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Effect of packing materials on the decomposition of tetrafluoroethane in a packed-bed dielectric barrier discharge plasma reactor
Gandhi, M.S. & Mok, Y.S.
Abstract
The performance of 1,1,1,2-tetrafluoroethane or
HFC-134a decomposition and the formation of byproducts
in a dielectric barrier discharge plasma reactor were studied
with different packing systems such as α-Al2O3 (porous
and nonporous), γ-Al2O3 (porous) and ZrO2 (nonporous).
Experimental variables such as reactor temperature, initial
HFC-134a concentration and oxygen levels were chosen
for the performance analysis. Among the packing systems,
the porous γ-Al2O3 and α-Al2O3 decomposed HFC-134a
much more effectively than the nonporous α-Al2O3 and
ZrO2. The combination of the plasma with the porous γ-
Al2O3 was found to cover a wide range of initial concentration.
The decomposition efficiency tended to increase
with the addition of oxygen up to 2 %, but further increase
in the oxygen led to a decrease. As well as carbon oxides
(CO2 and CO), significant amounts of unwanted byproducts
such as COF2 and CF4 were also identified in the
effluent gas with the nonporous α-Al2O3 and ZrO2. On the
contrary, with the porous γ-Al2O3 and α-Al2O3, such
unwanted byproducts were considerably suppressed,
enhancing the formation of CO2 and CO.
Keywords
1,1,1,2-Tetrafluoroethane; Catalysis; Dielectric barrier discharge; Packing materials; Plasma
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