Synthesis of novel aluminoborosilicate isomorphous to zeolite TUN and its acidic and catalytic properties

Feiyu Qin, Yong Wang, Yao Lu, Ryota Osuga, Hermann Gies, Junko N. Kondo, Toshiyuki Yokoi

Research output: Contribution to journalArticlepeer-review

Abstract

The novel TUN-type aluminoborosilicate zeolite (denoted as [Al, B]-TUN), which consists of a three-dimensional pore system with 10-ring, has been hydrothermally synthesized for the first time and implied in cracking reaction. The mother gel composition including aluminum, boron, organic structure-directing agent and sodium were intensively studied and optimized. We found for the first time that the incorporation of B together with Al T-sites into the TUN framework led to the control of acidic properties including the number, strength and distribution of acid sites. The n-hexane cracking over different catalysts show that the [Al, B]-TUN zeolites have a longer catalyst duration and a higher P/E ratio (propylene/ethylene selectivity) than [Al]-TUN. Moreover, the comparison between TUN, MFI and *BEA-type zeolites indicates that TUN-type zeolite has a preference for propylene production. The relationship between acidic properties and carking behaviors were discussed and supported by the constraint index (CI) value measurement.

Original languageEnglish
Article number111237
JournalMicroporous and Mesoporous Materials
Volume323
DOIs
Publication statusPublished - 2021 Aug

Keywords

  • Aluminoborosilicate
  • Constraint index
  • TUN-Type zeolite

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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