A variety of VOCs and PCDD/PCDFs (polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans) emitted from the incineration of solid waste are known to be hazardous to humans. Thus, removal of these compounds is important taste. Among the emission control technologies, catalytic deep oxidation ...
A variety of VOCs and PCDD/PCDFs (polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans) emitted from the incineration of solid waste are known to be hazardous to humans. Thus, removal of these compounds is important taste. Among the emission control technologies, catalytic deep oxidation has been widely used, because of low energy consumption and mild operation condition. The purpose of this paper is the actual spot applicable possibility of the basic laboratory scale test which is to investigate the resolution by the catalytic oxidation of VOCs, dioxin and CI-VOCs be generated by incinerator combustion. First of all, we did basic catalyst resolution reaction tests with l,2-dichlorobenzene(o-DCB) in laboratory. We chose o-DCB as a solvent because it's being discuss as precursor of dioxin and has similar structure. As the result of laboratory experiments, transition metal oxides supported by γ -Al_(2)O_(3), were investigated for the total oxidation of o-DCB according to the various reactional condition. The activity of the o-DCB oxidation was observed in the order of CrO_(x)>CuO_(x),>VO_(x)>MnO_(x),>MoO_(x). Though chromium and copper oxides exhibit the highest activity for oxidation of o-DCB, however such catalysts are not particularly suited for the destruction of chlorinated VOCs, since they may undergo deactivation due to the halide poisoning and produce PCBs, which is known to be more hazardous. Despite of their high activities, for further investigation, V205 was selected as the main catalyst component. In order to overcome catalyst deactivation, MnO_(2), MoO_(3) and Cr_(2)O_(3) were introduced to the catalyst as promoters. The V205 loading and content of promoters were optimized for best activation of catalyst. As the result, we made three honeycomb monolith catalysts(5wt.% V_(2)O_(5)/l0wt.% MoO_(3)/cordierite, 5wt.% V_(2)O_(5)/lOwt.% MoO_(3)wt.% MnO_(2)/cordierite, 5wt.% V_(2)O_(2)/lOwt.% MoO_(3)/3wt.% Cr_(2)O_(3)/cordierite) for actual spot applicable. And based on the result, we did pilot tests with working incinerators P and S to confirm the applicable possibility on the actual spot. Those catalysts made by impregnation with Wetness method. P incinerator has been used to investigate the character of catalytic oxidation about VOCs and Cl-VOCs using honeycomb monolith catalysts. And S incinerator has been used to investigate the character of resolution about dioxin and C1-VOCs which is dioxin precursor. We confirmed that the conversion of seven VOCs items(Q-pinene, β-pinene, 3-carene, azulene, tridecane, undecane-2methyl, undecane-2,4methyl), three odors item(hydrogen sulfide mercaptane, styrene), C1-VOCs items(o-dichlorobenzene, penta-chlorophenol) which are generated from the P incinerator, the actual spot incinerator, with the three kind of catalyst ,V/Mo/cordierite, V/Mo/Mn/cordierite, V/Mo/Cr/cordierite. In case of VOCs, conversion was the most stable with V/Mo/Mn/cordierite catalyst, over 95% at 300℃. In case of odor, V/Mo/Mn/cordierte catalyst indicated the most stable conversion too. The efficiency of hydrogen sulfide is from 70 % to 95% at all temperature and GHSV(gas hourly space velocity) condition. And mercaptane and styrene is about 80%. Also O-DCB and P-CP, C1-VOCs, indicated over 95% at over 25 0℃. We applied V/Mo/Mn/cordierite catalyst has been chosen by pilot test of P incinerator to the industrial waste incinerator(S incinerator). As a result of our study we confirmed that the conversion of C1-VOCs which is dioxin precursor is from 50.7% to 91.3%. It's lower than that of P incinerator but catalytic activation is from 69.6% to 85.0% in dioxin.
A variety of VOCs and PCDD/PCDFs (polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans) emitted from the incineration of solid waste are known to be hazardous to humans. Thus, removal of these compounds is important taste. Among the emission control technologies, catalytic deep oxidation has been widely used, because of low energy consumption and mild operation condition. The purpose of this paper is the actual spot applicable possibility of the basic laboratory scale test which is to investigate the resolution by the catalytic oxidation of VOCs, dioxin and CI-VOCs be generated by incinerator combustion. First of all, we did basic catalyst resolution reaction tests with l,2-dichlorobenzene(o-DCB) in laboratory. We chose o-DCB as a solvent because it's being discuss as precursor of dioxin and has similar structure. As the result of laboratory experiments, transition metal oxides supported by γ -Al_(2)O_(3), were investigated for the total oxidation of o-DCB according to the various reactional condition. The activity of the o-DCB oxidation was observed in the order of CrO_(x)>CuO_(x),>VO_(x)>MnO_(x),>MoO_(x). Though chromium and copper oxides exhibit the highest activity for oxidation of o-DCB, however such catalysts are not particularly suited for the destruction of chlorinated VOCs, since they may undergo deactivation due to the halide poisoning and produce PCBs, which is known to be more hazardous. Despite of their high activities, for further investigation, V205 was selected as the main catalyst component. In order to overcome catalyst deactivation, MnO_(2), MoO_(3) and Cr_(2)O_(3) were introduced to the catalyst as promoters. The V205 loading and content of promoters were optimized for best activation of catalyst. As the result, we made three honeycomb monolith catalysts(5wt.% V_(2)O_(5)/l0wt.% MoO_(3)/cordierite, 5wt.% V_(2)O_(5)/lOwt.% MoO_(3)wt.% MnO_(2)/cordierite, 5wt.% V_(2)O_(2)/lOwt.% MoO_(3)/3wt.% Cr_(2)O_(3)/cordierite) for actual spot applicable. And based on the result, we did pilot tests with working incinerators P and S to confirm the applicable possibility on the actual spot. Those catalysts made by impregnation with Wetness method. P incinerator has been used to investigate the character of catalytic oxidation about VOCs and Cl-VOCs using honeycomb monolith catalysts. And S incinerator has been used to investigate the character of resolution about dioxin and C1-VOCs which is dioxin precursor. We confirmed that the conversion of seven VOCs items(Q-pinene, β-pinene, 3-carene, azulene, tridecane, undecane-2methyl, undecane-2,4methyl), three odors item(hydrogen sulfide mercaptane, styrene), C1-VOCs items(o-dichlorobenzene, penta-chlorophenol) which are generated from the P incinerator, the actual spot incinerator, with the three kind of catalyst ,V/Mo/cordierite, V/Mo/Mn/cordierite, V/Mo/Cr/cordierite. In case of VOCs, conversion was the most stable with V/Mo/Mn/cordierite catalyst, over 95% at 300℃. In case of odor, V/Mo/Mn/cordierte catalyst indicated the most stable conversion too. The efficiency of hydrogen sulfide is from 70 % to 95% at all temperature and GHSV(gas hourly space velocity) condition. And mercaptane and styrene is about 80%. Also O-DCB and P-CP, C1-VOCs, indicated over 95% at over 25 0℃. We applied V/Mo/Mn/cordierite catalyst has been chosen by pilot test of P incinerator to the industrial waste incinerator(S incinerator). As a result of our study we confirmed that the conversion of C1-VOCs which is dioxin precursor is from 50.7% to 91.3%. It's lower than that of P incinerator but catalytic activation is from 69.6% to 85.0% in dioxin.
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