Next Article in Journal
Optimization of Hybrid Sol-Gel Coating for Dropwise Condensation of Pure Steam
Previous Article in Journal
Use of A Hydroalcoholic Extract of Moringa oleifera Leaves for the Green Synthesis of Bismuth Nanoparticles and Evaluation of Their Anti-Microbial and Antioxidant Activities
Open AccessArticle

Study on CO2 Capture Characteristics and Kinetics of Modified Potassium-Based Adsorbents

College of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
Author to whom correspondence should be addressed.
Materials 2020, 13(4), 877;
Received: 19 December 2019 / Revised: 6 February 2020 / Accepted: 14 February 2020 / Published: 15 February 2020
In this paper, a silica aerogel support was prepared by two-step sol–gel method, and the active component K2CO3 was supported on the support by wet loading to obtain a modified potassium-based CO2 adsorbent. As the influences of reaction conditions on the CO2 capture characteristics of modified potassium-based adsorbents, the reaction temperature (50 °C, 60 °C, 70 °C, 80 °C), water vapor concentration (10%, 15%, 20%), CO2 concentration (5%, 10%, 12.5%, 15%), and total gas flow rate (400 mL/min, 500 mL/min, 600 mL/min) were studied in a self-designed fixed-bed reactor. At the same time, the low-temperature nitrogen adsorption experiment, scanning electron microscope, and X-ray diffractometer were used to study the microscopic characteristics of modified potassium-based adsorbents before and after the reaction. The results show that the silica aerogel prepared by the two-step sol–gel method has an excellent microstructure, and its specific surface area and specific pore volume are as high as 838.9 m2/g and 0.85 cm3/g, respectively. The microstructure of K2CO3 loaded on the support is improved, which promotes the CO2 adsorption performance of potassium-based adsorbents. The adsorption of CO2 by potassium-based adsorbents can be better described by the Avrami fractional kinetic model and the modified Avrami fractional kinetic model, and it is a complex multi-path adsorption process, which is related to the adsorption site and activity. The optimal adsorption temperature, water vapor concentration, CO2 concentration, and total gas volume were 60 °C, 15%, 12.5%, and 500 mL/min, respectively. View Full-Text
Keywords: aerogel; potassium-based adsorbent; modification; CO2 capture; kinetics aerogel; potassium-based adsorbent; modification; CO2 capture; kinetics
Show Figures

Figure 1

MDPI and ACS Style

Guo, B.; Wang, Y.; Shen, X.; Qiao, X.; Jia, L.; Xiang, J.; Jin, Y. Study on CO2 Capture Characteristics and Kinetics of Modified Potassium-Based Adsorbents. Materials 2020, 13, 877.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop