| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Preceramic Polymers; Synthesis, Processing, Modeling, and Derived Ceramics
|
| Presentation Title |
Novel Hydrogen Chemisorption Properties of Polymer-derived Amorphous SiAlN Compounds |
| Author(s) |
Yuji Iwamoto |
| On-Site Speaker (Planned) |
Yuji Iwamoto |
| Abstract Scope |
An amorphous compound consisting of p-block elements, namely Si, Al and N elements was synthesized by pyrolysis of an Al-modified polysilazane at 1273 K under flowing ammonia. H2-TPD measurements revealed that the unique reversible H2 adsorption and desorption properties of the polymer-derived amorphous SiAlN. The measured activation energy for H2-desorption was approximately 44 kJ/mol, which was sufficiently high to be assigned as H2 chemisorption. The reversible H2 chemisorption and desorption was successfully identified by 27Al MAS NMR spectroscopic analyses: the results strongly suggested that the local structural reorientation reversibly occurs between undetectable highly distorted Al sites and clearly detectable five-coordinate Al sites by H2 adsorption and desorption. Further study on CO2 hydrogenation on the amorphous SiAlN will be shown and the results will be discussed aiming to develop transition or noble metal-free advanced materials for clean energy applications such as advanced hydrogen production, storage and transportation systems. |