Conversion of dry gel to microporous crystals in gas phase

Masahiko Matsukata, Masaru Ogura, Takayuki Osaki, Poladi Raja Hari Prasad Rao, Mikihiro Nomura, Eiichi Kikuchi

Research output: Contribution to journalArticlepeer-review

272 Citations (Scopus)


Recently the dry gel conversion (DGC) technique, where a hydrogel is dried and the resultant dry gel is converted into microporous crystals in steam or in a mixed vapor of steam and organic structure-directing agents (SDAs), has been developed. It has been shown that a wide variety of microporous crystals, pure silica microporous crystals, aluminosilicates, metallosilicates, and aluminophosphates, can be synthesized using the DGC method. Remarkable results have been reported in the synthesis of BEA types zeolites, namely aluminosilicate, titaniumsilicate, zincosilicate, and borosilicate with BEA topology, using tetraethylammonium hydroxide, a commercially available SDA. It has also been found that zeolite OU-1, probably analogous to SSZ-31 and NCL-1, is formed via phase transformation from BEA. Dense zeolite coatings like membranes are possible using this method. Characteristics of the DGC method are discussed in detail.

Original languageEnglish
Pages (from-to)77-92
Number of pages16
JournalTopics in Catalysis
Issue number1-2
Publication statusPublished - 1999
Externally publishedYes


  • Beta zeolite
  • DGC method
  • Dry gel conversion
  • OU-1 zeolite
  • Zeolite synthesis

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry


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