CAJ | 학술논문

文章以凹凸棒石-活性炭（PG-AC ）复合材料为载体，采用等体积浸渍法制备了一系列锰氧化物负载型催化剂（MnOx/PG-AC）用于低温烟气选择性催化还原（SCR）脱硝。对比以硝酸锰（MN）、醋酸锰（MA）2种活性组分前驱体物种制备的催化剂的SCR脱硝活性，探讨前驱体物种对催化剂低温脱硝活性的影响；采用N2-BET、XRD、XPS、FESEM等表征方法对催化剂结构特性进行表征。结果表明：以硝酸锰为前驱体制备的催化剂表现出较好的低温脱硝性能，在200℃条件下，NO转化率可达92％，而以醋酸锰为前驱体制备的催化剂在相同条件下仅为75％；BET分析结果表明，以硝酸锰为前驱体所制备催化剂的BET比表面积略高于醋酸锰；而XPS结果则显示两者的表面M n原子浓度相近，但在300℃条件下，前者的表面锰氧化物的形态主要是M n2 O3，后者的表面锰氧化物为M nO ；前驱体物种的不同可直接导致表面活性物种的形态差异，表面锰氧化物以M n2 O3的存在相比于M nO更具SCR活性。
문장이요철봉석-활성탄（PG-AC ）복합재료위재체，채용등체적침지법제비료일계렬맹양화물부재형최화제（MnOx/PG-AC）용우저온연기선택성최화환원（SCR）탈초。대비이초산맹（MN）、작산맹（MA）2충활성조분전구체물충제비적최화제적SCR탈초활성，탐토전구체물충대최화제저온탈초활성적영향；채용N2-BET、XRD、XPS、FESEM등표정방법대최화제결구특성진행표정。결과표명：이초산맹위전구체제비적최화제표현출교호적저온탈초성능，재200℃조건하，NO전화솔가체92％，이이작산맹위전구체제비적최화제재상동조건하부위75％；BET분석결과표명，이초산맹위전구체소제비최화제적BET비표면적략고우작산맹；이XPS결과칙현시량자적표면M n원자농도상근，단재300℃조건하，전자적표면맹양화물적형태주요시M n2 O3，후자적표면맹양화물위M nO ；전구체물충적불동가직접도치표면활성물충적형태차이，표면맹양화물이M n2 O3적존재상비우M nO경구SCR활성。
Taking the palygorskite-activated carbon(PG-AC) as the carrier ,and by using incipient wet-ness impregnation method ,manganese oxides supported on the PG-AC catalysts were prepared from two different precursors ,manganese nitrate(MN) and manganese acetate(MA) ,and the effect of pre-cursors on low-temperature deNOx activity was further investigated .All the samples were character-ized by means of N2-BET ,XRD ,XPS and FESEM techniques .The results reveal that the low-tem-perature activity of MnOx/PG-AC using MN as precursor is superior to that of MA precursor .The NO conversion of Mn8/PG-AC/MN can reach up to 92% at 200 ℃ ,however ,at the same condition , that of Mn8/PG-AC/MA can reach up to 75% .The results of BET analysis indicate that the specific surface area of M n8/PG-AC/M N is larger than that of M n8/PG-AC/M A .In the view of the results of XRD and XPS ,MnOx/PG-AC catalyst from the MN precursor at 300 ℃ results mainly in Mn2O3 , however ,MnOx/PG-AC from the MA precursor exists primarily in MnO .Meanwhile ,the surface a-tomic concentration of Mn obtained from two different precursors are similar .Consequently , the higher low-temperature activity over MnOx/PG-AC catalyst from the MN is attributed to different ac-tive components ,the specific surface area as well as the structure of carrier .