Open AccessProcessing of C{sub 3}H{sub 7}OH, C{sub 2}HCl{sub 3} and CCl{sub 4} in flue gases using silent discharge plasmas, enhanced by (V)UV at 172 nm and 253.7 nm
Author(s) -
Zoran Falkenstein,
J.J. Coogan
Publication year - 1996
Language(s) - English
Resource type - Reports
DOI - 10.2172/279702
Subject(s) - dielectric barrier discharge , ozone , chemistry , irradiation , singlet oxygen , analytical chemistry (journal) , oxygen , flue gas , phosgene , photochemistry , plasma , environmental chemistry , electrode , organic chemistry , physics , nuclear physics , quantum mechanics
We present experimental results on (V)LTV enhanced, barrier discharge processing of trichloroethylene (C{sub 2}HCl{sub 3}) and carbon tetrachloride (CCl{sub 4}) in dry and humid air. The contaminated air streams are treated by using a combination of barrier discharges, UV (253.7nm) from a commercial low pressure mercury lamp and VUV from an in-house Xe-excimer source (172nm) driven by a dielectric barrier discharge. Removal efficiencies for both excitation of the contaminated air by the barrier discharge and VUV at 172 nm will be compared with a combined treatment of discharge and irradiation at 253.7 nm and 172 nm. Significant photo-chemical effects include improved generation of both atomic and molecular singlet oxygen from the absorption of ozone in the Hartley band and VUV-regions, and for (V)UV irradiation, direct photolysis of molecular oxygen, water and the pollutant itself. The application of (V)UV irradiation has a substantial effect on final concentrations of the long lived byproducts phosgene and DCAC