摘要
催化燃烧是提高效率,降低热NO_x污染的有效方法,要求活性组分及其载体具有良好的抗烧结性。这可通过在Al_2O_3中引入碱土金属离子组成层状结构的六铝酸盐来实现。以La^(3+)取代部分碱土离子(如Ba^(2+)等),能更容易获取纯净的六铝酸盐,而以Mn^(2+)取代部分Al^(3+),既可提高甲烷完全燃烧的活性,又增进了催化剂的高温热稳定性,再结合制备方法的改进,氧化铝载体及其活性组分的高温性能会得到显著改善。
Catalytic combustion is an effective method to increase combustion efficiency and reduce NOx thermal pollution. It demands that the active constituents and their supports have excellent sintering resistance, which can be achieved by introducing alkaline-earth metal ions (Ba2+, Sr2+ etc. ) into A12O3 to form hexaaluminate with layer structure. When alkaline earth metal ions are partially substituted with La3+ , it is easier to obtain pure such as Ba2+ hexaaluminate , but when A13+ are partially substituted with Mn2+,it will enhance not only the catalyst's activity for methane combustion, but also its thermal stability. If it is combined with an improvement on the manufacturing method,the high temperature performance of the alumina support and the active constituents will be considerably improved.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
1996年第4期24-27,共4页
Natural Gas Chemical Industry
基金
国家自然科学基金资助项目
关键词
催化燃烧
热稳定性
锰
镧
甲烷
六铝酸盐
catalytic combustion,thermal stability,rare earth-based hexaaluminate,Mn-modified alumina
