Department of Chemistry
Indian Institute of Technology Delhi

Green Synthesis of Zeolites from Fly Ash and their Application for Environmental Protection

Prof. Y. Kalvachev

Institute of Catalysis, Bulgarian Academy of Sciences, Sofia, Bulgaria

Date: March 22nd 2019 (Friday)
Time: 11:30 AM
Venue: Committee Room (MS710), Chemistry Department, 6th Floor

Abstract: Coal combusting power plants are simultaneously among the main emitters of carbon dioxide and the main generator of solid by-products, such as fly ash (FA). An attempt to find a common solution for these environmental problems is reported. Zeolites analcime and faujasite (X) have been successfully synthesized by interaction of FA, originating from lignite coal at Maritsa Iztok 2 thermal power plant with sodium hydroxide, followed by hydrothermal treatment. NaX zeolite crystallisation started later by decreasing NaOH amount. In order to optimise synthesis process a seed-assisted procedure was introduced. In this way, zeolitisation may increase cost-effectiveness and eco-efficiency. Synthesized zeolites were used in environmental protection processes. Zeolite X was used in CO2 adsorption and VOCs oxidation, while analcime in purification of phenol contaminated water. Determination of adsorption capacity towards CO2 was measured to be 60 mg g-1 and the adsorption-desorption equilibrium was reached after one hour. The adsorption capacity towards phenol was measured to be 14 mg g-1adsorbent.

All are cordially invited to attend.
Convener (Chemical Society)