论文部分内容阅读
用ＸＲＤ、ＴＰＲ及固定床微反应器技术研究了微量Ｐｔ 和Ｐｄ 对Ｆｅ２Ｏ３／ＺｒＯ２ 催化剂结构及性能的影响。结果表明，活性组分Ｆｅ３ ＋ 与载体ＺｒＯ２ 之间的相互作用会阻止载体从无定形ＺｒＯ２ 到ｔ－ＺｒＯ２ 进而ｍ － ＺｒＯ２ 的转变，同时，促进Ｆｅ２Ｏ３ 在ＺｒＯ２ 表面的分散。微量Ｐｔ 或Ｐｄ 的加入对Ｆｅ２Ｏ３ 在ＺｒＯ２ 上的分散状态无明显影响，但使Ｆｅ２Ｏ３／ＺｒＯ２ 的还原性能发生明显变化，表层Ｆｅ２Ｏ３ 的还原性显著增强，导致Ｍ－ Ｆｅ２Ｏ３／ＺｒＯ２ 催化剂在ＮＯ＋ ＣＯ反应中有更高的催化活性。Ｎ２ 生成的选择性次序为Ｆｅ２Ｏ３／ＺｒＯ２ ＞ Ｐｄ － Ｆｅ２Ｏ３／ＺｒＯ２ ＞ Ｐｔ－ Ｆｅ２Ｏ３／ＺｒＯ２ ＞ Ｐｄ／ＺｒＯ２ ＞ Ｐｔ／ＺｒＯ２ 。
The effects of trace Pt and Pd on the structure and properties of Fe2O3 / ZrO2 catalysts were investigated by XRD, TPR and fixed bed microreactor technology. The results show that the interaction between the active component Fe3 + and the supporter ZrO2 can prevent the carrier from changing from amorphous ZrO2 to t - ZrO2 and then m - ZrO2, and promote the dispersion of Fe2O3 on the surface of ZrO2. The addition of trace Pt or Pd has no obvious effect on the dispersion state of Fe2O3 on ZrO2, but the reduction performance of Fe2O3 / ZrO2 obviously changes and the reduction of surface Fe2O3 is obviously enhanced, resulting in the reaction of M-Fe2O3 / ZrO2 in NO + CO reaction A higher catalytic activity. The selectivity order of N2 generation is Fe2O3 / ZrO2> Pd - Fe2O3 / ZrO2> Pt - Fe2O3 / ZrO2> Pd / ZrO2> Pt / ZrO2.