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首页> 外文期刊>Environmental Science & Technology >PCDD/F Adsorption and Destruction in the Flue Gas Streams of MWI and MSP via Cu and Fe Catalysts Supported on Carbon
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PCDD/F Adsorption and Destruction in the Flue Gas Streams of MWI and MSP via Cu and Fe Catalysts Supported on Carbon

机译：碳载铜和铁催化剂对MWI和MSP烟气中PCDD / F的吸附和破坏

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Catalytic destruction has been applied to control polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/Fs) emissions from different facilities. The cost of carbon-based catalysts is considerably lower than that of the metal oxide or zeolite-based catalysts used in the selective catalytic reduction (SCR) system. In this study, destruction and adsorption efficiencies of PCDD/Fs achieved with Cu/C and Fe/C catalysts from flue gas streams of a metal smelting plant (MSP) and a large-scale municipal waste incinerator (MWI), respectively, are evaluated via the pilot-scale catalytic reactor system (PCRS). The results indicate that Cu and Fe catalysts supported on carbon surface are capable of decomposing and adsorbing PCDD/ Fs from gas streams. In the testing sources of MSP and MWI, the PCDD/F removal efficiencies achieved with Cu/C catalyst at 250 ℃ reach 96%, however, the destruction efficiencies are negative (-1,390% and -112%, respectively) due to significant PCDD/F formation on catalyst promoted by copper. In addition, Fe/C catalyst is of higher removal and destruction efficiencies compared with Cu/C catalyst in both testing sources. The removal efficiencies of PCDD/Fs achieved with Fe/C catalyst are 97 and 94% for MSP and MWI, respectively, whereas the destruction efficiencies are both higher than 70%. Decrease of PCDD/F destruction efficiency and increase of adsorption efficiency with increasing chlorination of dioxin congeners is also observed in the test via three-layer Fe/C catalyst. Furthermore, the mass of 2,3,7,8-PCDD/Fs retained on catalyst decreases on the order of first to third layer of catalyst. Each gram Fe/C catalyst in first layer adsorbs 10.9, 6.91, and 3.04 ng 2,3,7,8-PCDD/Fs in 100 min testing duration as the operating temperature is controlled at 150, 200, and 250 ℃, respectively.
机译：催化销毁已应用于控制来自不同设施的多氯二苯并对二恶英和二苯并呋喃（PCDD / Fs）的排放。碳基催化剂的成本大大低于选择性催化还原（SCR）系统中使用的金属氧化物或沸石基催化剂的成本。在这项研究中，分别评估了金属冶炼厂（MSP）和大型市政垃圾焚化炉（MWI）的烟气流中使用Cu / C和Fe / C催化剂实现的PCDD / Fs的破坏和吸附效率。通过中试催化反应器系统（PCRS）。结果表明，负载在碳表面上的Cu和Fe催化剂能够分解和吸附气流中的PCDD / Fs。在MSP和MWI的测试源中，使用Cu / C催化剂在250℃时达到的PCDD / F去除效率达到96％，但是由于PCDD含量较高，其破坏效率为负（分别为-1,390％和-112％）。在铜促进下的催化剂上形成/ F。此外，在两个测试源中，Fe / C催化剂的去除和破坏效率均高于Cu / C催化剂。 Fe / C催化剂对MSP和MWI的PCDD / Fs去除效率分别为97％和94％，而破坏效率均高于70％。通过三层Fe / C催化剂在试验中还观察到PCDD / F破坏效率的降低和二恶英同类物氯化程度的增加的吸附效率的提高。此外，保留在催化剂上的2,3,7,8-PCDD / Fs的质量按催化剂第一层至第三层的顺序降低。由于工作温度分别控制在150、200和250℃，第一层中的每克Fe / C催化剂在100分钟的测试时间内吸附了10.9、6.91和3.04 ng 2,3,7,8-PCDD / Fs。

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