中文摘要：

考察了不同负载量的Ni／H—USY（ultra stable Y zeolite）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N：O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．

英文摘要：

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.