摘要
采用共沉淀-浸渍法制备了Mn/Co-Ba-Al-O催化剂.考察了用共沉淀法制作载体Co-Ba-Al-O过程中加料顺序分别为正加法、反加法和并流法时催化剂的活性.BET测试和XRD分析表明,并流时制得的载体比表面积最大,且其中的γ-Al2O3结晶度最好,不含BaCO3,对NO的催化氧化性能最好.考察了各操作条件对并流法制备的催化剂催化氧化NO效率的影响,结果显示,在NO体积分数为500×10^-6,O2体积分数为10%,空速为4000h^-1时,225℃左右,出口NOx的氧化度（NO2/NOx）达到50%-60%,将取得最大的吸收效率;300℃时,氧化度可达到83%左右,接近热力学平衡值.
Mn/Co-Ba-Al-O catalyst was prepared by coprecipitation and impregnation. The effect of precipitation methods of preparing Co-Ba-Al-O carrier, including normal, reverse and parallel-flow precipitation methods, on the activity of the catalyst was investigated. The results of BET testing and XRD analysis show that the parallel-flow precipitation method is the best way to obtain the most effective carrier. In this case, the surface area of the carrier is much larger than that of the other two products, and the γ-Al2 O3 has the best crystallinity. BaCO3 does not exist in the carrier. The effect of the catalyst prepared by parallel-flow precipitation method on catalytic oxidation of nitric oxide depends on such factors as space velocity, temperature and volume fraction of NO and O2. When the volume fraction of feeding NO is 500 ×10^-6, O2 10%, space velocity 4000 h ^- 1, the rate of oxidation reached 50% -60% at 225℃, and the highest absorption efficiency is gained. At a temperature of 300℃, the rate of oxidation is about 83%, almost equal to the thermodynamic equilibrium value.
出处
《环境科学学报》
CAS
CSCD
北大核心
2007年第11期1793-1798,共6页
Acta Scientiae Circumstantiae
作者简介
莫建红（1982-），女，硕士研究生，E-mail：mjh_xtu00@yahoo．com．cn；
通讯作者（责任作者），E-mail：tzq@xtu．edu．cn责任作者简介：童志权（1942-），男，教授，博士生导师，享受国务院特殊津贴专家．主要从事大气污染控制新技术的研究．E-mail：tzq@xtu．edu．cn．
