科研之友
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摘要
Iron incorporated zeolites were prepared from Na-A type zeolite synthesized from melting slag and FeCl(3) solution and applied as adsorbents for NH(3) and H(2)S gases. Iron incorporated zeolite was pelletized, calcined and used for gas adsorption experiment. XRD analyses of the zeolite revealed that Fe(3+) concentration of solution more than 90 mM could destruct the zeolite network structure. It was observed that the gas adsorption capacities of these zeolite pellets depend significantly on iron concentration of solution and calcination temperature. The type of binders affected a little on gas adsorption capacities. From adsorption results, adsorption capacity for NH(3) was proportional to Fe(3+) concentration and it was increased with calcination temperature up to 500 degrees C, but it was decreased over 600 degrees C. Pellets prepared from 56 mM Fe(3+) solution calcined at 500 degrees C showed highest ammonia adsorption capacity (3.7%). This iron incorporated Na-A type zeolites showed much higher adsorption capacities for NH(3) (2.4 similar to 3.7%) than commercially available activated carbons (0.16 similar to 0.44%) and zeolites (0.23 similar to 0.60%). In the case of adsorption capacities for H(2)S, adsorption capacity was proportional to Fe(3+) concentration and inversely proportional to calcination temperature. Pellets prepared from 78 mM Fe(3+) solution calcined at 200 degrees C showed highest hydrogen sulfide adsorption capacity (1.5%). Adsorption capacity (0.2 similar to 1.5%) was found to be lower than that of the commercial activated carbons (1.2 similar to 2.4%) and higher than that of commercial zeolites 4A (0.15%) and 13X (0.91%). Higher ammonia adsorption in iron incorporated Na-A zeolites could be possibly due to development of number of acid sites on the zeolites surface due to incorporation of Fe(3+) ion. [doi:10.2320/matertrans.M2009175]
- 出版日期2009-10
