Synthesis and crystal structure analysis of a novel microporous barium-containing silicate AES-20

• Published in: Microporous and mesoporous materials Vol. 243; pp. 239 - 246
• Main Authors: Yamamoto, Katsutoshi, Ikeda, Takuji, Ideta, Chiaki, Watanabe, Koji, Nakaoka, Takuma
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.05.2017
• Subjects: Barium-containing silicate; Layered silicate; Microporous; X-ray structure analysis; Barium-containing silicate; Layered silicate; X-ray structure analysis; Microporous
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2017.02.034

A novel microporous barium-containing silicate AES-20 was successfully synthesized, and its crystal structure was determined based on the ab-initio structure analysis from powder X-ray diffraction data. AES-20 was composed of unique silicate layers having 8- and 5-rings and interlayer barium atoms pillaring the silicate layers. AES-20 was obtained through the hydrothermal synthesis in the presence of lithium cations, which were involved in AES-20 as extra-framework species. The 8-ring micropore in AES-20 is smaller than a nitrogen molecule but larger than a carbon dioxide molecule, suggesting the application to a size-selective adsorbent for carbon dioxide removal. [Display omitted] •A novel microporous barium-containing silicate AES-20 was successfully synthesized.•The crystal structure of AES-20 was determined based on the ab-initio structure analysis of powder X-ray diffraction data.•AES-20 was composed of unique silicate layers having 8- and 5-rings and interlayer barium atoms pillaring the silicate layers.•AES-20 having 8-ring micropores whose opening is smaller than nitrogen but larger than carbon dioxide could be applied to a size-selective adsorbent for carbon dioxide removal.