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以堇青石蜂窝陶瓷为基体,应用化学气相沉积技术(CVD)负载TiO2载体,浸渍V、W化合物溶液,制备出V2O5-WO3/TiO2脱硝催化剂.利用扫描电子显微镜(SEM)、X射线能谱仪(EDS)、X射线衍射仪(XRD)和X射线荧光光谱仪(XRF)等表征催化剂微观结构和成分,并利用自行研制的活性评价装置分析了催化剂的脱硝效率.结果表明:制备的催化剂比表面积为78.8m2/g,平均孔径为6.8 nm;锐钛型TiO2载体在堇青石基体上沉积均匀、排列紧密,V2O5在TiO2载体上无定形态单层分散,微量V2O5在微区长大成针状,宽度均小于100 nm;在350℃、空速为1000 h-1、nNH3/nNO摩尔比=1时,催化剂NO的脱除效率ηNO可达到98.3%.
Using cordierite honeycomb ceramic as substrate, V2O5-WO3 / TiO2 denitrification catalyst was prepared by chemical vapor deposition (CVD) supported TiO2 carrier and impregnated with V and W compound solution.Using scanning electron microscopy (SEM), X-ray energy dispersive spectrometer (EDS), X-ray diffraction (XRD) and X-ray fluorescence (XRF) were used to characterize the microstructure and composition of the catalyst. The denitrification efficiency of the catalyst was analyzed by a self-developed activity evaluation device. The results showed that the specific surface area Of 78.8m2 / g and an average pore size of 6.8 nm. The anatase TiO2 carrier was uniformly deposited on the cordierite substrate and closely packed. V2O5 was monolayer dispersed in amorphous state on the TiO2 carrier. The trace amount of V2O5 grew into a needle- The width of the catalyst was less than 100 nm. At 350 ℃, the space velocity was 1000 h-1, and the nNH3 / nNO molar ratio = 1, the NO removal efficiency ηNO of the catalyst reached 98.3%.