CAJ | 학술논문

采用浸渍法用ZrOCl_2·8H_2O,Mn(NO_3)_2·6H_2O和Fe(NO_3)_3·9H_2O制备了Zr-Mn-Fe/Al_2O_3复合催化剂.通过调节质量分数分别为2%,5%和10%金属元素锰和锆的负载量制备了不同的催化剂,测试了其在NH_3条件下的低温脱硝活性,研究了不同组分配比和氧气含量对催化剂脱硝性能的影响.通过在载体上分别单独负载Mn,Fe和Zr来探究脱硝过程中起主要作用的催化活性组分.实验结果表明,在体积分数φ(NO)=0.05%,摩尔比n(NH_3) : n(NO)=1 : 1和φ(O_2)=3.6%的条件下,制备的催化剂5Zr-5Mn-10Fe/Al_2O_3表现出很高的催化活性,在180℃时脱除效率超过了98%,是一种良好的低温SCR催化剂. Mn在脱硝过程中是主要的活性组分,而Zr和Fe是助催化组分.此外,在反应过程中通入一定的氧气,可以明显提高NO的脱除效率,能促进NO的转化.
채용침지법용ZrOCl_2·8H_2O,Mn(NO_3)_2·6H_2O화Fe(NO_3)_3·9H_2O제비료Zr-Mn-Fe/Al_2O_3복합최화제.통과조절질량분수분별위2%,5%화10%금속원소맹화고적부재량제비료불동적최화제,측시료기재NH_3조건하적저온탈초활성,연구료불동조분배비화양기함량대최화제탈초성능적영향.통과재재체상분별단독부재Mn,Fe화Zr래탐구탈초과정중기주요작용적최화활성조분.실험결과표명,재체적분수φ(NO)=0.05%,마이비n(NH_3) : n(NO)=1 : 1화φ(O_2)=3.6%적조건하,제비적최화제5Zr-5Mn-10Fe/Al_2O_3표현출흔고적최화활성,재180℃시탈제효솔초과료98%,시일충량호적저온SCR최화제. Mn재탈초과정중시주요적활성조분,이Zr화Fe시조최화조분.차외,재반응과정중통입일정적양기,가이명현제고NO적탈제효솔,능촉진NO적전화.
Zr-Mn-Fe/Al_2O_3 catalysts were prepared by a simple impregnation method using ZrOCl_2·8H_2O,Mn(NO_3)_2·6H_2O and Fe(NO_3)_3·9H_2O on the Al2O3 carrier. The weight fractions of loading Mn and Zr on the catalysts were individually adjusted with 2%, 5%, and 10%. These catalysts were used to investigate low temperature selective catalytic reduction of NO with ammonia. The influences of metal loading and O_2on the De-NO_x efficiency were also studied. Mn, Fe and Zr were individually loaded on Al_2O_3to ascertain the main catalytic activity component. Results show that the catalyst of 5Zr-5Mn-10Fe/Al2O3 is of higher De-NO_x efficiency in the simulated flue gas of 0.05% NO with a 1 ∶ 1 NH_3/NO molar ratio in the presence of a volume fraction of 3.6% O_2. This catalyst yields 98% NO conversion at 180℃ under the mentioned conditions and is a type of good low temperature selective catalytic reduction (SCR) catalyst. Mn is the main acting component in the process of NO removal in this catalyst, while the Zr and Fe are acting as a promoter. In addition, oxygen can significantly improve the efficiency of NO removal.