摘要
考察了不同负载量的Ni/H-USY(ultra stable Yzeolite)催化剂在氧气含量5%情况下甲烷选择性催化还原氮氧化物性能,同时考察了添加微量Pd和Pt对15%(质量分数)Ni催化剂性能的影响.结果表明,催化剂的催化活性与活性组分的含量间存在密切关系,具有一个最佳的负载量.Pd、Pt的添加提高了氮氧化物的去除率,拓宽了反应活化温度的窗口,同时具有较强的抑制N2O生成的能力.此外采用XRD、TPR等技术对Ni/H-USY体系催化剂的物相结构及氧化还原性能进行了研究,初步探讨了催化剂的催化活性与活性中心的大小与分布之间的关系.
Selective catalytic reduction （SCR） of NOx by CH4 over Ni/H-USY of different Ni loading and trace Pd and Pt elements used to improve the activity of a Ni/H-USY catalyst in the excess of 5% oxygen was investigated. Compared with Ni/H-USY, the Ni-Pd/H USY and Ni-Pt/H-USY catalysts showed higher activity in a wide range of reactive temperature. A synergistic effect between Ni/H-USY and Pd element or Pt element enhanced the conversion of NOx. Samples of the catalysts were characterized with TPR, X-ray diffraction （XRD）. The addition of Pd might be responsible for the higher activity because it can produce a highly dispersed active surface area as bound-state Ni species.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第2期306-310,共5页
CIESC Journal
基金
国家自然科学基金项目(20476095).~~
