摘要
通过溶胶-凝胶法将TiO2溶胶负载在堇青石载体上,再浸渍Mn和Ce活性组分,得到整体式催化剂,并用于NH3选择性催化还原（ SCR） NOx .结果表明,添加Ce以后,催化剂的低温脱硝活性得到明显提高,在空速6000 h-1时,120℃下NO转化率由71.1%提高到97.8%,并且在120-240℃范围内, NO的转化率均保持在95%以上. Ce改性后催化剂具有较大的比表面积和孔体积；催化剂表面含有更高含量的Mn4＋和较多的表面化学吸附氧,增加了NH3的吸附能力,并进一步促进了NO氧化活性,使SCR活性显著提高.
Cordierite monolithic catalysts were prepared firstly by sol-gel method for TiO2/cordierite, then by impregnation method for Mn-Ce/TiO2/cordierite monolithic catalyst and used for low-temperature selective catalytic reduction（ SCR） of NOx with ammonia. The results indicated that the activity of catalysts significantly improved after Ce doping. The conversion of NO could be improved by doping Ce from 71. 1% to 97. 6% at 120 ℃ with a gas hourly space velocity（ GHSV） of 6000 h-1 . The catalyst of adding proper Ce had larger spe-cific surface area and pore volume. The XPS, NH3 adsorption and NO oxidation tests showed that the catalyst of adding proper Ce contained higher levels of Mn4＋ and more chemical adsorption oxygen, which promoted NH3 adsorption and NO oxidation activity. These factors may lead to the increasing of the SCR activity on Mn-Ce/TiO2/CC catalyst.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第3期589-595,共7页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21073131,21177136)
山西省国际合作项目(批准号:2012081019)
中国科学院战略性先导科技专项(批准号:XDA07030300)资助~~
关键词
低温脱硝
选择性催化还原
堇青石
铈
二氧化钛
Low temperature NOx reduction
Selective catalytic reduction（SCR）
Cordierite
Cerium
TiO2
