(189e) High-Temperature CO2 Adsorption On LiXZrYOZ Ceramics | AIChE

(189e) High-Temperature CO2 Adsorption On LiXZrYOZ Ceramics

Authors 

Zhang, Q. - Presenter, East China University of Science and Technology
Yin, X. - Presenter, East China University of Science and Technology
Yu, J. - Presenter, East China University of Science and Technology


CO2 is one of the major greenhouse gases (GHG) and the largest contributor to the global warming effects (about 60% in regard of its amount in the atmosphere), and coal-burning power plant is the major source of CO2 generation with the typical CO2 content about 10-13%, thus, CO2 adsorption from the flue gas might be an effective approach for CO2 Capture and Storage (CCS). Various materials have been proposed as CO2 captors, including zeolites, carbon-based adsorbent, hydrotalcites and metal oxides. However, the temperature of the flue gas vent is about 573-773 K depended on various follow-up process of waste heat utilization, it is highly desired to separate CO2 directly from flue gas at high temperature so as to use it as a feedstock for the synthesis of methanol and other chemicals, and the adsorbents should generally have high selectivity and adsorption capacity for CO2 at high temperature, as well as good adsorption-regeneration kinetics and high multi-cycle stability. In this paper, pure monoclinic Li6Zr2O7 and rhombohedral Li8ZrO6 with fraction of Li6Zr2O7 are synthesized via co-precipitation method and characterized by SEM, TGA, and high-temperature CO2 adsorption-desorption measurement. The adsorbents exhibit slow CO2 uptake rate since the inhibited diffusion of CO2 in the solid carbonate shell at T<973 K, as T>983 K (the Li2CO3 melting point), the CO2 uptake rate enhances remarkably with 12.3% and 35.0% weight gain within 15 min at 1073 K respectively. The possible pathway of the adsorption process is further proposed. The Li6Zr2O7 and Li8ZrO6 are promising candidates for CO2 high-temperature adsorption.