Palladium exsolution and dissolution with lanthanum ferrite perovskite oxides
Palladium exsolution and dissolution with lanthanum ferrite perovskite oxides
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DOI：
10.1007/s10853-023-08346-1
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发表时间：
2023-03
影响因子：
4.5
通讯作者：
Seyed Morteza Taghavi Kouzehkanan;Jong-Eun Hong;T. Oh
中科院分区：
文献类型：
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作者：
Seyed Morteza Taghavi Kouzehkanan;Jong-Eun Hong;T. Oh
金属出溶催化剂因其独特的抗粗化、抗结焦等性能而受到催化研究者的关注。我们仔细检查了热处理粉末的X射线衍射图，以了解ABO 3钙钛矿氧化物镧铁氧体（LFO）的钯出溶/溶解。选择A位点全组成，B位点上仅具有Fe和Pd，以测试可逆性。我们将Fe 2 O3添加到Pd掺杂的LFO中以检查其对可逆性的影响。Fe_2O_3的加入并不促进Pd的出溶或改变Pd出溶/溶解的可逆性。在800 °C下观察到出溶的Pd完全溶解到Fe基质中，表明来自LFO的Pd出溶是表面现象。Pd在空气中溶解到A位全铁酸镧中，表明Fe 2 O3的出现。然而，这种Fe 2 O3的形成只能在一定的温度范围内看到。
Metal exsolution catalyst has gained interest from catalysis researchers due to the unique properties such as coarsening resistance and coking resistance. We closely inspected X-ray diffraction patterns from thermally treated powders to understand the palladium exsolution/dissolution with an ABO3perovskite oxide, lanthanum ferrite (LFO). A-site full composition was chosen with only Fe and Pd on the B-sites to test the reversibility. We added Fe2O3to the Pd-doped LFO to check its impact on reversibility. The addition of Fe2O3did not facilitate Pd exsolution or alter the reversibility of the Pd exsolution/dissolution. A complete dissolution of exsolved Pd into the Fe matrix was observed at 800 °C, suggesting Pd exsolution from LFO is a surface phenomenon. The Pd dissolution into A-site full lanthanum ferrite in the air showed the emergence of Fe2O3. However, this Fe2O3formation can be seen only in a certain temperature range.