Multi-stage dealumination for characteristicengineering of mordenite-clinoptilolitenatural zeolite

 
 
Penulis: Satriyo Krido Wahono, Dwi Joko Prasetyo, TriHadi Jatmiko, Diah Pratiwi, Andri Suwanto, Hernawan and Krasimir Vasilev
Porousmaterialshave beenappliedfor various applications, mainly as adsorbent and catalyst. One of themis zeolite, particularly in a synthetic form which has excellent performancebut has some drawbacks of high cost, complex processing, and waste production.Meanwhile, naturalzeolite is available in abundant amount and has low-cost provisioning, so it has prospective room for developed. Someof the common types of natural zeolitesaremordenite and clinoptilolite; one of the availabilitiesis locatedin Gunungkidul, Yogyakarta, Indonesia. The typical modification of zeolite is dealumination which was also appliedto the natural zeolite.Dealumination was carried out to improve the natural zeolite properties, particularly Si/Al ratio. The various typesof dealumination process wereconducted in variable ofacid concentration (0 to12 N HCl), volume ratio (1:1, 1:2,1:4),soaking time studies (1, 2, 4, 24 hours),agitation (stirring and no stirring), and multi-stage dealumination (1 to 10 stages). XPS analysis determined the Si/Al ratio, then supported by XRD and BET to explore the other characteristics transformation of crystal structure and specific surface area. In the single stage dealumination, the highest Si/Al ratio of 16.2was producedat12 N HCl, 1:4volume ratio, 24 hours soaking time and stirring action.Meanwhile, the multi-stage dealumination has the evidence to improve the Si/Al ratio sequentially than others variablein single stage dealumination; the highest Si/Al ratio attained overthan 120 at the most upper stage of dealumination. Moreover, dealumination treatment also increases the specific surface area over than220 m2/g, but the multi-stage variable was not affected much. The multi-stage dealumination effect provides prospectiveapplication ofmordenite-clinoptilolitenatural zeolite, particularlyin the highSi/Al ratio, as hydrophobic surface porous adsorbent or catalyst

AIP Conference Proceedings, 2019, 2085, 020044-1–020044-9

DOI: 10.1063/1.5095022

No. Arsip : LIPI-20190329
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