Acid Treated Natural Zeolites and their Characteristics

Ayao Takasaka, Yoshihiro Matsuda, Hirohiko Kono

Research output: Contribution to journalArticlepeer-review


Natural Itaya and Nakano zeolites were treated with hydrochloric acid for 1hr at 100°C. The original zeolites and the treated ones were characterized by X-ray diffraction, chemical analysis, thermo-gravimetric analysis and adsorption. The X-ray diffraction patterns of the zeolite treated with 1mol·dm-3 acid and those of the untreated zeolite were almost identical, but the ratio of SiO2 to Al2O3 was different. The zeolite treated with acid rapidly increased its inner adsorption volume. The monolayer capacity of nitrogen gas rapidly increased as the amount of cations in the zeolite decreased. The effect of hydrochloric acid treatment on gas separation properties of natural Itaya and Nakano zeolites was investigated. Hydrogen, oxygen, nitrogen, methane and carbon monoxide were completely separated on the acid treated Itaya zeolite column, but not on the natural Nakano or its acid treated zeolite column.

Original languageEnglish
Pages (from-to)1496-1500
Number of pages5
JournalJournal of the Society of Materials Science, Japan
Issue number446
Publication statusPublished - 1990 Jan 1
Externally publishedYes


  • Acid treatment
  • Heat of adsorption
  • Natural zeolite
  • Separation of gas
  • Sorption

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


Dive into the research topics of 'Acid Treated Natural Zeolites and their Characteristics'. Together they form a unique fingerprint.

Cite this