applications, such as gas purification and water treatment, because of their easily tunable pore diameter and morphology. However, the carbon-based sorbents are greatly limited in CO2 capture, because of their weak interaction with CO2 (physical adsorption in nature). This work reports the amino functionalizalion of micronized and nanosized mesoporous carbons for CO2 capture. Two strategies, i.e., physical impregnation with branched polyethylenimine (PEI) and chemical grafting of ethylenediamine, are used to functionalize mesoporous carbon microparticles (MCMs) with a particle size of 100-200 pan. The amine-grafted MCMs (NH2-MCMs) show little advantage over PEI-impregnated MCMs (PEI/MCMs) in CO2 adsorption capacities, because of their similar surface functional groups and textural properties. In addition, mesoporous carbon nanospheres (MCNs) with a sphere size of 850-1000 nm are prepared by a silica-assisted self-assembly method for comparison with MCMs. The PEI-impregnated MCNs (PEI/MCNs) have higher CO2 adsorption capacities and amine efficiencies than PEI/MCMs at the same PEI loading, indicating a more efficient utilization of the incorporated PEI in the nanosized carbon spheres. The best performing PEI/MCNs adsorbent shows a CO2 capacity of 1.97 mmol-CO2 g(-1) at 75 degrees C, which is more than three times that of PEI/MCMs.
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