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Characterization of the gas releasing behaviors of catalytic pyrolysis of rice husk using potassium over a micro-fluidized bed reactor
- Source :
- Energy Conversion and Management. 136:395-403
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Influence of potassium on the gas releasing behaviors during rice husk high-temperature pyrolysis was investigated under isothermal conditions in a two stage micro-fluidized bed reactor. Reaction kinetics for generating H2, CO, CO2 and CH4 was investigated based on the Friedman and model-fitting approaches. Results indicated that different gas species had different times to start and end the gas release process, particularly at 600 °C, representing different chemical routes and mechanics for generating these gas components. The resulting apparent activation energies for H2, CO, and CO2 decreased from 23.10 to 12.00 kJ/mol, 15.48 to 14.03 kJ/mol and 10.14 to 7.61 kJ/mol respectively with an increase in potassium concentration from 0 to 0.5 mol/kg, while that for CH4 increased from 16.85 to 19.40 kJ/mol. The results indicated that the addition of potassium could promote the generation reactions of H2, CO and CO2 while hinder the generation reactions of CH4. The pyrolysis reaction was further found to be subject to the three-dimensional diffusion model for all the samples.
- Subjects :
- Renewable Energy, Sustainability and the Environment
Chemistry
020209 energy
Potassium
Kinetics
Energy Engineering and Power Technology
Biomass
chemistry.chemical_element
02 engineering and technology
021001 nanoscience & nanotechnology
Husk
Isothermal process
Chemical kinetics
Fuel Technology
Nuclear Energy and Engineering
Chemical engineering
Fluidized bed
0202 electrical engineering, electronic engineering, information engineering
Organic chemistry
0210 nano-technology
Pyrolysis
Subjects
Details
- ISSN :
- 01968904
- Volume :
- 136
- Database :
- OpenAIRE
- Journal :
- Energy Conversion and Management
- Accession number :
- edsair.doi...........9079f0b5a9b8e01c79e2f4c8ceae87a5