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http://dx.doi.org/10.14478/ace.2014.1133

Catalytic Decomposition of NF3 by Thermal Decomposition and Hydrolysis of γ-Al2O3  

Kim, Yong Sul (School of Chemical Engineering, Yeungnam University)
Park, No-Kuk (School of Chemical Engineering, Yeungnam University)
Lee, Tae Jin (School of Chemical Engineering, Yeungnam University)
Publication Information
Applied Chemistry for Engineering / v.26, no.2, 2015 , pp. 154-158 More about this Journal
Abstract
In this study, the catalytic activity of ${\gamma}-Al_2O_3$ was investigated for the decomposition of $NF_3$. Reactions for $NF_3$ decomposition were carried out in the range of reaction temperature of $330{\sim}730^{\circ}C$ and GHSV of $3,000{\sim}15,000mL/g-cat{\cdot}h$ in a fixed-bed catalytic reactor system. Thermal decomposition of $NF_3$ was also performed in order to compare with the catalytic decomposition of $NF_3$. The conversion of $NF_3$ by the catalytic decomposition at $400^{\circ}C$ was four times higher than that of the thermal decomposition. It was confirmed that the reaction behavior of $NF_3$ over ${\gamma}-Al_2O_3$ exhibited two reaction pathways in the presence of steam. Fluorine in $NF_3$ over ${\gamma}-Al_2O_3$ was chemically absorbed to $AlF_3$ by the gas-solid reaction in the absence of steam. The catalytic decomposition of $NF_3$ occurred by hydrolysis with steam. It was also confirmed by FT-IR analysis that $NF_3$ was completely decomposed to NOx and HF above $500^{\circ}C$.
Keywords
Hydrolysis of $NF_3$; ${\gamma}-Al_2O_3$; $AlF_3$;
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