Chitosan-assisted Synthesis of Binderless Zeolite X Microspheres and Their CO2 Adsorption Properties

• 1、State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009
• 2、College of Mechanic and Power Engineering, Nanjing University of Technology, Nanjing 210009

Abstract：Binderless zeolite NaX microspheres could be readily prepared by using chitosan-assisted synthesis. X-ray diffraction, scanning electron microscopy, and low temperature N2 adsorption were applied to examine the obtained products. The microspheres with uniform size of ca. 1.3 mm, medium crashing strength and larger surface area of 930 m2 g-1 are composed of compactly packed and intergrown octahedral particles with a particle size of ca. 500-750 nm. CO2, CH4 and N2 adsorption at 298 K and ambient pressure and Ca2+ and K+-exchanged ones were measured. Separation of CO2/CH4 and CO2/N2 mixtures on the CaX microspheres in breakthrough experiments was performed. The results indicate all of the three types zeolite microspheres preferential adsorb CO2 and can be used as CO2 adsorbent for different needed. The separation factors of CO2/N2 and CO2/CH4 mixtures on CaX microspheres are 79 and 12.

Keywords： Chitosan Binderless zeolite X microsphere Ion exchange CO2 Adsorption and separation