251233 Development of High Performance Carbon-Based Adsorbents for CO2 Adsorption

Wednesday, October 31, 2012: 10:30 AM
336 (Convention Center )
Placidus B. Amama, RXBT/UDRI, Air Force Research Laboratory, Wright-Patterson AFB, OH and Patrick J. Shamberger, RXBT, Air Force Research Laboratory, Wright-Patterson AFB, OH

Thermal management of high-power systems is a pressing challenge for many USAF platforms.  These systems require rapid absorption and ultimately rejection of low-quality (low temperature) heat. Activated carbon is capable of adsorbing pressurized CO2 gas with a high heat of adsorption, offering the possibility of rapidly absorbing and rejecting heat at low temperatures. The activated carbon adsorbent has to meet important performance criteria for high efficiency of the system. The performance criteria include high adsorption capacity, high adsorption kinetics, excellent stability and mechanical properties, and high thermal conductivity.  For activated carbon adsorbents to meet all of these criteria, the CO2 adsorption capacity and the adsorption-desorption kinetics must be improved.  The adsorption of CO2 on activated carbon can be significantly enhanced by the introduction of basic nitrogen functionalities on the surface. In this work, surface modification of a series of activated carbon adsorbents via gas phase amination under various conditions has been performed. The surface area, pore structure and pore volume were characterized using N2 physisorption while the types of chemical functionalities present on the surface after amination were characterized by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and temperature programmed desorption (TPD). CO2 adsorption on the modified activated carbon samples have been measured gravimetrically using a high-pressure TGA.

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See more of this Session: CO2 Capture, Control and Sequestration I
See more of this Group/Topical: Sustainable Engineering Forum