Ni/H-USY催化剂上甲烷选择性催化还原NOx的性能

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 of nitrogen oxides by methane over Ni/H-USY catalysts

Selective catalytic reduction(SCR) of NO_x by CH_4 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 NO_x. 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.