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Kinetics of Si_3N_4 Formation from Rice Hull

Li Ying Liu Lingqing Dou Shixue (Department of Chemistry,Northeast University of Technology)  
Coking the green rice hull can give silica and carbon,and this silica can reactwith N_2 at a certain temperature to produce Si_3N_4.In this paper,the kinetic prob-lem in preparing Si_3N_4 from rice hulls was investigated by means of thermogravime-tric analysis.Experimental results indicate that the reaction rate controlling steps inthe overall process are the diffusion of SiO gas and/or CO gas through the stagnantgas film around the carbon particle,the activation energy is less than 41.868 kJ/mole.Adding some Fe_O_3 and NaF as catalyst to the rice hulls can increase the nitri-ding percent.The optimum amount of Fe_2O_3 and NaF added to rice hulls are 0.224wt% and 0.1 mo1% respectively.The catalytic action of NaF is better than Fe_2O_3.
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