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采用超声波浸渍法、传统浸渍法制备一系列V2O5-WO3/TiO2催化剂,对催化剂的反应活性进行考察。研究表明:与普通浸渍法相比,超声波浸渍法可以提高催化剂的脱硝效率,拓宽催化反应的温度窗口。超声波浸渍时间和超声波功率对催化剂的反应活性有较大影响。浸渍时间增加,催化剂脱硝效率也随之提高。超声波功率增加,催化剂的脱硝效率先提高后降低。在超声波频率28 kHz,超声波功率400 W,超声作用时间1.5 h,超声水粉比为100 mL H2O/10 g TiO2的条件下,制得的V2O5-WO3/TiO2脱硝催化剂脱硝效率接近100%。通过SEM对制备的催化剂进行表征,超声波浸渍法制备的催化剂的活性成分在载体上分散更加均匀。
A series of V2O5-WO3 / TiO2 catalysts were prepared by ultrasonic impregnation and conventional impregnation method. The reactivity of the catalyst was investigated. The results show that compared with ordinary impregnation method, ultrasonic impregnation method can improve the denitration efficiency of catalyst and broaden the temperature window of catalytic reaction. Ultrasonic immersion time and ultrasonic power have great influence on the reactivity of the catalyst. Impregnation time increases, the catalyst denitrification efficiency also increases. Ultrasonic power increases, the denitrification efficiency of the catalyst first increases and then decreases. Under the conditions of ultrasonic frequency of 28 kHz, ultrasonic power of 400 W, ultrasonic time of 1.5 h and ultrasonic grit ratio of 100 mL H2O / 10 g TiO2, the denitrification efficiency of V2O5-WO3 / TiO2 denitration catalyst was close to 100%. The prepared catalyst was characterized by SEM. The active components of the catalyst prepared by ultrasonic impregnation were dispersed more evenly on the carrier.