engleski

Natural zeolite from Krapina region, Croatia for ammonia gas sorption

The paper investigates the possibility of ammonia sorption from air by using natural zeolite (clinoptilolite) from sedimentary ore from the area of Donje Jesenje, Krapina, Croatia. Ammonia sorption on unmodified and modified zeolite samples was established at different initial concentrations of NH3. Natural exchanger was activated with NaCl, KCl, CaCl2 and MgCl2 salts solutions, treatment with HCl acid and NaOH base and was thermally activated at different temperatures. Results have shown that the acid-modified zeolite sample exhibited much better ammonia sorption capacity compared to natural zeolite. Acid treatment of zeolite increased its specific area and micropore volume, which were reduced by the basic and thermal treatments. Among the Na-form, K-form, Ca-form and Mg-form of zeolite, the best ammonia sorption was achieved with Ca- and Mg-forms.

natural zeolite ; ammonia adsorption

nije evidentirano