Multi-stage dealumination for characteristic engineering of mordenite-clinoptilolite natural zeolite

Satriyo Krido Wahono, Dwi Joko Prasetyo, Tri Hadi Jatmiko, Diah Pratiwi, Andri Suwanto, Hernawan, Krasimir Vasilev

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Citations (Scopus)


Porous materials have been applied for various applications, mainly as adsorbent and catalyst. One of them is zeolite, particularly in a synthetic form which has excellent performance but has some drawbacks of high cost, complex processing, and waste production. Meanwhile, natural zeolite is available in abundant amount and has low-cost provisioning, so it has prospective room for developed. Some of the common types of natural zeolites are mordenite and clinoptilolite; one of the availabilities is located in Gunungkidul, Yogyakarta, Indonesia. The typical modification of zeolite is dealumination which was also applied to the natural zeolite. Dealumination was carried out to improve the natural zeolite properties, particularly Si/Al ratio. The various types of dealumination process were conducted in variable of acid concentration (0 to 12 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 16.2 was produced at 12 N HCl, 1:4 volume 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 variable in single stage dealumination; the highest Si/Al ratio attained over than 120 at the most upper stage of dealumination. Moreover, dealumination treatment also increases the specific surface area over than 220m 2 /g, but the multi-stage variable was not affected much. The multi-stage dealumination effect provides prospective application of mordenite-clinoptilolite natural zeolite, particularly in the high Si/Al ratio, as hydrophobic surface porous adsorbent or catalyst.

Original languageEnglish
Title of host publication11th Regional Conference on Chemical Engineering, RCChE 2018
EditorsTeguh Ariyanto, Imam Prasetyo, Rochmadi, Nur Rofiqoh Eviana Putri
PublisherAmerican Institute of Physics Inc.
Number of pages9
ISBN (Electronic)9780735418158
Publication statusPublished - 21 Mar 2019
Externally publishedYes
Event11th Regional Conference on Chemical Engineering, RCChE 2018 - Yogyakarta, Indonesia
Duration: 7 Nov 20188 Nov 2018

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference11th Regional Conference on Chemical Engineering, RCChE 2018


  • Dealumination
  • Zeolites


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