过渡金属改性钒钨钛催化剂的制备及脱硝性能研究  

Study on preparation and denitrification performance of transition metal modified V_(2)O_(5)-WO_(3)/TiO_(2) catalyst

作　　者：孙权 秦云 胡杰 张勇 黄鑫怡 徐兵 SUN Quan;QIN Yun;HU Jie;ZHANG Yong;HUANG Xinyi;XU Bing(Wuhan Huabai Environmental Protection Technology Co.,Ltd.,Wuhan Hubei 430080,China;不详)

机构地区：[1]武汉华柏环保科技有限公司,湖北武汉430080 [2]武汉钢铁有限公司,湖北武汉430080 [3]武汉轻工大学化学与环境工程学院,湖北武汉430023

出　　处：《工业安全与环保》2024年第8期77-81,共5页Industrial Safety and Environmental Protection

基　　金：湖北省教育厅科学研究计划重点项目(D20201602);武汉市企业技术创新专项(2020010602012065)。

摘　　要：采用化学气相沉积法对浸渍法制备的V_(2)O_(5)-WO_(3)/TiO_(2) 催化剂进行过渡金属改性,考察Cu、Mn、Cr等过渡金属对催化剂脱硝性能的影响,确定最优的过渡金属,并考察过渡金属负载量对脱硝性能的影响。结果表明:Cr改性V_(2)O_(5)-WO_(3)/TiO_(2) 催化剂的催化性能最佳,催化剂活性温度区间由280~340℃降至250~310℃,提高了催化剂的低温脱硝活性。对催化剂进行XRD和SEM表征分析,CuO_(x)、Mn O_(x)、CrO_(x)等金属氧化物高度分散于试样的表面,对催化剂的结晶形态无明显的影响。1%Cr与5%Cr负载量改性的催化剂粒径尺寸小,几乎没有出现颗粒集聚现象,表面相对平整光滑,分布比较均匀,提高了NH_(3)-SCR的活性。其中1%C_(r)-V_(2)O_(5)-WO_(3)/TiO_(2) 催化剂在280℃时,NO_(x)转化率达到97.51%,显著提高催化剂低温脱硝性能。V_(2)O_(5)-WO_(3)/TiO_(2) catalyst was prepared by impregnation method,the transition metals including Cu,Mn and Cr were used to modify the V_(2)O_(5)-WO_(3)/TiO_(2) catalyst by chemical vapor deposition. The optimal transition metal and transition metal load on the denitrification performance were investigated. Among the three modified catalysts, Cr-V_(2)O_(5)-WO_(3)/TiO_(2) catalyst had the best denitrification performance,and the activity temperature range of catalyst de creased from 280 ~ 340 ℃ to 250 ~ 310 ℃,which improved the denitrification performance at low temperature. The physicochemical properties of catalysts were studied by X-ray powder diffraction (XRD) and scanning electron microscope(SEM). The result showed that CuO_(x),MnO_(x),CrO_(x) and other metal oxides are highly dispersed on the sur face of the sample,and have no obvious effect on the crystal morphology of the catalyst. The particle size of 1%Cr and 5%Cr droped catalysts is smaller than that of 3%Cr droped catalysts. The modified catalysts barely had particle ag glomeration,the catalysts were smooth and evenly distributed,which improved the activity of NH3-SCR. When 1%Cr V_(2)O_(5)-WO_(3)/TiO_(2) catalyst was used at 280 ℃,the NO_(x) conversion rate reached 97.51%,significantly improved the low temperature denitrification performance.

关 键 词：钒钨钛催化剂 过渡金属 化学气相沉积 脱硝性能 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]