氧化锰矿渣改性制备SCR脱硝催化剂  

Modification of manganese slag and preparation for SCR catalysts

作　　者：杜军[1] 李国云[1] 刘仁龙[1] 邬旭宏[1] 刘作华[1] 陶长元[1] 

机构地区：[1]重庆大学化学化工学院,重庆市400044

出　　处：《环境工程学报》2012年第10期3762-3766,共5页Chinese Journal of Environmental Engineering

摘　　要：以锰酸钾生产过程中产生的氧化锰矿渣为原料,制备了一系列Mn基SCR脱硝催化剂。研究了活性炭、二氧化钛、以及含锰量的变化对催化剂的脱硝活性的影响。结果表明,直接由矿渣制备的催化剂和添加活性炭、二氧化钛制备的催化剂,其最大脱硝率分别为40%和78%。XPS表征发现催化剂中的锰元素存在多种氧化价态,活性炭的加入在一定程度上改变了不同价态之间的相对含量;在矿渣中加入硫酸锰后,发现总锰含量达到10%时,催化剂的最大脱硝率从78%降低至57%,XRD测试发现硫酸锰的加入导致S2O27-物种的生成,可能是引起催化剂活性下降的原因之一;而加入醋酸锰至总锰含量达到10%时,增大了催化剂的活性温度窗口,当总锰含量达到20%时,在空速10 000 h-1条件下,催化剂的最大脱硝率达到86.7%。The manganese oxide slag formed in the industrial production of potassium manganate was applied for the preparation of SCR catalyst.The slag was modified by introducing active carbon（AC）,titania,and different precursor compounds of manganese.With the simulated flue gas,the catalytic activities were evaluated in a fixed flow tube reactor.The DeNOx of the catalyst made from the original slag and the slag modified by AC and titania was 40% and 78%,respectively.XPS measurement reveals different oxidation state of manganese.As the total amount of Mn increased to 10% by introducing MnSO4,the DeNOx decreased from 78% to 57%.XRD results indicated the existing of S2O2-7species,which suggested one of the reasons for decrease of catalytic activity.The adding of Mn（CH3COO）2 promoted the catalytic performances by widening catalytic active temperature window when total amount of Mn was 10%,and the maximum DeNOx reached 86.7% with Mn content of 20% under the space velocity of 10 000 h-1.

关 键 词：矿渣 氮氧化物 锰氧化物 SCR脱硝 

分 类 号：X511[环境科学与工程—环境工程]