Adsorption of sulfur dioxide on natural clinoptilolite chemically modified with salt solutions

Influence of the exchangeable cations on SO2 adsorption capacities of clinoptilolite-rich natural zeolite

“…It was found that the adsorption capacity of SO 2 depended on the cation electronegativity and ionic potential. This is in agreement with previous papers (Sirkecioglu et al 1995;Ivanova and Koumanova 2009). A similar order for SO 2 adsorption was determined for cationic forms of Turkey clinoptilolite: H + > Na + > K + > Ca 2+ (Sirkecioglu et al 1995).…”

“…A similar order for SO 2 adsorption was determined for cationic forms of Turkey clinoptilolite: H + > Na + > K + > Ca 2+ (Sirkecioglu et al 1995). Ivanova and Koumanova (2009) found that the adsorption capacity of the Na-form of natural clinoptilolite from Bulgaria was the highest. Capacity of clinoptilolites for SO 2 ranged from 2.083 mmol/g to 2.967 mmol/g in this study (Table 2).…”

“…Although zeolites are very good adsorbents for many gasses, a limited number of studies were reported on the adsorption of SO 2 by natural (Roux et al 1973;Valyon et al 1976;Hayhurst 1980;Kallo et al 1982;Axente et al 1983;Asenov et al 1984;Sirkecioglu et al 1995;Mihaila et al 1997;Caputo et al 2001;Demirtaş 2006;Ivanova and Koumanova 2009) and synthetic zeolites (Sharonova et al 1991;Deng and Lin 1995;Srinivasan and Grutzeck 1999;Marcu and Sȃndulescu 2004). The aim of this study is to evaluate the structural behavior and SO 2 adsorption of Bigadiç clinoptilolite-rich zeolite and those of modified forms.…”

Direct synthesis of dimethyl ether on the admixed nanocatalystsof CuO–ZnO–Al2O3 and HNO3-modified clinoptilolite at high pressures: Surface properties and catalytic performance

“…Among zeolites, clinoptilolite is the most common natural zeolite with a low Si/Al ratio, and large intersecting open channels of 8-and 10-member tetrahedral rings [20,21]. Its low cost and unique structure help clinoptilolite to be utilized as a cation exchange in adsorption of ammonia and heavy metals from waste waters and adsorption/ desorption of gases in gas treatment processes [22][23][24][25][26]. Furthermore, zeolite properties contribute to an extended field of catalytic processes [27,28].…”

Unheated and Heated Batch Methods in Ion Exchange of Clinoptilolite

“…It is well known that natural zeolites consist of aluminia and silica tetrahedra which, bound in a definite way, include crystal structure vacancies, channels and pores [1,2] . About 40 natural zeolites have been identified during the past 200 years; the most widespread are analcime, chabazite, clinoptilolite, erionite, ferrierite, heulandite, laumontite, mordenite, and phillipsite.…”