Physical properties and pyrolysis characteristics of rice husks in different atmosphere
| Autor: | Jiang-xian Chen, Xin-sheng Wang, Zhen-lin Lu, Lei Jia |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Thermal properties
Materials science Silicon General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Activation energy Physics and Astronomy(all) 010402 general chemistry Combustion 01 natural sciences Husk Rice husk XPS Thermal analysis Graphite Microstructure Argon 021001 nanoscience & nanotechnology lcsh:QC1-999 0104 chemical sciences chemistry Chemical engineering 0210 nano-technology Pyrolysis Carbon lcsh:Physics |
| Zdroj: | Results in Physics, Vol 6, Iss, Pp 866-868 (2016) |
| ISSN: | 2211-3797 |
| DOI: | 10.1016/j.rinp.2016.09.011 |
| Popis: | This paper explores the physical properties and pyrolysis characteristics of rice husk combustion in air and in argon. The SEM results show that the outer epidermis of combusted RHIR (rice husk in air) is well organized with features that include papillae shapes and full, straight, high ridges. The inner epidermis of the RHIR has long rectangular furrow tissues. The results also show that the outer epidermis of pyrolyzed RHR (rice husk in argon) has ridges that are not as straight as for the RHIR and the top of the papillae have small holes. The inner surface of the RHR looks a some cracked. XPS analysis shows that the surfaces of RHIR and RHR contain carbon, oxygen, and silicon. The carbon was found to be in the elemental graphite form, the oxygen in the −2 oxidation state, and the silicon in the Si4+ form as SiO2. The DSC graphs have “camel peaks”, showing that an increase in rate of heating leads to an increase in the exothermic peaks. Calculations show that, initially, increased temperature leads to increased activation energy for pyrolysis, but as the temperature continues to increase, the activation energy decreases again. The frequency factor follows the same trend. In analysis of carbon content, rice husk volatile carbon content is the largest, it is about 33.94%, especially 700 °C, the carbon content of volatile minimum is about 0.33%. Keywords: Rice husk, Microstructure, Thermal analysis, Thermal properties, XPS |
| Databáze: | OpenAIRE |
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