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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.