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首页> 外文期刊>Catalysis science & technology >Self-regeneration of three-way catalyst rhodium supported on La-containing ZrO2 in an oxidative atmosphere
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Self-regeneration of three-way catalyst rhodium supported on La-containing ZrO2 in an oxidative atmosphere

机译：在氧化气氛中支持含LA的ZRO2的三向催化剂若i的自我再生

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Rhodium supported on lanthanoid (La, Ce, Pr, or Nd)-containing ZrO2 was investigated as a three-way catalyst following an aging treatment (oxidation at 1273 K) that simulates 80 000 km of mileage In real vehicles. The properties of rhodium were assessed by transmission electron microscopy, CO chemisorption, and temperature-programmed reduction using CO. The oxidation states of rhodium before and after the aging treatment were evaluated using X-ray photoelectron spectroscopy. Rhodium supported on lanthanum-containing ZrO2 (Rh/Zr-La-O) was highly active for the removal of NO_x and hydrocarbons from a synthetic auto exhaust. The support determined the oxidation state of rhodium after the aging treatment: rhodium supported on Zr-La-O maintained its low oxidation state during the three-way catalytic reaction and after the aging treatment, whereas rhodium supported on ZrO2 and other lanthanoid-containing ZrO2 was converted to the higher oxidation states. The Rh/Zr-La-O catalyst, following the aging treatment, exhibited superior activity for the steam reforming reaction. The hydrogen produced from the steam reforming reaction reduced the previously oxidized Rh in Rh/Zr-La-O, thereby regenerating the catalyst that was previously deactivated by an oxidation treatment. Self-regeneration of the Rh/Zr-La-O catalyst by the steam reforming reaction was more efficient when compared with that of the other lanthanoid-containing ZrO2 catalysts. These results highlight the potential of the present strategy for developing active three-way catalysts with high tolerance to oxidative conditions.
机译：在衰老治疗（1273 K时氧化）之后，研究了含腺苷酸（LA，CE，PR或ND）支持的lande液（LA，CE，PR或ND），以三向催化剂的形式模拟了实际车辆中的80 000 km里程。使用CO通过透射电子显微镜，CO化学吸附和温度绘制的降低来评估菱形的性质。使用X射线光电子光谱法评估了老化处理前后的若度态的氧化态。支持含腺瘤的ZRO2（RH/ZR-LA-O）支持的若i位高度活跃，可从合成自动排气中去除NO_X和碳氢化合物。支持确定了衰老治疗后的铑的氧化态：在ZR-LA-O支撑的铑在三向催化反应和衰老治疗后保持其低氧化态，而在ZRO2和其他含Lanthanoid的ZRO2的hodium则维持其氧化态。被转化为较高的氧化态。衰老治疗后，RH/ZR-LA-LA-O催化剂对蒸汽重整反应表现出优异的活性。由蒸汽重整反应产生的氢降低了先前在RH/ZR-LA-O中氧化的RH，从而再生以前通过氧化处理停用的催化剂。与其他含Lanthanoid的Zro2催化剂相比，蒸汽重整反应对RH/ZR-LA-O催化剂的自我再生更有效。这些结果突出了本策略对氧化条件耐受性高的活性三向催化剂的潜力。

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