化学气相沉积制备V_2O_5-WO_3/TiO_2催化剂及表征

Preparation and characterization of V_2O_5-WO_3/TiO_2 catalyst by chemical vapor deposition

以蜂窝堇青石为基体,采用化学气相沉积技术结合浸渍工艺制备出V2O5-WO3/TiO2脱硝催化剂,通过SEM、BET、XRD和EDS完成载体以及催化剂微观结构和成分表征,并利用活性评价装置测试了催化剂NO脱出率。试验结果表明,化学气相沉积技术制备的载体表面为锐钛矿型TiO2,其颗粒聚集成团块状,BET为62.73m2/g,平均孔径为9.8nm。制备的V2O5-WO3/TiO2催化剂孔结构规律与TiO2载体相似,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<100nm;在350℃、4000h-1、n(NH3)/n(NO)=1时,催化剂NO脱出率ηNO达到96.7%。

The V2O5-WO3/TiO2 catalyst was prepared,supported on honeycomb cordierite by chemical vapor deposition（CVD） and impregnation,the microstructure and component of TiO2 carrier and catalyst were characterized by means of SEM,BET,XRD and EDS.Its NO removal rate（ηNO）was tested by performance evaluation set-up.The results show that,the main phase of TiO2 carrier made by CVD is anatase TiO2,which is agglomerate.The BET surface area of TiO2 carrier is 62.73m^2/g,and its average pore diameter is 9.8nm.The pore structure of V2O5-WO3/TiO2 catalyst is similar to TiO2 carrier.The V2O5 exists in the amorphous state and is monolayer dispersion on TiO2 carrier.A small proportion of V2O5 is acicular in the micro-district and the width dimension is less than 100nm.NO removal rate（ηNO）of V2O5-WO3/TiO2 catalyst is up to 96.7% at 350℃,Sv=4000h^-1,n（NH3）/n（NO）=1.