摘要
用共沉淀法制备用于脱除NO的六铝酸盐催化剂LaMxAl12-xO19(M=Cu,Ce,CuCe)。用XRD、H2-TPR和BET对催化剂进行了结构和物性表征。用微型催化反应装置考察了催化剂在CO选择性催化还原NO中的活性。结果表明,Cu离子易于进入六铝酸盐晶格内,形成完整的六铝酸盐结构。Ce离子不易于进入六铝酸盐晶格内,主要以CeO2的形式存在。在CO+NO条件下,3种催化剂都表现出较好的脱硝活性,LaCuCeAl10O19中由于Cu离子与Ce离子间产生协同作用,该催化剂的脱硝活性有所增加。加入SO2后,3种催化剂都有不同程度的失活现象发生,其中LaCuAl11O19催化剂受SO2中毒影响最严重,LaCuCeAl10O19催化剂的脱硝活性在三者中最好。
Hexaaluminate catalysts LaMxAl12-xO19 （M = Cu, Ce, CuCe） for NO removal were prepared by the co-precipitation method. The catalysts were characterized by the means of XRD, H2-TPR and BET. The cat- alyst efficiency for selective catalytic reduction of NO by CO was evaluated in a catalytic microreactor. The re- sults show that Cu ions can easily enter the hexaaluminate crystal lattice to form a good hexaaluminate phase. Ce ions are hard to enter hexaaluminate skeleton, exist mainly in the form of CeO2. Under the condition of CO ＋ NO, all of the three catalysts have a good denitrification activity. Due to the synergistic effect between Cu ions and Ce ions, catalyst LaCuCeAl10O19 has a better denitrification activity. With the introduction of SO2, the deni- trification activities of all the three catalysts decline to different levels. Catalyst LaCuAl10O19 is poisoned by SO2 most seriously, while catalyst LaCuCeAl10O19 has the best denitrification activity among them.
出处
《环境工程学报》
CAS
CSCD
北大核心
2013年第1期283-288,共6页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(21076025)
