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- Title
Microporosity and CO<sub>2</sub> Capture Properties of Amorphous Silicon Oxynitride Derived from Novel Polyalkoxysilsesquiazanes.
- Authors
Iwase, Yoshiaki; Horie, Yoji; Honda, Sawao; Daiko, Yusuke; Iwamoto, Yuji
- Abstract
Polyalkoxysilsesquiazanes ([ROSi(NH)1.5]n, ROSZ, R = Et, nPr, iPr, nBu, sBu, nHex, sHex, cHex, decahydronaphthyl (DHNp)) were synthesized by ammonolysis at -78 °C of alkoxytrichlorosilane (ROSiCl3), which was isolated by distillation as a reaction product of SiCl4 and ROH. The simultaneous thermogravimetric and mass spectrometry analyses of the ROSZs under helium revealed a common decomposition reaction, the cleavage of the oxygen--carbon bond of the RO group to evolve alkene as a main gaseous species formed in-situ, leading to the formation of microporous amorphous Si--O--N at 550 °C to 800 °C. The microporosity in terms of the peak of the pore size distribution curve located within the micropore size range (<2 nm) and the total micropore volume, as well as the specific surface area (SSA) of the Si--O--N, increased consistently with the molecular size estimated for the alkene formed in-situ during the pyrolysis. The CO2 capture capacity at 0 °C of the Si--O--N material increased consistently with its SSA, and an excellent CO2 capture capacity of 3.9 mmol⋅g-1 at 0 °C and CO2 1 atm was achieved for the Si--O--N derived from DHNpOSZ having an SSA of 750 m²⋅g-1. The CO2 capture properties were further discussed based on their temperature dependency, and a surface functional group of the Si--O--N formed in-situ during the polymer/ceramics thermal conversion.
- Subjects
MICROPOROSITY; CARBON sequestration; AMORPHOUS silicon; THERMOGRAVIMETRY; SILICON oxynitride; AMMONOLYSIS
- Publication
Materials (1996-1944), 2018, Vol 11, Issue 3, p422
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma11030422