LAUSR

Development of highly efficient adsorbents for the high temperature CO2 capture process is crucial for large scale implementation of this technology. In this work, development of novel potassium- and sodium-promoted CaO adsorbents (K–Ca and Na–Ca) is discussed, and their CO2 capture performance at high temperatures is presented. A series of K–Ca and Na–Ca adsorbents with various K/Ca or Na/Ca molar ratios were developed and tested for CO2 capture at high temperatures ranging from 300 to 400 °C. The structural, chemical, and morphological characteristics of the double salts were systematically evaluated before and after exposure to CO2. Our results indicated that CO2 capacity is largely influenced by both K or Na concentration and adsorption temperature. Maximum capacities of 3.8 and 3.2 mmol/g were obtained for K–Ca and Na–Ca double salts, respectively, at 375 °C and 1 bar. Further investigation of the effect of temperature revealed that the window temperature for operation ranges from 300 to 650 °C, whil...