V-Mo/TiO2堇青石负载型脱硝催化剂的制备和性能

PREPARATION AND PROPERTIES OF V-Mo/TiO2 CORDIERITE SUPPORTED DENITRATION CATALYST

随着环境问题日益突出,锅炉烟气中氮氧化物(NO x)的脱除成为亟待解决的问题。采用同步浸渍法制备了堇青石蜂窝负载型脱硝催化剂,研究了钒含量、温度、气时空速以及酸处理等对堇青石负载型脱硝催化剂脱硝效率的影响,同时采用BET、XRD等对催化剂进行物理化学表征。结果表明:负载型脱硝催化剂脱硝效率随着V2O5含量的增加逐渐变大,脱硝效率随着温度提高先增加后降低;在340℃时,负载型催化剂达到较好的脱硝效果,脱硝效率达到98%以上(气时空速为18000 h^-1);硫酸处理后的催化剂脱硝效率提高1~3百分点,而HCl处理后的催化剂脱硝效率降低4~8百分点;堇青石负载型催化剂负载率维持在25%左右,经过超声处理后的脱落率<10%。

With the increasing environmental problems,the removal of nitrogen oxides(NO x)in flue gas has become an urgent problem.In this paper,the cordierite honeycomb-supported denitration catalyst was prepared by simultaneous impregnation method.The effects of vanadium content,temperature,gas hourly space velocity and acid treatment on the denitration efficiency of cordierite-supported denitration catalyst were studied.At the same time,the catalyst was subjected to physical and chemical characterization by means including BET and XRD.The results showed that the supported denitration catalyst could achieve good denitration effect,the denitration efficiency gradually increased with the increase of V 2O 5 content,as the temperature rose,the efficiency increased first and then decreased;at 340℃,the supported catalyst achieved the best denitration effect,the denitration efficiency was above 98%(the gas hourly space velocity was 18000 h^-1);the de-NOx efficiency of sulfuric acid treated catalyst increased by 1~3 percents,while that of hydrochloric acid treated catalyst decreased by 4~8 percents;the loading rate of the supported catalyst was maintained at about 25%,and the shedding rate after ultrasonic treatment was less than 10%.