V_2O_5-沸石-活性炭-凹土脱硝催化剂的研制及脱硝性能

Preparation and Catalytic Properties of V_2O_5-Zeolite-Activated Carbon-Palygorskite Composite Denitration Catalyst

稻壳炭化后添加碱液和铝源分别合成了A型、A+X型和X型沸石-活性炭复合材料,加入凹凸棒石黏土成型,采用浸渍法负载V2O5制备V2O5-沸石-活性炭-凹土复合脱硝催化剂。采用XRD、SEM、N2吸附和EDX对样品进行表征,考察载体类型、V2O5含量和反应温度对催化剂低温脱硝活性的影响。结果表明,二元载体和V2O5协同催化脱硝,其脱硝率高于纯凹土制备的脱硝催化剂。催化剂脱硝活性随V2O5含量的增加而降低。反应温度越高,催化剂脱硝活性越高,最佳的反应温度为250℃,温度大于280℃后活性炭被氧化。

Zeolite （ A and X）-activated carbon was prepared by carbonization using rice husk as a raw materi-al, followed by hydrothermal treatment after adding NaOH and NaAlO2 .V2 O5 -zeolite-activated carbon-pa-lygorskite composite denitration catalyst （ V2 O5 -Z-C-PAL） was prepared by mixing zolite-activated car-bon, palygorskite （ PAL） and ammonium metavanadate through an impregnation method.The samples were characterized by XRD, SEM, EDX, N2 adsorption methods.The effects of the support, reaction temperature and content of V2 O5 on the catalytic properties of the denitration catalysts were investigated.The results indica-ted that zeolite-activated carbon could increase the porosity of the support.The NO conversion of V2 O5 -Z-C-PAL was higher than that of V2 O5 -PAL denitration catalyst for the synergistic effect of two supporters and V2 O5 .The catalytic activity of V2 O5 -Z-C-PAL decreased with the V2 O5 content and increased with reaction temperature.Activated carbon in the catalyst could be oxidized at high reaction temperature （280℃） .A proper reaction temperature was 250℃.