Physical-chemical characteristics of zeolites, among other things, depend on the ratio of silicon and aluminum in their crystal structure. What makes zeolite particularly interesting is a great possibility of its modification, which results in new materials of desired characteristics. Due to their polyfunctional characteristics and a big spectrum of application in almost all industry branches, the interest in zeolites is constantly growing. This study examined adsorption of propane acid from the aqueous solution on high-silica zeolite samples produced by the modern nanotechnologies in the American company Zeolyst International (sign: CBV 28014). The adsorbents used were NH ZSM-5 zeolite and its modified form-HZSM-5, with the ratio of SiO /Al O equaling 280. Adsorption was examined in the temperature interval from 283 K to 303 K. The results proved that the growth of adsorption temperature resulted in the growth of the quantity of adsorbed propane acid both on the original and on the modified form of ZSM-5 zeolite, which indicated that in addition to physical adsorption the chemisorption also occurred, where the acid molecules were bonded to active centers by stronger chemical bonds. HZSM-5 zeolite, compared with NH ZSM-5 zeolite, as expected, proved to be a better adsorbent for propane acid.
