Synthesis of SAPO-18 with low acidic strength and its application in conversion of dimethylether to olefins

Yuichiro Hirota, Mayuka Yamada, Yoshiaki Uchida, Yasuhiro Sakamoto, Toshiyuki Yokoi, Norikazu Nishiyama

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

SAPO-18 molecular sieve was synthesized by a dry gel conversion (DGC) and hydrothermal (HT) synthesis methods using methyltriethoxysilane as the only Si source (DGC-Me-SAPO-18 and HT-Me-SAPO-18). Their physicochemical and catalytic properties on dimethylether-to-olefin (DTO) reaction were compared with those of conventional SAPO-18 molecular sieves synthesized by a hydrothermal synthesis method (HT-SAPO-18). An NH3-TPD measurement revealed that the desorption peak position of Brønsted acid of the Me-SAPO-18 samples moved to lower temperature, indicating that Brønsted acidic strength of the Me-SAPO-18 samples was lower than that of the HT-SAPO-18 samples. The DME conversions and yields of light olefins over DGC-Me-SAPO-18 decreased at a slower rate than those of HT-SAPO-18. The decreased acidic strength and flake-like morphology of DGC-Me-SAPO-18 could retard the coke formation, leading to the prolonged catalytic lifetime.

Original languageEnglish
Pages (from-to)65-69
Number of pages5
JournalMicroporous and Mesoporous Materials
Volume232
DOIs
Publication statusPublished - 2016 Sep 15

Keywords

  • Brønsted acid strength
  • Dimethylether-to-olefin (DTO) reaction
  • Dry gel conversion
  • SAPO-18

ASJC Scopus subject areas

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

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